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Message started by Sosacj21 on 08/14/17 at 18:48:00

Title: Running on PRI
Post by Sosacj21 on 08/14/17 at 18:48:00

is it bad for this bike to run on PRI and just turn it to ON when it's parked???

Title: Re: Running on PRI
Post by justin_o_guy2 on 08/14/17 at 20:54:29

On Prime you have No reserve.
Why do you want to do that?

Title: Re: Running on PRI
Post by IslandRoad on 08/14/17 at 21:10:06

Imagine running out of gas in the middle lane of the freeway! The bike will literally just die right there under you. Even if the reserve won't get you to the next pitstop, it will at least get you to a safe place to run out of gas.

Title: Re: Running on PRI
Post by Sosacj21 on 08/14/17 at 21:25:13

So I installed an aftermarket exhaust and took my bike to up the jets. Mechanic went up to a 155 on main jet and said the pilot was good at stock but bike seemed to want to die out so his suggestion was that the peacock wasn't allowing enough gas to get through so to try and run it on PRI and when I did it ran great and very little backfire like it had been before

Title: Re: Running on PRI
Post by Sosacj21 on 08/14/17 at 21:29:37

I'm not much of a mechanic myself but I kind of wondered if going up on the pilot jet may help??

Title: Re: Running on PRI
Post by IslandRoad on 08/14/17 at 22:15:10

If you have the stock petcock, it sounds like you have a very common problem for this bike - the stock petcock is known to fail. You can replace it with a genuine Yamaha petcock for the Raptor 660. It's manually operated but is reliable.

Running on prime won't hurt the bike. But if your carb float sticks then there is no way to turn the fuel off. It'll fill up your carb with fuel, run into your air-box, and possibly your engine.

The Raptor petcock is inexpensive and takes about 15 minutes to install. Just 2 screws.

One last question. Are you running an inline fuel filter? If so, it's not necessary and some people have problems with them.

Title: Re: Running on PRI
Post by Dave on 08/15/17 at 04:18:18

If you are running the stock air filter....a #155 main is too big - a #150 is plenty. For the pilot jet you should only need a #50 or #52.5 if you live below 1,000' msl....if you live up in the mountains it may require a #47.5.

It sounds like the stock vacuum operated petcock is failing, and it is not opening and allowing enough fuel to reach the carb. And as stated previously, inline fuel filters can get air bubbles in them that block the flow of fuel.

Title: Re: Running on PRI
Post by Sosacj21 on 08/15/17 at 04:18:46

What makes it weird is the bike is a 2017 with only 900 miles so when the mechanic said that same thing about the petcock not working properly it tripped me out. So yea I am running everything stock except for the Jardine Slip on that I put on

Title: Re: Running on PRI
Post by IslandRoad on 08/15/17 at 04:27:49

Suzuki have been making the same bike for 30 years. The petcock can fail on a 2017 too!

724E5240424B1310210 wrote:

Title: Re: Running on PRI
Post by IslandRoad on 08/15/17 at 04:28:27

Mine's a 2016 and I had to change the petcock at about 2k.

Title: Re: Running on PRI
Post by Sosacj21 on 08/15/17 at 04:32:13

So my best bet is to replace the petcock with a raptor? Also what are things to look for to tell if the #155 main jet is to big?

Title: Re: Running on PRI
Post by Dave on 08/15/17 at 05:04:18

1D213D2F2D247C7F4E0 wrote:

Also what are things to look for to tell if the #155 main jet is to big?

Poor fuel mileage, sooty exhaust, carbon build up on the spark plug.

If you apply full throttle in high gear and get the bike accelerating and pulling hard in the upper rpm's....slowly roll off the throttle and pay attention to what the engine is doing as you just begin to let off full throttle....if the bike runs smoother and feels like it runs better for a brief moment - that is an indication the main jet is too big.

Title: Re: Running on PRI
Post by justin_o_guy2 on 08/15/17 at 08:23:27

So yea I am running everything stock except for the Jardine Slip on that I put on

Getting the right mix of fuel and air demands that the system be balanced.
Suddenly allowing exhaust to be virtually unrestricted creates a lean condition.

If it runs better on prime you have something going on petcock related.

If the vacuum can't open it up to flow enough to run it, that's screwy.

The petcock is a known issue and it's a variable. For about thirty bucks you can streamline the problem solving.

There are smart carburetor guys here, who can tell you what clues to look for, throttle settings, flat spots or power surges, etc.

If I thought it was lean I'd get rolling and cruising at steady speed, and click the choke a click.

Title: Re: Running on PRI
Post by Sosacj21 on 08/15/17 at 09:19:06

Getting the right mix of fuel and air demands that the system be balanced.
Suddenly allowing exhaust to be virtually unrestricted creates a lean condition.

If it runs better on prime you have something going on petcock related.

If the vacuum can't open it up to flow enough to run it, that's screwy.

The petcock is a known issue and it's a variable. For about thirty bucks you can streamline the problem solving.

There are smart carburetor guys here, who can tell you what clues to look for, throttle settings, flat spots or power surges, etc.

If I thought it was lean I'd get rolling and cruising at steady speed, and click the choke a click.

Without a doubt you guys know what you're doing that's why I'm on here. I knew it was running super lean so I took it in and had a mechanic try two deifferent size jets and he felt the #155 main was a lot better than the #152.5 main. As for the pilot he said it was good at #52.5 so when I took it for a run it did sputter on lower and still was backfiring and eventually shut off after downshifting and trying to pick back up from first. He then tried switching it to prime because he thought the petcock wasn't allowing enough flow and once he did that it runs good and backfiring is small

Title: Re: Running on PRI
Post by justin_o_guy2 on 08/15/17 at 09:53:44

Ditch the petcock.
A low idle will make it die after a quick throttle chop. A low idle is generally just bad news.

Title: Re: Running on PRI
Post by Sosacj21 on 08/15/17 at 11:36:22

Ditch the petcock.
A low idle will make it die after a quick throttle chop. A low idle is generally just bad news.

Ok so go with the Raptor 660?

Title: Re: Running on PRI
Post by pam on 08/15/17 at 12:46:29

I bought a brand new 2015..only 2 miles on it...did the same thing..replaced with the raptor... actually Dave, the Moderator here replaced it... in truth. The bike has ran great afterwards... no problems..i have not done the jets yet. i only have a slight back fire as of now..when i go to shut it off..but other wise has never died on me once at all.... Change to the Raptor petcock... you will be a Happy Man.... Pam :)

Title: Re: Running on PRI
Post by Sosacj21 on 08/15/17 at 14:07:26

Title: Re: Running on PRI
Post by Steve H on 08/15/17 at 15:27:02

It'll be at least as good as running on prime. Prime is intended to fill the carb when the bowl is dry for whatever reason. I am not sure if it flows as much fuel as the raptor will when it's in on or reserve position. Plus, you have the option on the petcock of turning off the fuel.

Low idle will also result in low oil flow to the head and hasten the wear on the cam and possibly the rockers. Idle should be at 1,000 to 1,100. 9 to 10 mph in first gear on flat land. The cam rides in align bored aluminum. No steel inserts. It needs plenty of lube.

Read the oil wars for the best recommended oils for this bike. This is old, outdated technology. Just because it says for motorcycles doesn't mean it's right for this bike.

Title: Re: Running on PRI
Post by justin_o_guy2 on 08/15/17 at 17:07:18

5E627E6C6E673F3C0D0 wrote:

What did you spend?

Title: Re: Running on PRI
Post by Sosacj21 on 08/15/17 at 17:20:24

What did you spend?

$7.00 off Amazon

Title: Re: Running on PRI
Post by IslandRoad on 08/15/17 at 17:54:41

65594557555C0407360 wrote:

What did you spend?

$7.00 off Amazon

That's very cheap. Are you sure it's a genuine Yamaha one? At that price it sounds like a cheap knock-off. Those can cause more problems. Also, the specs on the cheap ones don't always match the genuine (different sized ports, and things like that).

Title: Re: Running on PRI
Post by Sosacj21 on 08/15/17 at 18:14:38

I searched the part on Amazon and the most expensive one I seen was $12. They all say Yamaha Raptor 660 petcock fuel valve

Title: Re: Running on PRI
Post by Sosacj21 on 08/15/17 at 18:21:29

Should I just go and find a new OEM Raptor?

Title: Re: Running on PRI
Post by justin_o_guy2 on 08/15/17 at 20:32:22

If you buy a twelve dollar one, just throw it away.

Title: Re: Running on PRI
Post by IslandRoad on 08/15/17 at 20:52:18

Expect to pay about 30 bucks for a genuine one - worth every dollar

Title: Re: Running on PRI
Post by IslandRoad on 08/15/17 at 21:17:57

Try searching by the part number: 5LP-24500-01-00. You might have more luck.

Like this one: https://www.ebay.com/p/Fuel-Gas-Tank-Petcock-Turn-Valve-thingy-OEM-Yamaha-Raptor-YFM660R-YFM-660R-660-R/1023314198

Title: Re: Running on PRI
Post by justin_o_guy2 on 08/15/17 at 21:24:54

Why is just calling the local Yamaha dealership so hard?

Title: Re: Running on PRI
Post by Sosacj21 on 08/16/17 at 18:31:36

Thanks guys for all the help. Ordered the OEM Raptor 660. Should be getting it Tuesday. On another note today noticed with my petcock on Prime that on decel with first or second gear that it Started sputtering a little and had some popping on upshifting from first to 2nd. Is this a sign a may need to go up a size on my pilot jet?

Title: Re: Running on PRI
Post by justin_o_guy2 on 08/16/17 at 18:48:08

Start by checking the header bolts and the header / muffler connection.
Leaks make backfires.

Title: Re: Running on PRI
Post by IslandRoad on 08/16/17 at 19:05:55

I wouldn't bother with the pilot jet until you have the Raptor installed or you'll end up chasing your tail.

Title: Re: Running on PRI
Post by Sosacj21 on 08/16/17 at 19:35:19

Start by checking the header bolts and the header / muffler connection.
Leaks make backfires

I have checked it before but I will do a double check

Title: Re: Running on PRI
Post by Sosacj21 on 08/16/17 at 19:38:49

I wouldn't bother with the pilot jet until you have the Raptor installed or you'll end up chasing your tail.

Thanks for the heads up. I didn't even think about that. I'm about 5 months into riding so I'm definitely still learning what and what not to do

Title: Re: Running on PRI
Post by Sosacj21 on 08/20/17 at 14:39:33

What's up guys just an update just installed the Raptor petcock but accidentally left my lights on yesterday so my battery is dead. Gonna try and charge it up and take the bike for a ride then I'll let you know how it rides

Title: Re: Running on PRI
Post by IslandRoad on 08/20/17 at 14:44:54

Good luck ;)

Title: Re: Running on PRI
Post by Sosacj21 on 08/20/17 at 14:48:56

Btw when refilling my gas tank I accidentally spilled onto the bike engine area. Any major problems that I could have caused?

Title: Re: Running on PRI
Post by justin_o_guy2 on 08/20/17 at 14:56:43

714D514341481013220 wrote:

Turn the key off. Leave the kill switch for later, After reaching for the key becomes second nature.

Title: Re: Running on PRI
Post by IslandRoad on 08/20/17 at 16:54:29

Or, just never use the kill switch ... unless you're throttle sticks, or you drop the bike!

Title: Re: Running on PRI
Post by ohiomoto on 08/21/17 at 04:00:43

5864786A6861393A0B0 wrote:

Btw when refilling my gas tank I accidentally spilled onto the bike engine area. Any major problems that I could have caused?

-----------------------------------------

Besides fire? no.

Title: Re: Running on PRI
Post by ohiomoto on 08/21/17 at 04:00:57

5E59585E5C5E455E310 wrote:

[quote author=5864786A6861393A0B0 link=1502761680/30#35 date=1503265736]Btw when refilling my gas tank I accidentally spilled onto the bike engine area. Any major problems that I could have caused?

-----------------------------------------

Besides fire? No.[/quote]

Title: Re: Running on PRI
Post by Sosacj21 on 08/21/17 at 09:10:54

Was able to ride bike today on way to work with raptor petcock in place and bike felt good and backfire went to a minimal just a few times shifting from 2nd to 3rd. The only issue I felt was when I was cruising and holding throttle steady at about 20mph in the parking lot the bike would sputter don't know what that could be? Also haven't needed to use the choke to start the bike after sitting overnight, also don't know if that is good or bad? Bike info- 2017 Ls650 just hit 1,000 miles with a Jardine slip on. Main jet is currently at #155 and pilot at stock 52.5 with white spacer still in

Title: Re: Running on PRI
Post by justin_o_guy2 on 08/21/17 at 11:44:18

If you have added a fuel filter, ditch it.

Title: Re: Running on PRI
Post by Sosacj21 on 08/21/17 at 11:46:40

If you have added a fuel filter, ditch it

No fuel filter added. Everything is stock other then the slip on

Title: Re: Running on PRI
Post by justin_o_guy2 on 08/21/17 at 13:13:05

What gear at twenty? That's revved up fair first or kinda dogging second, if it's not level. Much uphill at twenty in second is harsh.

Title: Re: Running on PRI
Post by Sosacj21 on 08/21/17 at 13:40:08

What gear at twenty? That's revved up fair first or kinda dogging second, if it's not level. Much uphill at twenty in second is harsh.

At twenty I was in second gear. Am I shifting to soon???

Title: Re: Running on PRI
Post by justin_o_guy2 on 08/21/17 at 13:44:09

If it's coughing in second at twenty on level ground, something probably isn't perfect, but I would play with it at cruising RPM before I got too worked up.

Title: Re: Running on PRI
Post by batman on 08/21/17 at 21:49:08

I think you might be shifting to soon you should be shifting closer to 30.

Title: Re: Running on PRI
Post by Sosacj21 on 08/25/17 at 18:50:40

Another update. So tested out lower gear riding all week and tested the cruising steady at about 15-20mph in 1st and I'm still sputtering but gears 3-5 feel good. Still getting some popping on upshifting from first to 2nd and 2nd to 3rd but nothing on decel. Also noticed the jardine is starting to turn bluish and brown which is spitting out a blue flame on shutdown and the main pipe closer to the header is getting a little gold tint. Any suggestions on what could be going on? Also I'm planing to ride down the coast about 100 miles each way in a couple days, from what I described am I good to do so?

Title: Re: Running on PRI
Post by twhitus on 08/25/17 at 20:16:08

not for nothing but that slight bucking your getting at lower cruising speeds was a issue that i had and drove me nuts. as was suggested on another forum post i found a gas station that sold non-ethanol gas and tried a full tank of that. low speed bucking is gone and the after fire/popping in the muffler was lessened.
i had to do a google search for non ethanol fuel stations, the one i buy at now has it marked as "recreational fuel" at about 50cents/gallon more. it runs so much better its worth it.

Title: Re: Running on PRI
Post by Sosacj21 on 08/26/17 at 12:08:29

Title: Re: Running on PRI
Post by IslandRoad on 08/26/17 at 14:00:29

427E6270727B2320110 wrote:

I've had the same experience here in Australia. Our fuel is not blended by default, but 10% ethanol (E10) is available in some places. I spent ages tuning my carb after re-jetting and the spacer mod. Finally had it running beautifully. Then I stopped at a gas station that sells E10. I filled up with (supposedly) straight fuel. As soon as I left that place the bike felt like all the carb tuning had been undone, I had that surge back. I've been there a couple of times with the same result.

That gas station is really convenient because it's on the way out of town, but I never use it. I now keep a fuel can at home, with fuel I know is good, and I just fill up before I go.

Title: Re: Running on PRI
Post by Sosacj21 on 09/13/17 at 05:32:22

What's up guys been a little bit but got an update. Started using 87 gas for a couple weeks now and the sputtering has definitely decreased a lot when cruising in lower gears. Still have some loud popping issues when upshifting from 1st to 2nd and 2nd to 3rd but have noticed if I really rev up the engine before shifting is tends not to pop anymore. Also still noticing a blue flame shooting out of the exhaust on shutdown. All in all the bike runs and feels good just these little issues but don't know if they are normal or maybe something I need to try and adjust? Again Current set up is a #52.5 pilot jet, #155 main jet, no white spacer mod with a Jardine slip on exhaust and a raptor petcock

Title: Re: Running on PRI
Post by justin_o_guy2 on 09/13/17 at 06:49:40

with a Jardine slip on exhaust

Very tricky to get that set up to not backfire. Any leaks anywhere and it's gonna.

Title: Re: Running on PRI
Post by Sosacj21 on 09/13/17 at 07:58:46

Yea I've noticed its not easy but I have checked for leaks and found none so I'm able to live with it just wanted to make sure it wasn't a sign that I need to make an adjustment somewhere. Im assuming that blue flame on shutdown is also normal though?

Title: Re: Running on PRI
Post by Dave on 09/13/17 at 08:13:29

7F6066617C7B4A7A4A72606C27150 wrote:

with a Jardine slip on exhaust

Very tricky to get that set up to not backfire. Any leaks anywhere and it's gonna.

The more open and unrestricted the exhaust is.......the more prone it will be to being noisy (including unwanted explosions)!

Title: Re: Running on PRI
Post by batman on 09/13/17 at 14:50:06

Most of the time the throttle is only partly open ,you need to brake down and do the spacer mod ,your running lean in the mid throttle (where you spend most of your time)do to your muffler.when you shift from 1st to2nd ,2nd to 3rd ,your rpm is about 3000 to4000 rpm ,but your closing the throttle leaving only the pilot jet to deliver gas to the air coming in,which is only enough to support combustion at 1100 rpm,the sparkplug can't fire the lean mix(the motor misses ) so it then passes on into the exhaust header where the heat causes it to explode (backfire and /or flames shooting out the muffler)then you reopen the throttle and the mix recovers from lean and the power returns .Doing the needle lift should make a lot of your problems lessen/ disappear.

Title: Re: Running on PRI
Post by Sosacj21 on 09/14/17 at 09:49:23

Ok cool thanks for that info I'll make sure to get this spacer mod done as soon as possible. What size washers again and how many do you think I should use?

Title: Re: Running on PRI
Post by batman on 09/14/17 at 10:10:16

#4 steel machine washers How many to use would depend on your elevation ,usually 3 if your above 1000ft ,2 if your below or near sea level. you may have to use 2 because of your more open muffler.

Title: Re: Running on PRI
Post by Sosacj21 on 09/14/17 at 15:01:41

I live in Southern California so pretty much right at sea level. I'll go with the two washers and test it out to see how that feels