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Message started by hotrod on 07/05/18 at 17:26:06

Title: Raptor petcock
Post by hotrod on 07/05/18 at 17:26:06

Stock carb re-jetted. No air box. Have the Raptor petcock. After switching to reserve, about 12 miles later.....I'm walking. Is that about right ?

Title: Re: Raptor petcock
Post by JAGGUY on 07/05/18 at 17:38:16

I just finished reading the Raptor install thread and it said:
The reserve provided by the Factory Petcock is larger than the reserve provided by the Raptor. The difference is caused by the height of the tube that provides flow to the ON position. This could be corrected by removing the filter and extending the height of the tube on the Raptor - which may be a subject of a future tech article. I turned each petcock to ON and let the fuel run out - then switched the petcock to RES and let the fuel run out and measured what was in the bottle. The stock petcock provides 78 oz of fuel, while the Raptor provides 60 oz of fuel on RESERVE - this is whitout shaking the bike to get any remaining fuel out of the right side of the tank and you may get more when actually riding. If you got 55 MPG on your bike the stock petcock provides 33.5 miles of reserve and the Raptor provides 25.7 miles of reserve.

Of course YMMV!

Title: Re: Raptor petcock
Post by elricfate on 07/06/18 at 04:36:17

In otherwords, depending on your weight, your riding style, your elevation, the degree of the grade you're on, etc...

Yes, it could be accurate. If you plan on running it to fumes and kicking it over to Reserve before topping it off, I would also plan on running a spare bottle in a bag.

An 18/8 stainless bottle with a nitrile o-ring (buna-n) will do the trick just as well as anything else, so long as the threads for the cap are coarse and the plastic is durable.

Title: Re: Raptor petcock
Post by ohiomoto on 07/06/18 at 07:17:05

Re-jetted, no airbox??? Let me guess, 55 pilot and 155 main jets?? If so, you're probably getting 30 mpg. Have you ever checked it?

When I got my bike secondhand, it had those jets with a stock airbox and Dyna muffler. It sounded "cool" but was a turd and spewed wet soot all over my rear brake arm. MPG was in the 30s with my 6'3", 250 lb frame on it and it would barely do 80 mph downhill. The bike also had an air leak at the exhaust header/muffler juncture and popped/backfired a good bit during deceleration and shutdown.

I fixed the exhaust leak and dropped down to near stock jetting (I think one size up on each if I recall). I can short shift the bike as fast as I can work the levers through all five gears in any part of the power band and I'm consistently averaging 50 MPG. It does feel a little flat on top if I try to stretch gears compared to the overly rich setting, but it gets there way faster and gets to 80 mph with ease before it abruptly flattens out. Bike hardly ever pops on deceleration and just a light to medium poof at shutdown.

[RANT]
My take on this is that while every bike and environment is different, I believe the common jetting advise on this forum is probably leaning towards too rich. I think people have focused too much on sound instead of focusing on performance and have overlooked other contributing factors.

For example, you say no airbox. Some would assume that means you need to make a jetting adjustment to compensate for the increased air. Not always. If you put a pod filter on there, there is a good chance it's more restrictive than the stock airbox. In addition, it could be covering one of the air passaged at the back of the carb. Or, possibly your bike was already rich and would benefit from being leaner, but you end up going richer instead.

I can't answer those questions for you, but nearly all the advise thrown around here is make it richer and that's just not always true.

Not everything you read on the internet is true.
[/end RANT]

Of course, your jetting could be spot on for your needs. Your bike might be running perfectly. I don't know. Just offering up an opinion that may or may not help.

Title: Re: Raptor petcock
Post by Gary_in_NJ on 07/06/18 at 07:51:35

I adjusted the height (length?) of the main and reserve tubes to suit my purposes.

Title: Re: Raptor petcock
Post by norm92de on 07/06/18 at 09:18:25

I tested my raptor petcock reserve range.

Carrying a small container of extra gas I ran my bike dry and it got me 27 miles to a dry tank. When on reserve I ride in the fuel conservation mode for obvious reasons and of course on the freeway it would be less than around town. The petcock is un-modified, just as Yamaha deigned it.

I figure that ridden cautiously my bike consumes 2oz per mile.

Title: Re: Raptor petcock
Post by hotrod on 07/06/18 at 13:26:15

ohiomoto ; you guessed right on my jetting, except the main jet is 152.5 There are things you mention that I will take a second look at. The K-N cone filter is not blocking the intake holes. I'm using a 6 inch pvc pipe between the filter and the stock rubber intake.

Title: Re: Raptor petcock
Post by Dave on 07/07/18 at 04:11:16

OHIOMOTO:

I agree with your rant......although I only have experience with bikes that use the stock airbox and paper filter, and the stock, Dyna or Supertrapp muffler (no open drag pipes).

I ride at 500' - 800' above sea level, and using an oxygen sensor and fuel/air ratio meter.....the bikes have always run best with a #150 main jet. The pilot can be either a #50 or #52.5....and most bike like 3 washers on the needle (while the 2007 bike needed only 2 washers to get rid of the low throttle lean surge). About half of the stock bikes I have ridden showed the lean stumble at low throttle settings.

If you ride at higher elevations.....I believe that even the 147.5 main jet may be appropriate - although you may benefit from the removal of the white spacer on the needle and the use of washers to richen up the low throttle lean condition.

Title: Re: Raptor petcock
Post by DragBikeMike on 07/07/18 at 10:53:42

What sort of ratio are you shooting for Dave? Does your O2 sensor and gage give you a reading expressed as a ratio (14:1, 13.7:1, etc.) If so, what ratio do you feel performs best for your needs?

Where did you get the instrument? Who makes it? How hard was it to install? Where did you locate the sensor, in header pipe or muffler?

Title: Re: Raptor petcock
Post by batman on 07/07/18 at 14:53:44

I have to agree with Dave , my motor has a tuned intake runner and a Dyna muffler ,but is internally stock . My elevation is 1300 ft but with the 150 main jet I often run between 400 and 2500 ft with seemingly no change in performance . Smaller jets made the motor surge at low throttle,larger jets didn't increase performance and hurt mpg .I run a stock 52.5 pilot and 3 washers on the needle.

Title: Re: Raptor petcock
Post by norm92de on 07/07/18 at 16:16:20

How thick are the #4 washers?

Title: Re: Raptor petcock
Post by madmikesmech on 07/09/18 at 11:57:35

49727F6879756E68737B76691A0 wrote:

Dave, the majority of my riding is done at about 1300 - 1600 feet above sea level, with a Jardine turnout pipe (minimal bafgle or restriction) what is a good jet combo in your opinion?