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Help! My bike wont run! (Read 147 times)
MrMangoTime
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Re: Help! My bike wont run!
Reply #15 - 10/30/24 at 18:20:59
 
ohiomoto wrote on 10/30/24 at 17:30:45:
Sounds like a bad petcock to me.


No its not the petcock. I've checked and double checked it. It runs off of engine vacuum and on prime just fine. and the carb is getting plenty of gas.
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ThumperPaul
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Re: Help! My bike wont run!
Reply #16 - 10/31/24 at 05:11:20
 
A good thorough cleaning never hurts as long as you can get it all put back together correctly.  If you use the dip bath method, make sure you remove all the o-rings and rubber parts (diaphragm and TEV diaphragm).

Good diagram of the carb in post #2 —>   http://suzukisavage.com/cgi-bin/YaBB.pl?board=tech;action=display;num=1098869040

Removing Air/Fuel Mix Screw —>  http://suzukisavage.com/cgi-bin/YaBB.pl?num=1350749896/0

If you decide to clean it or not, you have to get that A/F mix screw back in functional condition.
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ThumperPaul
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Re: Help! My bike wont run!
Reply #17 - 10/31/24 at 05:26:51
 
If you decide to make a paperweight out of the stock carb, here’s a post on my trials and tribulations installing the Keihin-style PWK38 —>

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1714330191

A good starting point for the jetting is where I quit tinkering with mine:

Pilot Jet #32
Main Jet #125
E-clip in the middle groove on the needle (it comes this way when you buy it)

The manufacturer installed jets are HUGE.  You can’t use those and you have to buy extra pilot and main jets.  I’ve had good luck with the cheap jet kits you can buy on Amazon.

https://www.amazon.com/gp/aw/d/B07MMJV6BT?psc=1&ref=ppx_pop_mob_b_asin_title
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ThumperPaul
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Re: Help! My bike wont run!
Reply #18 - 10/31/24 at 05:38:14
 
If you decide to go the Mikuni VM36/38 route, Lancer sells a complete kit.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1338654578
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MrMangoTime
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Re: Help! My bike wont run!
Reply #19 - 10/31/24 at 13:52:02
 
[quote author=6D514C54495C4B69584C55390 link=1730160337/15#18 date=1730378294]If you decide to go the Mikuni VM36/38 route, Lancer sells a complete kit.


I was looking around today and saw one of these from Murray Carbs. Heard anything about these kits?

https://murrayscarbs.com/product/suzuki-boulevard-s40-ls650-savage-mikuni-vm36-c
arb-kit/?gad_source=1&gclid=Cj0KCQjw1Yy5BhD-ARIsAI0RbXY8DfmLnRHWErfKA_xCwMC_PTdI
U2CD9L8RQZI2vDQDZ8XoYgTgDaAaAsN9EALw_wcB#reviews
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ThumperPaul
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Re: Help! My bike wont run!
Reply #20 - 10/31/24 at 14:32:48
 
When I had my old S40 with a Mikuni VM36, it was from Murray’s carbs.

His jet set up (tune) is very different than Lancer’s typical recommended set up.  I ended up rejetting using Lancer’s guidance for the main jet and it was much better.  Murray swears by his setup, but the main jet is too lean (#165).  Lancer recommends somewhere between 180-200 depending on exhaust, elevation, etc.  I rejetted to #200 and liked it better.

SurvivingPhilly has a Murray VM36 carb and he also rejetted his with the #200 and liked it better.

Murray can be a crusty old bird when you start asking questions or question his setup.  Defensive you might say.  I probably rubbed him the wrong way too.  He also makes the exposed length of his throttle cables about 1” too long and gets really defensive about that.  He ended up making 3 for me until I got one that was workable (it was the principle of the matter).  He only charged me for 1 (like $15).  That’s a good deal and he custom makes the cables (nice quality).  I was able to modify and shorten the other 2 cables he sent, so I have a couple backups now.

He’s reputable and stands behind his work.  Even if you gotta argue with him a bit.
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ohiomoto
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Re: Help! My bike wont run!
Reply #21 - 10/31/24 at 18:23:50
 
MrMangoTime wrote on 10/30/24 at 18:20:59:
ohiomoto wrote on 10/30/24 at 17:30:45:
Sounds like a bad petcock to me.


No its not the petcock. I've checked and double checked it. It runs off of engine vacuum and on prime just fine. and the carb is getting plenty of gas.

So many words...I must have missed the part where you checked the petcock.  Sorry.
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JOG
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Re: Help! My bike wont run!
Reply #22 - 11/01/24 at 00:19:10
 
If you can find a tap the size and thread of the AF screw you might want to chase the threads in the carburetor. If you can't find a Bottom Hole tap, you can cut the taper off of the regular tap. If you can't Find a tap, a bolt with a slot cut into it, with the slot angled such that the deep side of the slot is to the left of the center of the bolt will chase threads. I've got several of those in my collection of taps. The harder the bolt, the better, but the carburetor is soft, so less than Grade 8 would probably be okay.
You can dress up threads on a bolt with a nut strategically sliced through, also.
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ThumperPaul
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Re: Help! My bike wont run!
Reply #23 - 11/01/24 at 12:37:55
 
All I can say is trying to tap it down in that rabbit hole without screwing it up is virtually impossible.  Certainly for me it was…

I wanted to use the Torx bit method described in the Tech post (shared above), but I never got that far.  Taking as many precautions as I thought reasonably necessary, the drill bit decided to take a walk and I “wollered the fak” out of it.  Good bye carb!  I saved all the guts and good stuff and chunked the carb body in the trash!  The End.
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Nianezam
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Re: Help! My bike wont run!
Reply #24 - Yesterday at 14:13:47
 
I rebuilt my S40 (2011) again this week.  STILL will not run without the choke on full.  Driving me nuts!  Petcock replaced, all jets cleaned/replaced, fresh fuel, tried the fuel/air screw from 1.5 to 3 turns.  When I try to ease off the choke, or slightly hit the throttle, it will sputter and die.  I think I might just break down and get a new carb.

So I spoke to Murray and his son-in-law yesterday.  Told him I wanted to get a carb for my S40, but wanted to ask a few questions.  He was pretty rude (my carbs are perfect out of the box, if anyone has a complaint, they don't know what they are doing)--I understand having pride in your product, but before I spend $400, I deserve to be treated with a little courtesy.  Would be curious to hear about other experiences with Murray.
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ThumperPaul
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Re: Help! My bike wont run!
Reply #25 - Yesterday at 15:18:43
 
Like I said...Murray is a crusty old guy that gets very defensive.  We got into a pretty good argument about the exposed length of the cable.  He said, "nobody else complained".  SurvivingPhilly also had the same problem with the cable length from Murray.  My guess is that the people that buy his carbs are newbies, don't know carbs, and don't understand a sloppy cable that's too long.

If you want the Mikuni VM36 carb, I suggest buying Lancer's kit.  Lancer is on the forum and he supports what he sells.
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