SuzukiSavage.com - Poor idle/Engine quits when throttle closed

Steve H Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 1223 Spartanburg, SC Gender:	Re: Poor idle/Engine quits when throttle closed Reply #15 - 01/19/16 at 04:17:02 That probably means it's still too big. Or, there might be some other problem. I'm thinking still too big for the application.
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Savageman Senior Member Offline Knowledge is half the battle Posts: 275 Marysville, California Gender:	Re: Poor idle/Engine quits when throttle closed Reply #16 - 01/19/16 at 10:46:37 How does it run without the air filter on? Are valves adjusted to .004" in and ex? Do you have the stock vacuum gas petcock or the raptor replacement? What does the compression read? Does it have a nice strong spark? Check all that stuff then post your findings.
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justin_o_guy2

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Re: Poor idle/Engine quits when throttle closed
Reply #17 - 01/19/16 at 13:23:38

justin_o_guy2 wrote on 01/13/16 at 10:13:56:

Just remember that the more time spent just barely idling, on the sidestand, the less the cam is happy. If you can't get the idle speed up, at least get the bike standing up as vertical as you can safely.

I'm also wondering what happens when you adjust the idle speed up.
As suggested above
I would try it without the air filter, and if it attaches with a rubber boot, you have to be careful that it doesn't cover any of the passages in the carburetor inlet.

At idle the vacuum is higher than at higher RPM,, but the petcock can do screwy things.

How old is the gas?

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delaPlanet

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Re: Poor idle/Engine quits when throttle closed
Reply #18 - 01/22/16 at 14:27:59

Thanks, guys -

Savageman, that's a lot of stuff to check, but it's all a great idea. I'm new at rebuilding/tuning bikes, so that is probably all going to take me a long time to get through.

As far as trying it without the air filter, I will do that - good plan. The Ryca kit is weird b/c the carb only JUST fits in the frame with the air filter on it...maybe it's not sealing that well.

Also - I have the Raptor petcock installed. I figured I might as well just get rid of the petcock as a variable a few weeks ago. The gas is new.

Idle speed - I keep playing with idle speed: It helps to keep the bike running when I pull in the clutch/coast with it...but the RPM still drops really low when I do that after a hard acceleration.

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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Poor idle/Engine quits when throttle closed Reply #19 - 01/22/16 at 18:05:45 Mine died many times when I was riding hard and shut down quick. The idle was too low.
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Kenny G Serious Thumper Offline SuzukiSavage.com The Singles Club...LOL Posts: 1754 Robson Ranch, Denton, Texas Gender:	Re: Poor idle/Engine quits when throttle closed Reply #20 - 01/22/16 at 20:27:27 Dela, I would clean the Transient Enrichment Valve if your engine is shutting down when you twist the throttle shut. Kenny G
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delaPlanet YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 13	Re: Poor idle/Engine quits when throttle closed Reply #21 - 01/24/16 at 15:57:36 So - she seems to run better with the air filter off... What is that telling me? There is still an RPM drop after I roll off the throttle/pull the clutch in...it almost dies sometimes - maybe I need a new TEV diaphragm.
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Kenny G

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Re: Poor idle/Engine quits when throttle closed
Reply #22 - 01/24/16 at 17:02:48

Dela,

You only have to remove 3 screws to take the diaphragm out for inspection. DO NOT use carburetor cleaner to clean the rubber diaphragm.
Use warm soapy water and be careful not to tear the diaphragm.

When you remove the screws there is a spring behind the cover, watch that it doesn't get away from you.

Before you reassemble the carb, drop by ACE Hardware and get 3 M4 x 10 MM Allen Head Screws. Stainless steel screws are preferable but anything will be better than the Mikuni screws.

Kenny G

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Transient_Enrichment_Valve.jpg

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Savageman Senior Member Offline Knowledge is half the battle Posts: 275 Marysville, California Gender:	Re: Poor idle/Engine quits when throttle closed Reply #23 - 01/24/16 at 21:16:54 Take some pictures of the inside of that air filter. I suspect it is blocking some air passage ways. Also I see fine dirt in the air cut off valve. Is there dirt in the opening when you take the diaphragm off? Did you blow out all the passages in the carburetor when you cleaned the inside of it?
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delaPlanet YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 13	Re: Poor idle/Engine quits when throttle closed Reply #24 - 01/30/16 at 14:45:55 That pic of the TEV is not a pic of MY TEV - the one on my bike looks new. Also, the air filter is a K&N "pancake" style filter - it's brand new and totally clean inside/outside besides the K&N oil.
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delaPlanet YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 13	Re: Poor idle/Engine quits when throttle closed Reply #25 - 01/30/16 at 15:56:57 I'm so close to having this bike running well...but this last issue is a real pain to figure out. The bike idle dips really low and sometimes it dies when I close the throttle. It's worse when it's warmed up. Here is a video: https://vimeo.com/153636240
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Savageman

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Re: Poor idle/Engine quits when throttle closed
Reply #26 - 01/30/16 at 19:52:41

All it can be is a plugged idle circuit on the carburetor. Take it off and disassemble it and let it soak in some berryman carburetor cleaner overnight then rinse it off with hot water and blow it out with compressed air. That carburetor cleaner in a can is not to good for cleaning small passages inside the carb. Make sure there is no crap in the pilot jet (small hole). Make sure you blow out all the internal passages with air. Also check the float level when reassembling.
There is a small screen filter on the float needle seat. Make sure it isn't clogged.
Do all that and it should run fine.

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Dave

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Re: Poor idle/Engine quits when throttle closed
Reply #27 - 01/31/16 at 09:27:04

It is not a plugged up idle circuit - but the idle fuel/air mixture could be just a little bit on the lean side. Try opening the idle fuel mixture screw a 1/4 turn and see if it improves....try an additional 1/4 if it doesn't. If the smooth idle mixture requires you to have the mixture screw out more than 2.5 turns, it is in need of a larger pilot jet. A 50.0 pilot jet normally works fine with the stock air filter...sometimes a 52.5 if you are at lower elevations. Seldom is a #55 ever needed.

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