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Sporadic Idle and Throttle Lag
https://www.mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=75416		 Page 1 of 1
Author:  SlimOx [ Tue Nov 17, 2020 5:42 pm ]
Post subject:  Sporadic Idle and Throttle Lag
Hey guys,

2012 CDI 35. Will C mods on a short block. Mikuni carb. Cam, rods springs etc. high rev coils. The whole shabang. Been running like a top. Changed fluids, and now I’ve got sporadic idle. Checks valve lash, intake was off a bit. Everything set back to .005.

I’ve tinkered with carb. Throttle is lagging, sounds like it’s starving/sucking for air, then it jumps up and runs perfect. Still pushing full 33mph. Let off throttle, idle is high after running WOT then it settles in. 10-15 seconds it will idle up just slightly and fall back.

Can’t figure this one out. I guess it could be a gasket somewhere. Places to start?

Any help is appreciate. Will, if you see this feel free to call :)


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Author:  jc [ Tue Nov 17, 2020 6:49 pm ]
Post subject:  Re: Sporadic Idle and Throttle Lag
Check your intake adapter. The rubber that mounts the carb to the intake can crack over time and cause issues.
Author:  Russ [ Tue Nov 17, 2020 7:23 pm ]
Post subject:  Re: Sporadic Idle and Throttle Lag
Also check where the intake bolts to the egine. Sounds like an intake leak somewhere.

#CFFITR
#mudmotor>physics
Author:  lastchance [ Wed Nov 18, 2020 6:13 pm ]
Post subject:  Re: Sporadic Idle and Throttle Lag
Also check the black vacuum plugs on that carb for cracks

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Author:  SlimOx [ Wed Nov 18, 2020 7:09 pm ]
Post subject:  Re: Sporadic Idle and Throttle Lag
I’ve discovered a gasket tear upon removing the carb. Also realized threads have possibly vibrated a screw out or the threads are stripped. Looks like a rethread is necessary. Yikes.


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Author:  Will C [ Thu Nov 19, 2020 2:34 pm ]
Post subject:  Re: Sporadic Idle and Throttle Lag
I agree with these guys. Especially the gaskets between intake and heads
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