c1 slight problem - Pocket Bike Forum - Mini Bikes
 
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post #1 of 2 (permalink) Old 07-03-2019 Thread Starter
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c1 slight problem

Cam this is my used plug against an out of the box plug unused.

The bike is getting now that it has to idle very high, anything below like 1500-2000 rpm and it just cuts out (might be a coil faulty or coil gap issue as it used be able to idle really low this bike) anyway. If you stay above that it'll stay running.
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post #2 of 2 (permalink) Old 07-03-2019
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Re: c1 slight problem

Quote:
Originally Posted by Greg72 View Post
Cam this is my used plug against an out of the box plug unused.

The bike is getting now that it has to idle very high, anything below like 1500-2000 rpm and it just cuts out (might be a coil faulty or coil gap issue as it used be able to idle really low this bike) anyway. If you stay above that it'll stay running.
I get exactly what youre saying.....Its not a coil issue....

When you get a foul to dangerously lean back to hard to keep idling condition like in your video its always an arleak…An incorrectly set float will exhibit similar symptoms too but wont rev up and stay revved up...it will rev on the highend like its got a rev limiter......

Reason its running the way it is-is because when you jet or adjust the carb for the best running by incrementally adding fuel to compensate til you have to start turning the idle up to keep it from fouling out …
In the vid I saw you turning the idle screw pretty widely to compensate when the revs starting shooting up then once the airleak resealed the engine dropped substantially and then shutoff from being over-fuelled......…

Does the carb you have on there have a screw to adjust the air to fuel ratio?

Start over all carb settings set back to factory settings...if the bike wont run right you need to remove engine and find the airleak using the method I posted to your youtube vid in the comments..….

I know you said youve rebuilt a few of these engines but Im gonna boldly say youve been quite lucky so far to have never run into an airleak problem with a chinese mde and chinese kid assembled replica engine of a real euro made Blata racebike engine........

Ask EPR he didnt even get past break-in with his brand spanking new B1/C1 rep Mt-A4 and had to rebuild the whole engine over....

Even NaSa one of our most illustrious mods to ever take center stage at PBP made a thread on how to make them more reliable...……….

The sparkplug strap on the old spark appears to have been subjected to some pretty intense heat as it looking discolored from blueing more than being oil fouled..Even the tip is massively glazed and yet the insulator exhibits a butterscotch brown.......…...

My money is on the crank seal behind the flywheel or the one behind the clutch as being the culprit if not its got to be either the intake or reedplate......…

Good Luck

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Last edited by CAM2; 07-03-2019 at 02:28 PM.
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