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Engine Stutter After 5k

  • Thread starter Thread starter PAULJAC47
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PAULJAC47

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Hi Guys,Been trying to get my 82 gs100g running right since November,latest problems is a high speed misfire after 5k revs,bike is a bugger to start (still)not as bad though since valves adjusted.Once bike is warm starts and idles fine and ok up tp 5k revs then misfires from then on.Have cleaned carbs,new air filter, new diaphragms,lowered e clip to enrich mixture on all carbs(seemed worse)refitted all exhaust(no leaks) though this is an aftermarket pattern that is more free flowing,but i have wrapped baffles with proper baffle material.On the hard starting will only start on 1/10th choke any more kills engine?.Have fiited new plugs B8es,checked float level,new petcock and float needle valves as originally carbs were overflowing.Plugs are now showing grey after plug chop,have set pilot screws on top of engine intakes to 1 1/2 turns out but have set with gunsons to no avail,Starting to think may be electrical? though happens hot and cold......any ideas gratefully accepted.......Cheers Paul J..
 
how bad is the stutter?
What i mean is, will it still run, or does it cough, bog, and die if you keep the throttle open.

Will it get past 6 or 7k?
 
stutter after 5k

stutter after 5k

More like a slight misfire engine will rev right up to red line only sympton i can relate it to is when a car condensor breaks down and you get arcing in points cant be in this case as electronic ignition.
 
PAULJAC47 said:
... lowered e clip to enrich mixture on all carbs(seemed worse)...
Click to expand...

Since richening your fuel mixture made your problem worse, try leaning it out and see if that works.

Mine was doing the same "won't run past 5000 rpm" thing. Leaner mixture cured that: two notches leaner (clip up) on the needles and two sizes smaller on the main jets (from 110s to 102.5s). Now it revs strong to redline, and the plug colours seem what they should be.
 
PAULJAC47 said:
Hi Guys,Been trying to get my 82 gs100g running right since November,latest problems is a high speed misfire after 5k revs,bike is a bugger to start (still)not as bad though since valves adjusted.Once bike is warm starts and idles fine and ok up tp 5k revs then misfires from then on.Have cleaned carbs,new air filter, new diaphragms,lowered e clip to enrich mixture on all carbs(seemed worse)refitted all exhaust(no leaks) though this is an aftermarket pattern that is more free flowing,but i have wrapped baffles with proper baffle material.On the hard starting will only start on 1/10th choke any more kills engine?.Have fiited new plugs B8es,checked float level,new petcock and float needle valves as originally carbs were overflowing.Plugs are now showing grey after plug chop,have set pilot screws on top of engine intakes to 1 1/2 turns out but have set with gunsons to no avail,Starting to think may be electrical? though happens hot and cold......any ideas gratefully accepted.......Cheers Paul J..
Click to expand...

Raise um...the more you lower them, the more you "plug the hole" 8-[.
If your fouling out the plugs at an idle/ cold start situation and can only start it with 1 /10th choke, you must be runnung too rich on the pilot circuit. Have you vacuum synched the carbs? :-s The high speed misfire may be a leaning out problem with the lowered clips and or too small of a main jet size.
 
Lowering the E clip would raise the needle... If that's what you meant then we are on the same page...
 
stutter above 5k

stutter above 5k

Bit confused now guys,on on the needle are 5 grooves the middle is the factory setting i believe. so if i put e clip on bottom groove i am going max rich? the top groove(nearest to the top of carb) is leanest? is that correct?
 
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