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Post by lvgamix on May 10, 2021 14:40:15 GMT -5
hi, so my 139qmb is getting slower a bit everyday, I has sat for a long time collecting dust and now I have revived it(it needed a valve adjustment to start). I have driven it for 3 weeks, about a week ago got a new "tuning" variator with 5.5g rollers, that day when driving home got max speed of 61-63km/h in no wind (stock was about 45-50), but now its getting slower and slower, yesterday got it to go about 55-56km/h max, and today max was 52-53km/h. What can it be thats not letting me get up to max speed anymore, spark plug, air fuel mix, belt? or maybe I need to redo valves. Any advice?
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Post by geoffh on May 10, 2021 14:53:42 GMT -5
Go back in andcheck that variator assy its easy to mess up,did you make sure the belt was loose from the hub as you tightened it ?? don't,t run it till you have checked.
Geoff
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Post by lvgamix on May 10, 2021 15:00:17 GMT -5
when I put it back together the belt was loose, can you explain more detailed (english not my first language)
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Post by geoffh on May 10, 2021 15:07:21 GMT -5
It,s a common mistake not to torque the nut down properly use a wrench not power tools,just check it now it can destroy your crank if it is loose.
Geoff
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Post by CrankingWithCG on May 13, 2021 19:51:18 GMT -5
Just run some gas through her, good belt, change the fluids, and see if it gets better. Check your plug to make sure that after a wide open pull its a nice brown color, or at least not white
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Post by jstich on May 14, 2021 0:57:37 GMT -5
Check and make sure you have all the tire pressure your tires can handle. It might be a bumpier ride but may be worth a few MPH.
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Post by repherence2 on May 14, 2021 23:08:05 GMT -5
might want to recheck you valve adjustment. maybe something loosened up. im just saying this because that is the last thing you touched and after that performance diminished.
or maybe try a new plug?
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Post by dan50 on Jun 9, 2021 17:02:25 GMT -5
Cleaning the carb would be a good idea. Maybe some dirt in the bowl or the jets.
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Post by scooter7878 on Jun 18, 2021 5:37:52 GMT -5
I'd check over what you have done already if nothing wrong there clean the carb fuel with ethanol in it gums up especially from sitting probably some shit in tank and carburetor bowl from sitting worked it's way into the jets check ur fuel filter also
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