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05-06-2014, 09:36 PM
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#1 |
 Join Date: May 2014
Posts: 1
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Help! New top end/electrical, lost 10MPH & power
My 150cc qmj was getting harder to start (but ran great when warm, 57 mph) and idle was all over.
1st step: replaced cdi, coil, plug, fuel pump, carb, air & gas filter. Didn't make much difference. 2nd step: tested compression, about 32 psi. Replaced piston, rings, cylinder. Now have good compression and it fires right up, idles perfect and runs smooth, BUT... It now barely goes over 45 (and takes longer to get there) and during wot it will bog for a second or two. So I now have great compression but less speed & power. Any idea why? |
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05-07-2014, 06:38 AM
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#3 |
 
Join Date: Jul 2011
Location: Connecticut
Posts: 493
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Most likely your carb needs to be adjusted.
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2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats. |
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