Hi im new here. Im a mechanic myself and bought a baja 5b 30.5cc and after a while I converted it to a 45cc engine with allow suspension and frames. Lightweight clutch and upgrade housing also dominator 2 exhaust. At first for a couple of days it went awesome popping up on two wheels. I bought a wheeli bar to keep it from doing back flips. After 4th ride couple days later I was giving it a run and then all of a sudden when I hit the throttle it revs and takes off maybe 1min and before it gets up and running the revs die and drop and then revs up again and down again and the car bunny hops so to speak and doesn't get past quarter throttle without the revs dropping. Best way I can describe it its as if I let go of the excellerator and press it again. Up close I tried to see if the servo was backing off intermittantly but its not the case at all.. I changed the clutch thinking it might be slipping and then the bell housing but no change. When its cold it will drive ok but 2min into it this problem occurs. Now im also noticing it take off and the car turns to the right by its self so im starting to think it may be the servo but im not sure. If it were the diff then it wouldn't drive at all but I may be incorrect. I changed plugs aswell but I new it wasn't the problem. Im boggled and need some expert baja experience as my local hobbies shop knows nothing. Please help if a video is needed I will upload. Car starts fine idles fine and if I take of slowly it will drive fine and not back off but as soon as I go full throttle it backs off again.
Baja revving intermittantly after full throttle
- Thread starter Hesham123
- Start date
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best bet is post a vid on here mate, then we can see whats happening 
,
sounds like a radio issue with the turning right, what radio set are you using ?
the rev up and drop off, if you're sure its not servo related, then either an air leak, or bad pulse to the carb which could be caused if the carb/insulator block is loose,
or if the engine is at full temp, then possibly heatsoak from the engine to the carb,
also could be a blocked vent on the tank as well,
when the rev high then drop off happens have a look at the bulb on top of the carb,
if the bulbs empty when it does it it could be the tank vent or heatsoak,
post a vid though
,sounds like a radio issue with the turning right, what radio set are you using ?
the rev up and drop off, if you're sure its not servo related, then either an air leak, or bad pulse to the carb which could be caused if the carb/insulator block is loose,
or if the engine is at full temp, then possibly heatsoak from the engine to the carb,
also could be a blocked vent on the tank as well,
when the rev high then drop off happens have a look at the bulb on top of the carb,
if the bulbs empty when it does it it could be the tank vent or heatsoak,
post a vid though