loss of power at 3/4 throttle

[memesare]

i have it running fine, just got a new ngk sparky, new boot and got the carby cleaned out, it was going easily 47-52 kmh now it maxs out like 35-40 going flat but down hill obviously i gain power, was actually running it about 70 kmh last night, but yes i get to full throttle and it feels like its vibrating more and theres a significant power loss, any fix ive just broken the motor in ive been running it on 50:1 like the builder told me to use and that seems fine, not sure about the whole ruch/lean thing any thoughts?

 

[Chainlube]

yes hpefull it hasnt damaged at all cause its just started to slow down a week ago and only used it twice since

Check the torque on your head bolts.

 

[Wyvern]

yes hpefull it hasnt damaged at all cause its just started to slow down a week ago and only used it twice since

My pops ruined a 15 year old snow blower in 5 minutes not mixing oil.

So you can wipe out 2 strokes in a hurry.

Hopefully for you, because you were running thin, you were running rich and that made you "4-stroke" earlier.

That's basically when the engine can't burn or ignite all the fuel which leads to a misfire till next cycle when it clears away enough fuel to fire once again.

You DO want your engine to 4 stroke a bit at WOT and at full speed, it acts as a rev limiter that also puts extra oil in your engine.

 

[memesare]

If you have a typical China Girl 2 stroke motor like most have here, we NEVER run them at 50:1 ratio, especially during the breakin period.
Typical breakin is usually 20:1 to 25:1 ratio and after breakin, no less oil than a 32:1 ratio on most of the normal China Girl motors.

Just needed to tighten the the engine more and also changed the ratio to 32:1, now running 55kph on flat, extremely smooth ride

 

[memesare]

Just needed to tighten the the engine more and also changed the ratio to 32:1, now running 55kph on flat, extremely smooth ride

My pops ruined a 15 year old snow blower in 5 minutes not mixing oil.

So you can wipe out 2 strokes in a hurry.

Hopefully for you, because you were running thin, you were running rich and that made you "4-stroke" earlier.

That's basically when the engine can't burn or ignite all the fuel which leads to a misfire till next cycle when it clears away enough fuel to fire once again.

You DO want your engine to 4 stroke a bit at WOT and at full speed, it acts as a rev limiter that also puts extra oil in your engine.

Just needed to tighten the the engine more and also changed the ratio to 32:1, now running 55kph on flat, extremely smooth ride

 

[Wyvern]

Just needed to tighten the the engine more and also changed the ratio to 32:1, now running 55kph on flat, extremely smooth ride

Just needed to tighten the the engine more and also changed the ratio to 32:1, now running 55kph on flat, extremely smooth ride

Good to hear!

 

[Techman1961]

go to 32:1 right away.

 

[DAMIEN1307]

go to 32:1 right away.

He did that already.

Just needed to tighten the the engine more and also changed the ratio to 32:1

 

[radiatedmocha27]

Not just what carb, but what engine too? 50:1 is way too little oil

You need to be mixing that thing up at least 4 oz of oil to 1 gallon of gas and you should be buying premium only less ethanol needs more lubrication

 

[robe]

Now you have it running well, take it easy for a few tanks. You keep pushing it's top speed you will kill it.