I have some problems with my 2nd kit that I can't figure out. It seems to be 4 stroking and is tough/slow to start.
I'm running a Grubee Gt5 66 cc.
75 miles on 18:1
Switched to miles Opti 2 100:1 today 5 more miles (80 total)
NGK B6HS, tired B5HS as well as stock plug
Upgraded wire
Tried 2 separate carbs with similar results
Clip currently on 2nd from top (stock was on #3 down)
I have not located any air leaks
Head, intake, exhaust bolts are torqued and loctited.
This engine has been slow to start on a cold start since the first got it. After it has warmed up a bit and then you try to restart it is fine. It sounds like a lot of 4 stroking throughout the throttle and doesn't want to go to higher RPMs.
My comparisons are being made to another Grubee Gt4 66cc that I have. I don't know that this is an impartial test subject as the first engine was from an poor vendor who sent an obviously used engine with clutch issues and would not acknowledge my calls or emails. Engine vibrated to death, threw;locked the chain and eventually ripped out the motor mounts.
Specific Questions
1) I know four stroking to some degree is normal but does this sound right. Speed on a 44t with me just under 200lbs is 20-22MPH.
2) I have tried 2 separate carbs and will also try to raise the clip to the top but if I opt to change the jet, is the stock size 70? Please confirm 1)that a higher number would be a smaller jet 2)Smaller jet should result in more of a lean condition which would help to alleviate 4 stroking.
3) Would magneto or CDI have any bearing on this? Both were from the 1st kit and seemed to work fine there. Is there merit in trying the spares I have?
4) This kit takes a long run to cold start. It is not uncommon to pedal 100-200+ ft to get it to start for the first time. It is also temperamental until it warms up. It usually requires that I warm it up for 2min or so before riding. Is this normal?
From the reading here, I realize that the first step will be clip on top notch. Unfortunately it is a monsoon here today. FYI, In moving the clip from #3 to #2 I did not notice any improvements in the way the engine ran. The plug was slightly less fouled but it was still in heavy break in with 18:1.
Appreciate the help.
Brandon
I'm running a Grubee Gt5 66 cc.
75 miles on 18:1
Switched to miles Opti 2 100:1 today 5 more miles (80 total)
NGK B6HS, tired B5HS as well as stock plug
Upgraded wire
Tried 2 separate carbs with similar results
Clip currently on 2nd from top (stock was on #3 down)
I have not located any air leaks
Head, intake, exhaust bolts are torqued and loctited.
This engine has been slow to start on a cold start since the first got it. After it has warmed up a bit and then you try to restart it is fine. It sounds like a lot of 4 stroking throughout the throttle and doesn't want to go to higher RPMs.
My comparisons are being made to another Grubee Gt4 66cc that I have. I don't know that this is an impartial test subject as the first engine was from an poor vendor who sent an obviously used engine with clutch issues and would not acknowledge my calls or emails. Engine vibrated to death, threw;locked the chain and eventually ripped out the motor mounts.
Specific Questions
1) I know four stroking to some degree is normal but does this sound right. Speed on a 44t with me just under 200lbs is 20-22MPH.
2) I have tried 2 separate carbs and will also try to raise the clip to the top but if I opt to change the jet, is the stock size 70? Please confirm 1)that a higher number would be a smaller jet 2)Smaller jet should result in more of a lean condition which would help to alleviate 4 stroking.
3) Would magneto or CDI have any bearing on this? Both were from the 1st kit and seemed to work fine there. Is there merit in trying the spares I have?
4) This kit takes a long run to cold start. It is not uncommon to pedal 100-200+ ft to get it to start for the first time. It is also temperamental until it warms up. It usually requires that I warm it up for 2min or so before riding. Is this normal?
From the reading here, I realize that the first step will be clip on top notch. Unfortunately it is a monsoon here today. FYI, In moving the clip from #3 to #2 I did not notice any improvements in the way the engine ran. The plug was slightly less fouled but it was still in heavy break in with 18:1.
Appreciate the help.
Brandon
