It's a stock bore xr50 with ported and larger valves head. When I put it together everything is right, but it revs up slow not as responsive as it was stock. Do you think the stock carb is to small? if so what would be recomended? Maybe the 17mm???
Maybe a carb problem Stock 50 with ported big valve head
DRTracing
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It's a stock bore xr50 with ported and larger valves head. When I put it together everything is right, but it revs up slow not as responsive as it was stock. Do you think the stock carb is to small? if so what would be recomended? Maybe the 17mm???
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its the head, you dont have enough compression with that piston.
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id say valve clearances, carb tune, or it is probly too much porting for the little 50cc motor
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Is the timing off, as that can really affect the power and revs.
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153 Posts
Since your port and valve sizes are a lot larger now ~ I'm thinking that your little stock piston isn't able to suck the volume of fuel/air mixture through the larger port passage ways adequately; especially at low engine speeds when piston is creating less suction volume.
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Yes
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yesDRTracing said:
This head was ported for a stock motor so I was told. but I have not been able to make it run right . I tried jetting, carbs,pipes that's why I was asking about the compression.power-roll has a 13to 1 kit what is stock? If this does not work right im going back to stock and trow that head in the trash. I think it should as fast as stock not slower like now.
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DRTracing said:
Don't throw the head away. Keep it for when you do upgrade to a big bore ~ it'll work much better then.
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