Vintagemotorized

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Jul 4, 2017
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2
my bike has had compression issues after I ported and polish the engine at first I blamed the base gasket that I made out of cheap gasket maker (it was pretty much bare metal) but when I removed my jug I found these scratches on the cylinder wall going from the top to one of the ports I believe this could of been some burs from when I was polishing the jug
 

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Frankenstein

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Jun 24, 2016
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5,078
Definitely looks like you messed something up..... The only help you can get is to buy another top end I suppose.. You ain't replating that..
 

crassius

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Jul 23, 2012
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4,574
hard to tell from pic, but if your fingernail doesn't get stuck in one of those grooves they may not be deep enough to weaken motor very much

I'd try a GENTLE honing with a nice straight cylinder hone & lots of oil then see if it runs.
 

jaguar

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Nov 25, 2010
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What oil ratio did you use?
Do you have a paper air filter or an oiled foam one?
Do you have a high compression head?
 
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