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Sportster Motorcycle Motor - Top End Discuss Sportster Motorcycle Top End issues. Rockerboxes, Valves, Cylinders, Pistons, Rings, Lift Rods, etc...

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Old 19th September 2018
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Default Cylinders and static compression checked. Advise?

Ok I did a static compression test last night and got 170 psi per cylinder (engine cold).
Seems a bit low doesn't it. Before the teardown and piston replacement I had about 180 psi.
I have about 1200 km. on the top end. I did a check at about 800 km and I got 180 psi.. (cold engine).
Now I took my telescopic camera into the combustion chamber and the front cylinder looks pretty clean still. The rear has me concerned. See pictures

Front cylinder first picture


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Old 19th September 2018
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well if you just replace parts, it might take awhile to seat in. so a ?
did you do a bore? or just a hone?
did you check for taper?
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Quote:
Originally Posted by bustert View Post
well if you just replace parts, it might take awhile to seat in. so a ?
did you do a bore? or just a hone?
did you check for taper?
Bored 0.010" over with factory Buell pistons

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Old 19th September 2018
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Any thoughts on the pictures?

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Old 21st September 2018
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had to say over the net
but
hd cyl's do not run the same, look at how they are fueled
i run diff heat ranges to even out the two plug wise
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