Clone rpm question

[oneman]

The motor cannot rev above 7300, I tried to change the gear ratios but still the motor does not rev more.

I think this is related to the 58mm crankshaft, just wanted to hear your opinion on this.

Before that I used a 54mm crankshaft and a different crankcase, the RPMs were fine, but after replacing this, I ran into this situation.

 

[flattop1]

the longer stroke would affect it some . I doubt it would totally eliminate it from turning over 7300.
Its possible the cam centerlines have changed . Has the bore also changed or any other items ?

 

[R Bahnsen]

do a leak down test, chances are you are down on compression. the 58mm crank should not have any affect on the engines RPM capability just longevity.

 

[oneman]

the longer stroke would affect it some . I doubt it would totally eliminate it from turning over 7300.
Its possible the cam centerlines have changed . Has the bore also changed or any other items ?

do a leak down test, chances are you are down on compression. the 58mm crank should not have any affect on the engines RPM capability just longevity.

I did not change anything but the engine block and crankshaft, everything remained from the 54mm engine.

Well, I'll check the center of the cams and do a leak test.