Tornado
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- Joined
- Dec 5, 2017
- Messages
- 4,796
Bike is 850 mk2, rebuild head and first overbore done two yrs ago. Since sometime last season been having a power dip on what seems like every other engine revolution.noted at pretty much all throttle openings and rpm. Not huge dips, but enough to notice. Pressure pulses out exhaust while idling are weaker on left. Compression test when hot show 120 psi left, 145 psi right.
Head hasket is copper but no idea if shop that did the assembly annealed it. I did do a retorque on head bolts some 500 miles following the fitting.
So compression diff is the big clue. What testing can i do to further pin down if its HG leaking, a valve (new kibblewhites, guides, seat grinds done 3 seasons ago) or piston rings?
Head hasket is copper but no idea if shop that did the assembly annealed it. I did do a retorque on head bolts some 500 miles following the fitting.
So compression diff is the big clue. What testing can i do to further pin down if its HG leaking, a valve (new kibblewhites, guides, seat grinds done 3 seasons ago) or piston rings?