SC28 engine stops at low speed

[SaikoRev]

Yeahyeah...keep it running at high speeds is the answer, I know!

But serious: Engine stopped at low revs, from 6000 revs and up it ran okay. At first I thought it was a fuel problem. Switched carbs with my trackbike, didn't matter. New fuelfilter/fuelpump etc.: nothing... New sparkplugs and switching all the electrics (including the complete wiring) didn't do the trick either. Bought another engine, that did the trick (needed both my Blades running, didn't have time then to fix the faulty engine).

Now I'm planning to build the "faulty-engine" in my CBR600 streetfighterproject. I took off the cilinderheads. Take a look at the pic of the valves: the right exhaust valves have burnt oil on them. What can I expect? A compression test performed earlier gave me reason to think that the piston(rings) are okay. Anyone got any suggestions?

Attachment 2134

Originally Posted by SaikoRev

Yeahyeah...keep it running at high speeds is the answer, I know!

But serious: Engine stopped at low revs, from 6000 revs and up it ran okay. At first I thought it was a fuel problem. Switched carbs with my trackbike, didn't matter. New fuelfilter/fuelpump etc.: nothing... New sparkplugs and switching all the electrics (including the complete wiring) didn't do the trick either. Bought another engine, that did the trick (needed both my Blades running, didn't have time then to fix the faulty engine).

Now I'm planning to build the "faulty-engine" in my CBR600 streetfighterproject. I took off the cilinderheads. Take a look at the pic of the valves: the right exhaust valves have burnt oil on them. What can I expect? A compression test performed earlier gave me reason to think that the piston(rings) are okay. Anyone got any suggestions?

Attachment 2134

valve giude seals are most likly to blame.....if you building the motor you might as well replace the guides,keepers,seals,all gaskets,rings,and have the head and block surfaced along with a valve grind.