John S. wrote: ↑Thu May 28, 2026 3:46 pm
So, if you turn up the boost and instantly strip a rocker pedestal nut. What happened? Backed up pressure? The nut could have been fatigued. Pretty sure it was a German nut. Good news, could have been worse.
My guess is it would be the fault of the nut. I have tons of boosted miles and never had that issue.
I'm using the outer springs on the CB650 duals.
Do you always torque those nuts?? I torque most every nut on the engine except maybe the nuts holding the cooling tins.
Stripped66 wrote:The point wasn't to argue air temps with the current world record holder, but to dispel the claim that the K03 is wrapped up at 150 HP. It's not.
I’m still trying to figure out how, all at once. I blew the rock shaft off, blew out an intake boot and the electric fuel pump stopped working.
I pulled over, turned up the boost. Took off and it went to 19lbs and boom. I limped home with a miss and noticed I had zero fuel pressure. The electric pump under the tank is seized.
I already changed engines and going n/a dual carbs and new low pressure electric pump.
Not done playing with turbos.
John S. wrote: ↑Mon Jun 22, 2026 11:38 am
I’m still trying to figure out how, all at once. I blew the rock shaft off, blew out an intake boot and the electric fuel pump stopped working.
I pulled over, turned up the boost. Took off and it went to 19lbs and boom. I limped home with a miss and noticed I had zero fuel pressure. The electric pump under the tank is seized.
I already changed engines and going n/a dual carbs and new low pressure electric pump.
Not done playing with turbos.
The pump may be the cause rather than a symptom. It may have quit, causing a nasty lean out or backfire situation that caused the gasket to blow out and broke the rocker shaft. I'd definitely dig deeper before putting a few new parts on and reinstalling. Good luck!
