Phantom 85 gasket

[DAMIEN1307]

It’s official guys, my p85 sprung a leak already, the gasket under the jug is leaking, not even 20 miles on the motor.

Hopefully you have been retorquing the cylinder bolts after every single heat cycle for at least the first 200 miles.

This must be done because the threading where the studs go in will keep expanding and contracting which in turn loosen up on you and will cause the gaskets to leak and loss of compression.

If you haven't done it, they WILL be loose.

That torque adjustment must only be done once the motor is totally cold again and must be performed in an X pattern.

 

[Rome]

I’ll go ahead and do that before todays run thanks man hopefully that does it, if not do I just replace the gasket at that point?

 

[Rome]

Hopefully you have been retorquing the cylinder bolts after every single heat cycle for at least the first 200 miles.

This must be done because the threading where the studs go in will keep expanding and contracting which in turn loosen up on you and will cause the gaskets to leak and loss of compression.

If you haven't done it, they WILL be loose.

That torque adjustment must only be done once the motor is totally cold again and must be performed in an X pattern.

It did the trick my man THANK YOU!!

 

[ImpulseRocket]

It did the trick my man THANK YOU!!

Keep track of it regularly for the break in period. They get loose a lot during that time as you heat cycle the engine. I always suggest giving them a quick check with your torque wrench before every ride.

 

[Deleted member 35519]

In this engines case, it is true. Context matters.

Whats your squish gap and what difference did it make? Performance?

 

[ImpulseRocket]

Whats your squish gap and what difference did it make? Performance?

.9mm. No clue on the difference in performance as it was set from the very beginning, as was the port work I had done to port match the intake and round the roof of the exhaust port.