G
Guest
Guest
That shouldn't happen with just an aftermarket filter.
Have you checked valve clearances lately?
Did you leave it idling without a fan blowing on the engine?
Hi Steve,
Yes yes, I checked and corrected valve clearance before trying to reset the air screws to specifications, and I left it idling in open cold air without a fan : the center pipes turned sightly red at idling, and all four pipes went full red at 4000rpm.
To be complete the previous owner installed the aftermarket exhaust, and I installed the K&N airfilter to replace the crumbling stock filter.
The center cylinders air screws had been almost closed by the previous owner, and Cyl 1 and 4 screws were open to perhaps half specifications.
It's quite possible that there are air leaks from the airbox and perhaps carb O-rings (although idling is stable).
The side rubber gaskets of the airbox are loose and hard to fit, and the top foam gasket of the airfilter case seems a bit crushed...
I have received new O-rings and a sigma6 kit with two main jet sizes that should fit the current filter/exhaust.
I plan to install all that and follow BassCliff's instructions on airtightning the airbox, hope it will do!
Seb