AussieSteve
Active Member
My longer studs and slimline air filter etc. arrived from SBP yesterday. The air filter is great. Looks good, low restriction and it seals well to the carb, unlike the stock filter. They also have a metal exhaust gasket that I'm trying.
I've had the engine out to modify engine mounts, but just got it back in with the billet head on. A couple more things and I'll take it for a spin in a day or so and re-test compression. I'll post results on performance and compression.
When the billet head was on a few weeks ago, there was a very noticeable power increase, but also a noise increase. The fins on the billet head ring like a chime, amplifying any piston-slap noise and need damping rubbers. That's next. I've already done the cylinder fins.)
(There was one stripped cylinder nut at the time, so the compression might be even higher when I test it next. Hope I can start it.)
squid, maybe my inlet gasket was from a bad batch, if you say others are using them and they're OK. Also, maybe the 8ml/litre octane booster that I use affects them. Don't know and don't really care. I won't buy any more to find out. Much rather cut my own gasket from 0.8mm oil-jointing paper. It never swells.
Fabian, I agree with you on the RSE billet inlet, too. My DIY grooved/'o' ringed alloy inlet works well, clears the clutch cable and the carb sits on an even flatter angle than with the stock steel tube. (Problem there is that the alloy tubes have a smaller ID than the steel ones, theoretically restricting flow slightly, although I noticed no difference in performance with it fitted.)
... Steve
A pic with SBP filter and RSE head fitted:-
I've had the engine out to modify engine mounts, but just got it back in with the billet head on. A couple more things and I'll take it for a spin in a day or so and re-test compression. I'll post results on performance and compression.
When the billet head was on a few weeks ago, there was a very noticeable power increase, but also a noise increase. The fins on the billet head ring like a chime, amplifying any piston-slap noise and need damping rubbers. That's next. I've already done the cylinder fins.)
(There was one stripped cylinder nut at the time, so the compression might be even higher when I test it next. Hope I can start it.)
squid, maybe my inlet gasket was from a bad batch, if you say others are using them and they're OK. Also, maybe the 8ml/litre octane booster that I use affects them. Don't know and don't really care. I won't buy any more to find out. Much rather cut my own gasket from 0.8mm oil-jointing paper. It never swells.
Fabian, I agree with you on the RSE billet inlet, too. My DIY grooved/'o' ringed alloy inlet works well, clears the clutch cable and the carb sits on an even flatter angle than with the stock steel tube. (Problem there is that the alloy tubes have a smaller ID than the steel ones, theoretically restricting flow slightly, although I noticed no difference in performance with it fitted.)
... Steve
A pic with SBP filter and RSE head fitted:-
