Definitely run it without the silencer and see if that improves the breathing. If your pipe was within 1" of the internal baffle of the silencer I'll tell you now it was running as flat as a turd! Also running hot. It's exactly what I experienced with the shortstroke. I'd find road models easily pulled away from me at low to mid speed as the motor was being strangled. I've cut the pipe so I have enough to get the clamp on with maybe 1/2" extra for safety and now the thing easily stays with a 650 CSR. The oil burning is definitely another issue you have and either it's due to guides being worn, inlet oil feed adjuster too far out (you can almost shut it off without any serious issues) or rings are buggered again either too sloppy in the grooves or end gap too big.Matchymarty wrote:
I take your point with the carb comments. I had run a 260 main and all 'book' settings. I cooked 3 pistons on that setting. The fella I know who has some factory information that lists cams,CR's, and carb settings, read it and showed me where it said 400-420main. And yes, was '55 Long stroke. So I'm at a loss there, as the manuals say 260. IN any event, it does perform much better on the 420 than it ever did on the 260. Will it cook a piston on a 420? As you've read, I was very close 3 times in the last 2 weeks.
I may well try the 7/16". This will advance it yes? If this is so, why does my bike 'pull better' in it's 'sweet spot', when I retard the lever by around 3/8" of lever travel? I'm totally lost on this one. It doesn't make sense.
My exhaust header is longish (about 1" before the baffle) however the end of the baffle has been cut out of the silencer.
Perhaps I should run it without and see what happens? Marty
The jet is way too big despite what you're being told. All my bikes have SH scrambles cams and they are down on power compared to road models at low speeds but really start to pick up at over 20 mph when roads models can't get anywhere near them.
You'll get there eventually, keep at it and really takes pictures of everything and anything as you're doing it then post them it's easier for us to diagnose if we can see.