G'day, I have 1987 Bullet 350. It's the SuperStar model and is a 1987 Australian delivery. It's had Hitchcock roller big end and conrod, high comp piston installed. The head has been tidied up and just about everything else has been updated. Its got the close ratio gearset and an 18 tooth sprocket on the front.
It's a great bike but I'm having a power issue with it. It loses power when under load like going up a hill. It's so annoying. It takes off ok, revs out pretty good and cruises great on the flat but as soon as there is a hill and I power on, it doesn't do anything. When I'm doing a long trip and cruising on a flat road (ideal conditions), it'll sit on 85-95 in the sweet spot. If I apply full throttle it feels like something is stopping it from getting full power.
So tuning wise, I've replaced the coil, points plate, auto advance springs, spark plug, and we've timed it using a dial guage that fits into a spark plug gadget so the timing is spot on 0.8mm before TDC. It runs a Mickarb VM24, 95 main jet (at present. Didnt make much difference between the 90 and the 95) slight larger pilot jet and the standard slide (number 2 I think). Exhaust is the standard 350 header pipe with a 500 bazooka muffler and an adapter at the join. I'm running the original airbox. The plug colour is about normal if a bit on the rich side. I measured the inlet port on the head and it's 26mm.
I've tried the Goldie open muffler and sports air filter and a range of main jets and nothing seems to work. How do I get that little bit of extra power to get me up the hill? I'm thinking it's not getting enough air at full throttle but as I said, I've tried just about everything. Any clues would be greatly appreciated.