I picked up a basket case 850 E start. I think that I'm going to need pistons. I'm considering the 920cc big bore kit from RGM. (It's a standard bore now so I don't need to sleeve.)I'm looking for opinions from people who have done this. Was it worth it, as far as being a noticeable power improvement over an 850 (828)? Any regrets? I was going to go with a Megacycle 560-NSS and bump up the compresion a bit (9-1). Any thoughts will be appreciated.
#3. "RE: Opinions on Big bore 920cc" In response to Reply # 2
RGM website is
Also try Norvil, of course.
I had a 920 kit on my Mk1 850 some years ago, and it made a good bike better. I have a Mk3 now, and when it goes bang (but it won't, and I'm too miserly to do it until it does) it is also getting a 920 kit.
Maybe a bit less revvy, but even more of that lovely torque! Other than jetting, which is close anyway, no real changes are involved.
A bit of a diversion, but the old T160 Triumph Trident (the last ones, with electric start)was always meant to be an 850 not a 750, and as an 850 or 900 (both available today) it too is a transformed bike.
Hope this helps,