yes, i noticed that the 750 made more than 112rwhp...even more impressive.
for comparison's sake: my mostly stock 86 750 track-engine, with a 90 head, and 36mm flat slides, made 99.6rwhp, with about 51lbs of torque. dyno's have variances, but regardless, you built a healthy 750 engine. i wonder if it is mostly due to the short stroke engine design, or if my engine needs a proper 90-91 bottom-end, for higher revs.
my other 86 750 engine, which is completely internally stock, with 36mm flat slides, makes about 95rwhp, and about 48lbs of torque, but it is a more peaky power band, like a typical first gen 750 engine.
please share some of your engine build details. thanks
Thanks for the feedback on your engine combos; can you share the dyno sheets?
I will be posting a link to the entire build story very soon (I just need to incorporate the photos into the story).
My opinion is, that for a lightly modified engine, the short stroke (1988-'89) engine is the better choice. My engine has 76mm (+3mm, 811cc) forged pistons and Carrillo rods. The key is the DOT head and Slingshot cams; my head had some minor porting done. As is usual, putting a good combination together with all the details looked after was the key. Things like header size, cam timing, port matching, etc. are all parts of the puzzle.
The dyno tuning at the end of the project is very important for optimizing all of the mods. Here is a better dyno graph showing HP and torque on the same page.
Some would say that the extra displacement makes a difference, but I think it only affects the slightly greater torque number compared to what you are seeing with 750cc. It was a chance happenstance anyway as the engine came to me with +2mm over cylinders and one cylinder was scored. I would have built it as a 750 if I had started with a good standard sized cylinder block.
The extra torque just makes the bike easier to ride at the track and it still has a good top-end hit. Hitting the rev-limiter is easy with this engine as it pulls hard.
The CV carbs needed extra tuning on the dyno, but they are very ride-able.