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Originally Posted by STB
Nothing like a bike which starts when it ought to. My engine has the stock TB on it now and it runs and tunes like a champ. No variation for several months. But HP is limited to about 112 or so.
Mike Roland, I heard, posted some tests using the 57mm on "smaller" CI engines and reportedly found no detriment. I don't know how small he went, though. I heard he posted it on HTT forum, but I have not seen it. I agree that bigger is not better if you don't need bigger. I was pushing more than 120 hp with 6.1 gps @ 58 psi injectors until I "taco-ed" the 57mm butterfly. I am leaning towards the BCG dual plenum, but I see a few 124 ci engines running single plenum TBs (Zippers TB in most cases and a few Kury) without the problems I had. If I had my druthers, it would be a stock TB at about 54mm, but it does not exist to my information especially at 1.8" manifold port. So, when the new Kury 57mm comes in, it is either sell it and buy the BCG or try it again and see if the first one I had was sold to me with a broken butterfly/throttle shaft. If I had no curiosity, I might not have any problems at all ....................... and I could hang curtains for fun.
STB
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I had a couple of options after my stock Delphi throttle shaft broke, new delphi or something better and more expensive, I decided on the Gerolomy and then Grock steered me towrd the injector check and I bumped it up to the 4.89's. I installed the DTT late last summer and fought with it for months because the throttle rod was cracked, I have now figured out, when it finally broke I understood why I had so much trouble. My goal now is to be able to get on the bike hit the button and ride 500 miles, something I haven't been able to do for a while. It seems to be back to dependable, now I start trying to get some more HP. I will tweak away as the weather gets colder and take in in to the Dyno maybe in December to see what the numbers are. I would expect over 110 easy and maybe even 120 with some work, all the parts are in place. Now for the hard part fast and reliable.
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