Originally Posted by blissful1
Current setup is 2008 speedmaster with 2800 miles. The bike was equipped with TOR shorts and the carbs had been rejetted when I purchased it. Bike runs very well, no popping or fuel smell, so I think the carb is spot on. The original chrome air screen is still on, so I don't think the air intake has been reworked, but I will have to take a good look and see if anything has been done on the intake side. I agree with everyone; at this point I think the cams, carb, intake and ignitor will give me all I want (low 60's hp). Is there a core charge on the cam from TPUSA? Is there a market for the old carbs? I just had rotator cuff surgery Tuesday, so there is no hurry. This will be my project for the winter. Mike in va; maybe one day I can get out to the western part of the state and check out what you have. Thanks and safe riding to all.
Bliss, as I have said before, I'm really not familiar with the 270 engine at all. I have ridden a couple of Scramblers and the power deliver seemed really different to me than the 360 engine.
That said, TOR's, for the Bonnies anyway, are the most restrictive, flow wise, of any "performance" pipe out there. If you like the volume level and tone and you don't want to go any louder, they will be your limiting factor on the ability to get your engine to breath. You should get good gains though by doing either an air box elimination kit or the air box "carve" (the DIY version), going to pod air filters and getting the jetting dialed in. If you want to keep the TOR's (just making an assumption here), swapping out the carbs would be kind of a waste.
With 60ish rear wheel hp as your goal, I recommend that you do some sort of air box elim., talk to Carlos at TPUSA about the cams (and no, no core, you pull yours and send them out) and contact Mike, aka Pieman, at Triumph Twin Power about an ignitor reprogram. You can always send the cams and ignitor out at the same time so that it minimizes your down time. You should have absolutely no problem hitting your target hp doing those mods... even through the TOR's and using the stock CVK carbs...
A 790 Bonnie (360 crank & the good stock cams) will put out around 70 rwhp & 50 lb. ft. of torque by doing just the "carve"/pods/re-jet/ignitor thing and using free breathing pipes... so it really doesn't take much to get fairly good performance gains on these engines... you just have to pull the corks out of their nose and arse...