Main Motorcycle: '06 Tiger 955i
Join Date: Aug 2011
Location: Central France
|Air Cooled Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.
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Here's a question for the tuners... at what redline will be bike blow up?
As the sig says, I have:
* early '01 790 cams
* shim under bucket conversion
* double vlave springs
* +1.5mm oversize valves
also the following might play a part:
* inlet and exhaust ports have been smoothed and polished
* Wiseco 904
I raised the Procom's rev limiter to 9,000 and everything's been fine for a couple of years. (Yes, I regularly hit the redline.)
This year I made some 48mm headers (internal diameter is 45mm) - and now the bike still pulls quite well at 9k.
I'm quite tempted to raise the redline 100rpm at a time and stop when I feel a dropoff in power... but...
When can I expect everything to let go? 9,050 rpm or 10,000 rpm?
thebiglad - good point... Funnily enough one of the things I thought I'd do this winter was go to a 520 chain using sprockets for other bikes - the closest I'd got to the stock gearing of 18/43 (which I find to be the perfect match of top end and acceleration) was 17/45 - assuming 1 tooth at the front equates 3 at the back my proposed gearing (1 smaller at the front and two bigger at the back) would drop (slightly) overall... Maybe I should look to see if I can get 19/39(38?) (1 bigger, 4(5?) smaller) to increase the gearing slightly....
Thanks for the tip!
I was wondering about that - but I have a 530 chain on at the moment and would kinda need to replace it anyway... But you're right... A 19t 530 sprocket would be a fairly cheap solution to test the gearing first before committing to a 17/39 and 520 chain!
they all should hold together to around 8500 for short burst.Above that things like stock valve springs and conecting rods can let go.But like phil said its no need to rev it passed where the hp is.Stock motors run out of hp way before 8500.Some a good ways below 8000.
To set one up to go 9000+ you better have everything right even the crank needs work.
with streetable cams you wont gain any thing in the 9000+ range anyway.
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