Triumphrat

Max_NYC

Hiya,

Is there a world of difference between the 904cc and the 988cc Big Bore Kit?

I have the 904cc installed on my 02 Bonnie (with Mikuni carburators and the Bub exhaust system) and wonder if it's worth the upgrade (and $500).

Max
Frenchie in NYC



[ This message was edited by: Max_NYC on 2006-12-21 15:56 ]

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sweatmachine

about $2000 in parts and machine work (to stroke the crank) and a total engine teardown/rebuild.

I believe the stroked motor makes 90-95hp and 75+ ft lbs...

and it makes more torque at a lower RPM.

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WS

I have been told the 988 is a stroker kit and crankcase modifcation must be made. Correct me if I am wrong.

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vertwrks

You can do the 904 it with the engine in the frame, the 988 you have to basically tear your bottom end completely apart which is a much larger undertaking. Maybe worth it, I guess thats up to the individual. If money and or time were not an issue I would say I would go 988.

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04 Bonneville w/904 kit, 1mm over valves, ported, ARK'd, Bub's, HSR 42's, F3 forks, kyb rear shox, F3 clip ons, Brembo M/C, 6 pot caliper, 17" Excel's, this & that

Brooksie

Max-how'd you like the step up to the 904? Sounds like you're getting good performance without going to a new engine, basically.

sweatmachine

max, if you already have the 904, to go to the stroked 988 kit you wouldn't have to change the bores, probably just hone them a bit.

The bore remains the same, but the crank is stroked another 1/4''.

So you're 1/10th of the way there...

__________________
Who says being a tool is a bad thing? I have more use for my tools than I do for most people.


Click for a picture of my slightly modified Bonnie