Bonneville America Forums Forums Technical Forums Performance Mods NOT a BB but still interesting

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This is designed to be a drop in kit.
With the 904 you have to have the sleeves pressed into the jugs. With this kit you swap pistons and cams, no need for a shop.

Im waiting for Carlos to do a dyno run and see what this gets.

He estimates 8-10 RWHP.
If stock is 54 bhp / 51 ft lb stock reference #s
904 is 74 bhp / 64 ft lb 904 reference #s (average taken)
865 kit is est to be 63 bhp / ?? ft lb

Huh...I think I just figured out the BB, even with machine shop labor, is a better performance option.

Now I really want to see the dyno #s.

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I may be changing my tune here...what Im finding is that you can make more power in the end with a 904 kit (after adding cams, headwork, carbs, ignitor etc...) BUT after some more…ok a LOT MORE thinking and looking and reading and such here is what I have now come up with:
Seems that there are dyno results for this 865 kit on the Triumphtwinpower site.
Ive emailed jut to verify BUT the initial results look like the TPUSA kit can make upwards of 74.6hp/52ft-lb with a custom mapped ignitor. With the OEM ignitor it can make 70hp/49ft-lb.
Heres the chart posted on theTriumphtwinpowerweb site.
The beauty here is that these results seem to be for a 270 not a 360 twin