B12 gearbox interchangeability n

[davecara]

Just thinking aloud here so bear with me, 

would the clutch/gearbox from a 750m engine fit into a b12? 

[wraith]

Funny this, as I was thinking last night what gearbox's will fit in a b12 motor if a gsxr/gsxf 750/1127???

So I will need to watch this one 

[fatblokeonbandit]

Its all in Frankenstein guide to oilly engines in the Info section,, 

 

it can be done but not easy

dosent mention B12 engines though

 

Just found it so copied it over...............

750R 6 box in a 1127 motor
The only hard thing here is to have a hole drilled through the gear box shaft, for the pushrod.
The 750 6 boxes have a single row bearing on the output shaft, and the clutch does
not have a diaphragm spring. So the easiest 1127 engines to put a 6 box in are the ones with a
single row bearing on the output shaft, and no diaphragm clutch, ie. only the GSXF1127 engines.
In these engines the 6 box drops straight in, only the shaft has to be drilled.
Second easy would be an 1127R engine with a diaphragm clutch, but no double row bearing (88-90).
In this case the box would still drop in, but for the clutch one would have to use the inner
clutch parts from a GSXF1127 (with normal springs) and the outer clutch basket from the 1127R
(with a straight cut gear, not helical).
Most work is in a 91/92 1127R where one would have to match the clutch as above + find a
solution for the double row bearing (the solution is actually to turn the double row bearing
inside out, and make a little hole for the small pin).
Of course the shift drum and forks from the 6 box have to be used as well, but they drop in
any 1127 without problems.

 

[jameskat]

The bandit 12 has a double row output bearing, so it would be the hardest of the options, never done it. As far as I know the output shaft for the double row bearings are longer than the ones with the single output bearings.