midget gearbox

Post by **aupickup** » Sun Feb 26, 2006 9:04 am

is the midget 1275 gearbox a good one for an ital 1275 engine, also what is the best clutch to use
thanks in advance

Post by **Kevin** » Thu Mar 02, 2006 12:51 pm

The Midget gearbox is supposed to be a bit stronger than the minor one, but best to use a minor flywheel and clutch as its a bit bigger than the Midget one and therefore a bit longer lasting, if you currently have a minor box it should be a straight swop if I remember.

Post by **ian-s** » Thu Mar 02, 2006 1:21 pm

The 1275 gearbox has needle rollers instead of plain bushes on the layshaft. and it has better spaced ratios ( First gear is higher) and I think you will have to change the cltch release arm over.

Post by **Cam** » Thu Mar 02, 2006 1:28 pm

I'm pretty sure the standard Minor gearbox (series II onwards) has roller bearings on the layshaft due to the lateral loading forces.

Perhaps some other bronze bush is replaced with a needle roller type?

They ARE supposed to be stronger though. 1st and 2nd gear have a taller ratio, 3rd is pretty close and 4th is identical.

Post by **rayofleamington** » Thu Mar 02, 2006 3:03 pm

The taller first gear probably makes it stronger just by reducing side loads (weakest design area of a box is often 1st gear, just down to the loadings)

Post by **aupickup** » Thu Mar 02, 2006 5:40 pm

thanks guys
i am sure i will have some questions when i come to putting it in