Swm 125 Into 280 Frame

[reginald]

hi guys,

My understanding is that a swm 125 bottom end is identical to a 240/280. have i got that right?

We have come across a 125 engine that would be a cheaper option than repairing the gear shaft on our 280 in the short term and eligible for my daughter to ride junior.

A couple of questions.

does the 280 exhaust fit the 125?

Does the 280 top end fit straight on the 125 or do we need to machine the cases?

What gearing is used on the 125?

Any help appreciated.

Cheers

Mark

[jbswm]

125 bottom end will bolt in frame. 280 topend will not fit 125 bottom end.125/175 have different topend .280 pipe won`t bolt to 125 topend different size flange .would be simpler to fix 280 motor

[reginald]

Thanks JBSWM - you have 7 280s? Wow.

Still need a 125/175 for the girl for riding junior....so might chase a 125 header pipe.

[motoswm]

I have a 125 front pipe and middle box here. You need the middle box to suit the smaller diameter front pipe. Rear tailpipe is the same for 125 & 320

Martin

[reginald]

I have a 125 front pipe and middle box here. You need the middle box to suit the smaller diameter front pipe. Rear tailpipe is the same for 125 & 320

Martin

Thanks Martin, I'll email you to arrange purchase.

Is the carb diameter for airbox hose fit the same or smaller carb?