125cc engine swap??

[MechCg]

Hey guys nothing stupid please

So on a mechanic apprenticeship so finding my feet

i got a gen moto cs 125.. Now the Exhaust gasket went and i went to sort the studs out..

long story short. not my fault but stud holes are fahucked!!

So im looking at a new engine to swap.

Could i put a pitbike engine in? say a stomp 170cc??
or shall i get a standard 4 stroke 125.. possibly 150/175 but shhh

end of the day im switching the engine no matter what just want some help with deciding what to do.. i like the idea of pitbike engine but ill obvs have to sort the mounting bolts out.. just want to know if it possible??

thanks
chris
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Cgpssedge

[Nobby the Bastard]

[MechCg]

i got my cbt yeah
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Cgpssedge

[Nobby the Bastard]

[MechCg]

not technically no.. i just want an answer wether a pitbike engine would fit on a 125cc scrambler frame??
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Cgpssedge

[Nobby the Bastard]

[RhynoCZ]

Yes, do it.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Teflon-Mike]

If you dont have a l;icence to ride it.. why be hung for a sheep as a lamb.. actually less offences riding a fire-blade with no tax, insurance or licence...

As to compatability.... spects thiun on the ground, hard to tell if its a CG copy motor or an EN copy motyor, either way at a claimed 7Kw it's no scorcher!

Pit bike engines, are usually Honda C70 Cub derived, as its an upright siongle, answr is its unlikely to be bolyt for bolt compatible... the CN derived motors used in some 'big-pits' may be a bit more do-able, buy it would be an the hard way about hacksaw-file and welding rod got rodding the thing to spend money making it less valuable and more illegal so bigger tears when plot sieze and crush....

And iif you have to ask.. you likely do NOT know enough to even try.....

Your call.... suck it up.... sensible would be get a fatster 125 to start with, save money, save hassle and actually stay legal and get what you wnat... more sensible still says suck it uyp and get old enough to take test6s for big bikes.. though a good 15 is as fast as anything legally allowed to go in this country..... how quick you want to loose licence you dont have yet?
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My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'

[Ste]

[Riejufixing]

[Nobby the Bastard]

[Robby]

If the stud holes are fucked, you can drill and tap them up to the next size - so if they are M6, just take them out to M8. You can even get studs with different threads on each end, so M6 on one end and M8 on the other.

A pitbike engine won't fit.

[Riejufixing]

[Robby]

[Easy-X]

[Riejufixing]

[Riejufixing]

[Robby]

It's hard to act indignant about someone wanting to put a 160cc 4 stroke engine in their 125. Back in the day we were all riding derestricted 2 strokes with plenty more power, and enough of them had 180 kits fitted as well.
By all means make the children aware of the risks, but there's no point refusing to answer questions because it's illegal.

Not that it matters because a pit bike engine won't fit. Wrong shape, wrong engine mounts. The engine fitted is probably a 157FMI, and big bore kits do exist for them, but it looks like they use the original head.

So those knackered stud holes still need a fix.