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Post by shamrockexpress on Feb 23, 2008 20:30:39 GMT
can anyone tell me what the differences is between px 200 crank and px125, i know they are the same stroke, so what else?  are they interchangeable. if so do the same bearings do each casing, p2 and p125  |
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Post by Juan on Feb 23, 2008 20:40:45 GMT
The webs are thicker on the P2 crank but not sure about anything else.I'm fairly sure Oz uses a P2 crank in his 166 and he'll be able to tell you for definate.
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Post by shamrockexpress on Feb 24, 2008 0:05:58 GMT
well thats a start, juan thanx, anymore info would be appreciated guys!!!!!!!!!!!! If you contribute to this thread people wont think any less of you it is still a vespa question ;D we,re not talking L*******  |
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Post by guy160 on Feb 24, 2008 11:37:25 GMT
Bearings are the same, crank web on the inlet side is thicker on 200 cranks. Won't fit in a 125 without modifying the cases.
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Post by shamrockexpress on Feb 24, 2008 12:28:52 GMT
Bearings are the same, crank web on the inlet side is thicker on 200 cranks. Won't fit in a 125 without modifying the cases. cheers guy thats the answers i was looking for its just i dont have the parts altogether to compare. thanx  |
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Post by ozoap on Feb 25, 2008 7:58:28 GMT
You can either modiify the casing or the crank web to fit a 200 in a 125 case.
The 200 crank has a 5mm longer rod, so needs a pack plate, and uses a 16mm gudgeon pin.
I use a Yamaha smallend bearing to fit a 125/166 piston to a 200 rod.
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Post by shamrockexpress on Feb 25, 2008 23:07:40 GMT
OZ just out of curiosity what benefits is there to using a 200 crank in 125 casings? is it for strength and would you pack up the mallossi cylinder to compensate rod length would this make more torque. You can either modiify the casing or the crank web to fit a 200 in a 125 case. The 200 crank has a 5mm longer rod, so needs a pack plate, and uses a 16mm gudgeon pin. I use a Yamaha smallend bearing to fit a 125/166 piston to a 200 rod. |
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Post by ozoap on Feb 26, 2008 8:25:00 GMT
Using a 200 crank means you can run a wider inlet port. Mine is a 60mm stroke 200 crank, so 3mm longer stroke and 5mm longer rod. It needed a 6.3mm packer and mods to the piston for the ports to line up. It goes quite well  When tuning a 125 to anything more that bolting on a kit, I always convert to 8mm barrel studs.   |
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Post by shamrockexpress on Feb 26, 2008 21:17:21 GMT
Very interesting OZ,
It sounds like alot of work to put into a 125 engine to get power which would be easier found in a 200 or T5 motor,
In the other hand it sounds like a worth while conversion if you only have access to a 125 engine which i suppose are more readily available and cheaper than the others, so its interesting to see the less desireable 125 engine put to good use!
I have polini 177 motor ported in one of my scoots and easily runs with P2s as its very torquey, have you tried your conversion on a polini?
The work youve done seems a good idea and should be in more demand soon as the p2 and t5 engines become more scarce and expensive, so good luck and keep er, lit. ;D ;D
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Post by ozoap on Feb 27, 2008 21:02:21 GMT
It has 19hp on the dyno. Is more than a match for many 172/210s. Engine is currently living in my scootercrosser.  |
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Post by rocket on Mar 15, 2008 6:22:25 GMT
i have to say i like that, shame its not on the road with all its clothes on, i bet that would suprise a few people.
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Post by ozoap on Mar 15, 2008 9:38:43 GMT
The engine use to be in my rally going bike '99/'02 with P2 primarys.
Now got T5 primarys in it. The crosser does have a daytime MOT. It's fun, but a bit revvy for any distance work.
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Post by silverfiesta on Nov 15, 2008 0:01:36 GMT
I would love to know how you got those forks to fit
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