Help? cg125 replacement con-rod wrong size

dsharman1 · Two Stroke Sniffer Joined: 27 Aug 2014 Karma :

Hi, i have a bit of a situation here. First of all i will state that the engine is not the one that is registered to the bike so all parts have to be ordered by the engine number,the engine number matches to a 2001- CG125M1 .

So what happened is the big end bearing needs replacing so i stripped it down myself and ordered a con rod kit going by the model which the engine is from ,I then took just the con rod kit and the crankshaft to a bike garage to have them split it and put the new bearing in. However i have now been informed that the con rod i have supplied is 2mm too short so i dont know how im going to be able to find the correct one. I dont even know if the one i supplied is the correct length and that it had a different one in before since i dont really know much about the history of the bike , any help would be much appreciated.
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Aprillia rs 50 2000
derbi city cross 125 2007 (RIP 08/2015)
Honda CG 125 2001

dsharman1 · Two Stroke Sniffer Joined: 27 Aug 2014 Karma :

anyone ?
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Aprillia rs 50 2000
derbi city cross 125 2007 (RIP 08/2015)
Honda CG 125 2001

Suntan Sid · World Chat Champion Joined: 07 May 2009 Karma :

Have a look at this site:-

https://www.mitaka.co.uk/ROAD_CON_RODS.htm

It lists various con rods, with dimensions, it shows there are 2 different length Cg125 con rods, 103.5mm and 105.5mm!

Return the one you bought and order one of the correct length!
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"Everybody needs money, that's why they call it money!" Cool

dsharman1 · Two Stroke Sniffer Joined: 27 Aug 2014 Karma :

right, if only i had seen this reply a bit sooner but what i have gone for instead is i have now bought a xr125 bottom end off ebay which had a good big end and main bearings, also the little end takes the same size gudgeon pin which my piston takes so i was going to put my top end onto that
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Aprillia rs 50 2000
derbi city cross 125 2007 (RIP 08/2015)
Honda CG 125 2001

Suntan Sid · World Chat Champion Joined: 07 May 2009 Karma :

Well, at least you have the correct one now!

Can you get a refund on the new one you bought?
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"Everybody needs money, that's why they call it money!" Cool

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Isn't the XR125 an OHC engine, where the CG is OHV?

Suntan Sid · World Chat Champion Joined: 07 May 2009 Karma :

davebike · World Chat Champion Joined: 15 Nov 2013 Karma :

Early XR were overhead cam later used Overhead valve CG type engines

I had an XR200 with the early engine super fun
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Dave
NC750Xdct + others at work !
[email protected]