• Husqvarna Motorcycles Made In Sweden - About 1988 and older

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1972 cr125 rebuild cylinder sizes

Dave-cr125

Dave-cr125

Husqvarna
AA Class
Hi All,

I am putting back together a CR125 from 1972, an early bike with alloy mudguards. It's all there and I have had the bike for about 15 years and rode it when I first got it, although it did have a few problems with carburation. Over the years I picked up many parts that I thought might come in useful. Now it's time to rebuild it.

I picked up a barrel on first over in good condition, as I had a new piston for this bore I decided to use it. However when I slipped the barrel on, the piston stuck out of the top a bit! The barrel is shorter (6 fins), than the one that was fitted ( 7 fins). I'm going to put the original barrel back on. Anyone know the changes to barrel/bore over the years 1972 - 1974 ?
 

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Is the picture your old cylinder? 125 had two length rods and pistons.Post a picture of the other cylinder.
 
I was wrong about the barrels, they are the same, 6 fins on one side, 7 on the other. The difference is the piston, I was trying to fit a piston that was for a 74 CR125, where as mine is a 72, and they have a the pin hole at different heights! Shame to not have a fresh piston in place, I have reverted to the 2nd over jug with the existing piston, which is OK.
 

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Top piston is for the short rod motor.Does the other cylinder have fin webs? That would be a 74 Cylinder
 
cylinders are not webbed as far as I can see, both are the same. As you say, it is the long rod motor, both barrels are the same. Its a pretty early 1972 bike, not seen many with alloy mudguards
 

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The 72 125's had HVA silver forks not the Betor shown in your picture.. the frame gusset / bracket at the swingarm pivot says the frame is 73/74 also..
 
watto450 said:
The 72 125's had HVA silver forks not the Betor shown in your picture.. the frame gusset / bracket at the swingarm pivot says the frame is 73/74 also..
Click to expand...
Thanks for the info, engine # begins 2022, so could be 1972 or 1973, cant see a visible frame number (paint). I had assumed it was a 72 due to the alloy guards. I'll try and get it going this weekend
 
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