CBR 125 08 WONT idle after rebuild. Cylinder get very Hot!

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02-15-2019, 11:39 AM

Samways225

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CBR 125 08 WONT idle after rebuild. Cylinder get very Hot!

So I just done a fresh rebuild top and bottom, I've triple check everything's all good in side.
i filled the radiator up and left the cap off and started her up and it idle at first for about a minute or 2 then cuts, after that will start but only if revs pinned above 1.8k the hotter it get the worse it gets.

I took it apart and notice the intake side of the pistion had some like scuffs but nothing major, mainly superficial.
I assuming I'm going wrong somewhere with the cooling system?
After putting it back together today and having the same result.
Any suggestions will be greatly appreciated

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02-16-2019, 12:13 PM

wes 17

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Your thread title and symptoms don’t sound encouraging to me I’m afraid.
After she has cut out, does it struggle to turn over or fire up at all ? The reason I ask is paired with your cylinder getting very hot it sounds to me like it’s seizing. A nipped ring could soon develope if it hasn’t already.
Have you examined your water pump components.
Best of luck mate

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02-18-2019, 05:31 PM

ceebeeaarguy

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it won't overheat in 2-3 mins if only the cooling system is at fault. As wes says above, something wrong with the rebuild? Remember with internals, especially pistons/cranks etc there's no such things as slight/superficial scuffs...

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