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CBR 125r Top End Rebuild / Freshening https://www.cbr125world.com/forum/viewtopic.php?f=18&t=29 |
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Author: | mmiller [ Tue Mar 25, 2014 7:08 pm ] | ||||||
Post subject: | Re: Top End Rebuild / Freshening | ||||||
The engine is so small and light it's remarkable (for someone coming from the automotive industry). You are literally carrying an engine/transmission & starter with no real strain. It's size also means you can just put it on your desk and sit upright in comfort while working on it. This is no small benefit :) No engine stand required...
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Author: | mmiller [ Tue Mar 25, 2014 7:10 pm ] | ||
Post subject: | Re: Top End Rebuild / Freshening | ||
A better pic of the new cylinder.... BTW, I've always been of the mindset that any new/modern engine does not need a break-in period. Certainly, in the modern automotive industry this is true. This is largely due to the fact that modern machining of the cylinders typically means they are precision bored and honed to a fine degree. The smoother you hone the cylinders the less break-in period is required. To my surprise I found the OEM Honda cylinder to be fairly 'coarse' and sure enough, it was clear that there is a break-in period required before the rings & cylinder mate in. The engine was noticeably 'tight' post-re-build until I put a few thousand K on it. In fact, on a cold start, it went back to OEM-style requiring two starts before it kept running. The bike had done this when new, so this was normal, but as it wore and the friction was reduced one start was sufficient. A poor man's compression test? Perhaps
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Author: | mmiller [ Tue Mar 25, 2014 7:10 pm ] | ||
Post subject: | Re: Top End Rebuild / Freshening | ||
Cylinder head after a 'quick & dirty' cleaning job with new springs and seals.
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Author: | mmiller [ Tue Mar 25, 2014 7:10 pm ] |
Post subject: | Re: Top End Rebuild / Freshening |
What I regret not doing is going after my 5th => 4th gear downshift 'crunch' that's plagued this bike since the day I bought it. It's intermittent and annoying. In fact, I suspect that's where the majority of the metal comes from that I find on the drain plug every oil change. Thing is, to do that I need to split the case and I'm certain I'll need to order a few parts to clean up the transmission side of things. If I'm going that route I'd rather also change out the crank & balancer and bring it out to an OEM 150cc model. |
Author: | grenadiers [ Tue Mar 25, 2014 7:11 pm ] |
Post subject: | Re: Top End Rebuild / Freshening |
Is that a stock cylinder? Or did you go the BBK route... Cheers! |
Author: | mmiller [ Tue Mar 25, 2014 7:11 pm ] |
Post subject: | Re: Top End Rebuild / Freshening |
Grenadiers wrote: Is that a stock cylinder? Or did you go the BBK route... Cheers! No, it was new OEM, as I wanted a true to factory test vehicle for dyno testing. ie. I needed a fresh stock baseline to measure successive modifications against to highlight increases or gains and it had to be real-world accurate as compared to a regular rider with a CBR125 |
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