Project beefsalads MC22 rebuild

Of course I wasn't smart enough to find the fische on impex, thanks!

 

Been bashing my head against the wall over these stupid wrist pins. I'm certain I can reuse the ones I have if it comes down to it, but if I'm doing a rebuild why stop here? I did a bit of research and found the mc31 uses the same conrods. That being said the little end diameter has not changed. What has changed on the 250 hornet is the wrist pin part #, as well as the piston part #. Might they work? How the hell would I know. What does the hive mind have to say on the subject? I'm not opposed to finding something of the right diameter hand having it chopped down to size if I can't find a direct replacement. CMSNL is insisting I provide VIN/engine # so they can cross reference. Pretty sure I've done the same thing they would at this point...

 

I've found plenty of non-JDM pins that could be cut down, just trying to save machining costs/time (HAHAHAHA) if possible

 

ebay listing is "made in japan" but ships from china so I'm highly suspect. That part # is for 1986 cbr250f per CMSNL https://www.cmsnl.com/products/pinpiston_13111kt7000/#pageproductModelfit
(mc17) pistons from the same seller look like trash, could be their potato camera but I'm skeptical of anything coming out of China
https://www.ebay.com/itm/175441681962?hash=item28d9239e2a:g:by8AAOSwYcNjQUwK

13111-KT7-751 I is the wrong part # (fat fingered would be my guess). The only reference I find on the webs to it are the post you linked.

13111-KT7-750 is the correct part # for mc22, mc17, mc19

 

Found OEM wrist pins finally! I didn't post about this when I found them so there wouldn't be a wrestle with someone else since they were on yahoo japan auction...

Anyone in the US needs OEM rings or wrist pin clips?

Hopefully going to have the cranks checked out this week. If they aren't in bad shape, going to buy crank bearings. Going to plastigage the rods after dinner tonight to make sure they are still in good shape. If the plastigage says they are install in good shape, going to have them checked out too to make sure they aren't out of shape. Fingers crossed the rests checks out! Otherwise it's probably going to take me a long time to find the rest of the parts.

If everything checks out, sending the cases and pistons to have the cases re-sleeved! In due time though. The woman wasn't too happy coming into my house to find 2 engines on the table We usually cool off around 2-3 weeks from now, that will make it a lot easier for me to get things done and her not eating in the living room. It's not like the cases are dirty, they are just stained, but I digress.

 

I talked to Millennium Technologies (US company) about it, knowing the sleeves are cast in place. I stated my concerns (bore size, thermal expansion, etc...) and they threw a price (quote) at me. I'm leaving the details and alchemy up to them. This is well outside of my wheel house, and they are a very reputable company I trust to do the work. I talked to the local machine shop thats re-bored my klx110 motors and they wouldn't touch it due to the bore size. They had to use a hone to get the klx110 cylinders to size, so I was not surprised. Tempted to troll millenium tech when I do send it by sending them a tiny RC motor a day in advance.

 

I'll go with Milleniums suggestion on materials for the sleeve. If MNG was going with plate the cases, it's likely because he has oversized pistons available, 414&428cc kits. If I were going with chinese oversize pistons it would be a simple bore job.

 

In full ADHD mode today so haven't really gotten anything done, but I did have an "ahha" moment and pulled out the 1-2" mitutoyo mic and made an attempt at measuring the crank. I was surprised, to say the least, that I was getting repeatable results. I use these things about once every 14 blue moons or so. I also realized why I'm not a machinist! Measuring things accurately and consistently is a pain in the ass! There was less than .001" difference on the 1 I measured at 2 different spots 90 degrees apart from each other. I might mess with it again tomorrow and use the vernier scale to really annoy the hell out of myself and screw it all up when I convert to metric. Would be faster and easier to drop them off at a machine shop, but I keep having scheduling conflicts that prevent me from dropping the parts off. The shop that pulled the first rotor has closed, so now I need to track down another rotor puller before I have the shop measure it