I sure this has been covered here before but I'm having a brain fart and can't find it.
I'm installing a new 70cc kit on my air cooled Minarelli horizontal, the new base gasket matches the cylinder exactly but the port areas on the new cylinder are larger than the case opening areas.
I'm pretty sure that things would work better if the cylinder matched the case but I'm not sure how much grinding needs to be done. Do I just knock the corners off? Do I grind a 45 degree angle back to the edge of the gasket line? Take all of the metal out straight back into the case?
And, is this something I can do without splitting the case? or is there a way to keep all of the debris out of the engine that I can't think of?
Basically straight back. You wanna make sure it's a smooth transition from the case up into the cylinder. You can try to stuff the case with a rag or something the best you can. Flush it out very thoroughly afterwards, even if you don't think anything got in there.
Kudos for paying attention to detail on your first build. I pretty much just slapped my first BBK on and rode. lol
Cool Ben, your building a 2T :cheers: ! Looks to be a genuine Yamaha or equivalent Minarelli to. Good one!
I was able to match a case somewhat while still together but i didnt go all the way to the crank in fear of getting metal in the case and bearings. It would be best to split the case IMO. And if you go that far you might as well put a better crank, bearings, and seals in . Like Brent said, you can blend it better with the cases complete. I took my reedblock out and stuffed a wet rag in the case as tight as i could. When i was done, i pulled it out of the front (cylinder) side of the case. Good luck, should be a fun build :riding:
Turn on the shop vac, put on safety glasses and grind away. So far it looks like it's working awesome, I can't see any shavings inside the case and from the amount of glittery dust I'm finding everywhere else in the garage I can't imagine too much made it inside. :rockon:
Still a little more to go but here's where we stand right now.
Senna1Rossi: Thanks renagade281!
May 23, 2016 14:59:12 GMT -5
Fox: I don't really know how to say this but straight. I am Dave's Girlfriend Kellilee and bluntly and VERY SADLY he passed away early Tuesday morning. I know he would want ya all to know this. Thank You Brent for befriending my love he was very happy on here!
Jun 18, 2016 16:26:04 GMT -5
Fox: www.gofundme.com/29mgf6b8 I hope it is ok to pass on his gofundme page link. If not you will un-post it I'm sure. Thanks again all!!
Jun 18, 2016 16:31:18 GMT -5