kawiking Posted October 6, 2007 Report Share Posted October 6, 2007 i was at my local atv shop today. owner has put together of 421 4mill cub motors, he was working on a bike today that was a 435 4mill...... he said u an order them like that. is anyone running a 435 4mill ? Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted October 6, 2007 Report Share Posted October 6, 2007 that would be a 69mm bore and a 4mil crank. i havent seen anything like that for sale. Quote Link to comment Share on other sites More sharing options...
kawiking Posted October 8, 2007 Author Report Share Posted October 8, 2007 this local atv shop ,said this is the second one he's built. Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted October 8, 2007 Report Share Posted October 8, 2007 thats new to me. i have never seen a 69mm bore cub. 68 70 and 72 Quote Link to comment Share on other sites More sharing options...
kawiking Posted October 8, 2007 Author Report Share Posted October 8, 2007 i guess i'll call and ask him what it is..... he said it was the biggest before you had to trench it,i guess as in trenching ur cases???? but then that wouldnt be a 4-mill ??? i'll call tommorow, and get my story stait....and post what it is . Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted October 8, 2007 Report Share Posted October 8, 2007 i guess i'll call and ask him what it is..... he said it was the biggest before you had to trench it,i guess as in trenching ur cases???? but then that wouldnt be a 4-mill ??? i'll call tommorow, and get my story stait....and post what it is . yea you might want to find someone else to do business with. Quote Link to comment Share on other sites More sharing options...
kawiking Posted October 8, 2007 Author Report Share Posted October 8, 2007 lol !! i dont do bussiness with him, just never heard of a 435 cub...... Quote Link to comment Share on other sites More sharing options...
badassbanshee479 Posted October 8, 2007 Report Share Posted October 8, 2007 there are a couple company's out there re sleeving the cub cylinders and boring them out bigger. dont know if there are pistons made that size or not though. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted October 8, 2007 Report Share Posted October 8, 2007 Trinity will get you just about any size of piston you want... cases aren't "trenched" for bigger bores, they're machined.... Cases are trenched for cranks with a longer stroke than 4 mil...so the lower rod doesn't scrape. You can get cubs with the nikasil, which I'd have to say is hands down the favorite, or unplated to accept a sleeve. Once you go bigger than 68 or 70...you do have to machine the cases for a bigger bore. I don't know of anyone running a 70mm piston, but I know the super cubs are 72mm, and the cases have to be machined to accept the bigger bore... With sleeves, anything is possible... Quote Link to comment Share on other sites More sharing options...
shanYE west Posted October 8, 2007 Report Share Posted October 8, 2007 Trinity will get you just about any size of piston you want... cases aren't "trenched" for bigger bores, they're machined.... Cases are trenched for cranks with a longer stroke than 4 mil...so the lower rod doesn't scrape. You can get cubs with the nikasil, which I'd have to say is hands down the favorite, or unplated to accept a sleeve. Once you go bigger than 68 or 70...you do have to machine the cases for a bigger bore. I don't know of anyone running a 70mm piston, but I know the super cubs are 72mm, and the cases have to be machined to accept the bigger bore... With sleeves, anything is possible... It wasn't a cub but my stock cylinders had BB sleeves and I could bore them to 70mm Quote Link to comment Share on other sites More sharing options...
kawiking Posted October 9, 2007 Author Report Share Posted October 9, 2007 ok ,called and asked..... 69mm lightened piston, it is a cub cyln. it only takes a trinity head( not centered up )..... local guy said there's only about 10 out right now. you have to get threw trinity. port timing and everything else the same. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted October 9, 2007 Report Share Posted October 9, 2007 Calvin @ CP has been known to make a few odd ball cylinders to compete with certain size requirement classes for organized racing, my guess is this one fits in a 450cc and under class...I think a 7 mil is JUST over that, as is a 10 mil. Quote Link to comment Share on other sites More sharing options...
bada450r Posted October 9, 2007 Report Share Posted October 9, 2007 yes a builder can bore the cubs to a 69 mm bore,when i send my cyls to lynn at lc performance he asked if i wanted to go a bit bigger[69 bore]i said no cuz the only place that would have that size piston was going to be trinity.i also for some reason think that 68 bore would be more reliable than a 69.also i think a set of 69 mm pistons are like 220 or oround that price range. :: :yucky: Quote Link to comment Share on other sites More sharing options...
kawiking Posted October 10, 2007 Author Report Share Posted October 10, 2007 he told me you'd have to run a trinity head because it was off centered. why would that be ? Quote Link to comment Share on other sites More sharing options...
06BaNsHeE Posted October 10, 2007 Report Share Posted October 10, 2007 ok ,called and asked..... 69mm lightened piston, it is a cub cyln. it only takes a trinity head( not centered up )..... local guy said there's only about 10 out right now. you have to get threw trinity. port timing and everything else the same. Yea but a 7mm would be a 443.Then a 10 would be 465.Maybe he stuck a sleeve in it :shrug: Quote Link to comment Share on other sites More sharing options...
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