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Post by 190mech on Sept 16, 2009 19:52:56 GMT -5
While waiting on parts,I've been reading forums and thinking.. My project scoot was bought as a "basket case",odometer read around 8000 miles,saw some posts that say Minerelli cranks being short lived with 70cc kits.Just wondering with that much milage,should I think about splitting the cases for a bottom end refurb??As with most of us I'm on a limited budget,so a deal is what I look for,,Heres one of them; cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=290348460252&viewitem=&sspagename=STRK%3AMEWAX%3AITWhat do you guys think? |
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Post by 90GTVert on Sept 16, 2009 20:10:41 GMT -5
I haven't heard a whole lot about life expectancies for bearings with 70 kits. You'll probably be alright for a while. If you are up for the job it would be nice to know your bottom end is straight and very cool to up the displacement.
You have to machine the cases to fit the bigger crank. If you are going to go that far, you should bore the cases so you can get a 52-54mm cylinder kit as well. Some of those are designed to work with bigger cranks so you may not have to mess with spacers. I know budget is a concern, but I think it would be worth waiting for extra cash to move straight from 70cc to around 100cc. You will need to mod that pipe of yours and you might need to up the carb size.
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Post by 190mech on Sept 16, 2009 20:23:56 GMT -5
I have a vertical mill at work and boring the cases would'nt be a big deal.I thought the 70 cyl would work with a spacer?I could hog out the case mouth for a bigger jug,but thats a bit over the thin budget.Hoping to find a junker Minerelli clone to build up
while I can still ride my scoot!
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Post by 90GTVert on Sept 16, 2009 20:42:46 GMT -5
70cc should work with spacers. Just be careful tuning. I soft seized mine numerous times before realizing the stinger on my pipe was too small and making me run hot.
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Post by stepthrutuner on Sept 16, 2009 21:41:21 GMT -5
Wow. That's awful cheap for a new crank. I'd be kind of weary just on that basis alone. Wish I had more input but you could be taking a chance. Believe me, I understand budgets. My advice is to bide your time and do more research. The only trouble is the falling value of the dollar lately making foreign parts more expensive by the day.
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Post by 190mech on Sept 17, 2009 4:41:40 GMT -5
Thanks guys,I think I'll work with the stock bottom end until it
gets tired and keep looking for a spare engine and a proven
stroker crank.
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