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Post by vg on May 21, 2024 9:22:40 GMT -5
hello to all in 49ccscoot! recently got myself a scooter and have been looking into big bore kits. 72cc, 80cc, and 90cc kits but I've been wanting the 90cc for rhe most gains. I do realize the downside of hurting my reliability when installing the bigger kits, but I really want the most out of my little engine before I eventually swap it out. the engine has about 4200 miles on it, so should go through the bottom end and replace those components as well for maximizing my reliability?
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Post by GrumpyUnk on May 21, 2024 10:57:25 GMT -5
To replace the 'bottom end' parts requires splitting the engine case, disassembling the crankshaft, installing a new rod and pressing the crankshaft back together(using a PRESS!!!) and THEN you get to balance the crankshaft.
I would not do it unless no other option.
OPINION is that a 72cc/47mm BBK will give decent increase. Set the new piston/cylinder next to the original once you have the cylinder head off. There is a good difference.
There is a thread on site about reliability of the different BBKs available, indicating how long they last, etc.
tom
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Post by vg on May 21, 2024 15:47:23 GMT -5
To replace the 'bottom end' parts requires splitting the engine case, disassembling the crankshaft, installing a new rod and pressing the crankshaft back together(using a PRESS!!!) and THEN you get to balance the crankshaft. I would not do it unless no other option. yeah as I thought, I just wasnt sure because my engine has some miles on it, and wanted to be sure it lasts the longest it can. I mainly ride mine for pleasure so its not a daily commuter. I also like to go fast, so thats why i was thinking the 80/90cc would be good |
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Post by FrankenMech on May 22, 2024 8:48:21 GMT -5
Trade the scoot off and buy a 125/150cc or larger scoot.
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Post by averagehillenjoyer on Jun 26, 2024 3:56:19 GMT -5
Go for a 90cc, bigger valves and a A9 cam! if the bottom end breaks just get another used one, theyre cheap
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