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Post by imarider on May 30, 2013 9:06:47 GMT -5
Hi all
My project is going to start with a 139qmb long case engine with a fresh crankshaft and oil pump installed. The topend needs to be rebuilded and there is where my questions begin. I would like to get some input into which bore kit to install. It's going to be a 50mm kit i put in it. The engine also doesn't come with the cvt compontents in it so i'm looking for a good clutch set-up. All will be put on my jonway 50 with 10" tire so it will be changed to a 12" rear tire. Plz give input on experience and ideas.
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Post by sailracer on May 30, 2013 10:13:11 GMT -5
Don't run with a 12" rear and 10" front. I have an older baja sc50. I put a long case and a 12 " tire on it . It was unstable, so I changed the whole front end ( forks and all to a 12". Much better
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Post by onewheeldrive on May 30, 2013 15:02:20 GMT -5
Make sure the crankshaft oil pump sprocket matches the oil pump and gear that you have now. I'm only aware of the 16 and 22 tooth. Just count the teeth. Most sites don't label the specs, or label every spec besides that.
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Post by woowilly on May 30, 2013 19:57:08 GMT -5
read up on front end rake angle and front tire contact patch trail if you want to mix tire sizes.
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Post by ej132 on May 30, 2013 21:40:43 GMT -5
So far I would recommend scrappys, not done yet but quality and machining look real good.
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Post by imarider on May 31, 2013 6:38:12 GMT -5
I'm going to be re-using my 10" tires until i get front forks and a 12" front tire. I'm thinking of getting a cheap e-bay 100cc kit w/gaskets. And going to be reusing my hoca head aslo with a 24mm carb set-up.
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Sophomore Rider
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Use the force, if it breaks,it nedded to be fixed anyway!
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Post by Tripper on May 31, 2013 7:26:35 GMT -5
Scooter parts international, Airsal 50mm bbk, its aluminum! Not korean pot metal! Like the one on ebay. Nickle plated jug. $67 with shipping. Pay the $10 extra! , get two! I'm gona get anotherone just to have in a couple weeks.
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Post by imarider on May 31, 2013 18:26:27 GMT -5
The engine i'm building i want it to be as strong and fast as the current set-up i have now.
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jet
