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Post by 90GTVert on Nov 18, 2013 22:20:10 GMT -5
Don't plan on pushing the stock crank far past 10,000RPM for long. Sometimes they're fine, sometimes they aren't.
The 41.4mm would fit. If you change stroke you may have to do a little more adjusting to get the cylinder you choose setup just right. The piston will go 1.1mm higher and 1.1mm lower in the bore.
There are a lot of cranks on Racing Planet too. I put a Naraku in Project 49 after I killed it at 10-11K. It was pretty inexpensive, but seemed well made.
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Post by kevin55950 on Nov 18, 2013 22:44:54 GMT -5
Motoforce Evo (all metal full circle) are good crankshafts in a budget. Even better, the Doppler ENDURANCE is also a great choice in a budget (better than motoforce). If you want to build something crazy which revs a lot (or you just want to be safe in case you go farther) the Metrakit crankshaft aren't that expensive for the power and revs they can handle.
I tried some 41.4 setups on 70cc BBK and the only ones who ran fine as-is were the autotech cast iron cylinders. Lower timings with stock stroke means that the timings will not go crazy with a 41.4mm crankshaft. Stage6 sport pro (as-is, with the thick base gasket who came with the crankshaft) needed to rev a LOT to perform well, and it didn't lasted. Only sport pro I made able to run well and last on a 41.4mm stroke used a coat of RTV as base gasket and a standard, non-centering/recessing head like the MK1's.
Full circle crankshafts with plastic inserts will not last the revs like a full metal-full circle crankshaft.
I'd change the crankshaft and bearings+seals for safety and performance, you're better to do everything at once. I don't think you'd like to break a crankshaft no long after installing your brand new engine. Or find you have a bearing which is falling apart. OEM jog crankshaft is tough, but age is there.
Going stroker, IMO, is only worth with a cylinder which is meant for that stroke. Unless you want to epoxy and mod ports, it will be a lot of work to fit a standard stroke BBK on a stroker, maybe not just spacing the cylinder. Generally, the std stroke will perform better than the stroker (with a lower revving setup) on a std stroke bbk just because timings will be way too high on a stroker with mild pipe.
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Post by nelson on Nov 19, 2013 9:16:39 GMT -5
thanks for the info. i will look for a full circle all metal stock stroke.
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Post by nelson on Nov 19, 2013 9:31:11 GMT -5
what about hoca or jaguar powersports? only reason i ask is because i have a amazon giftcard.
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Post by nelson on Nov 19, 2013 11:02:01 GMT -5
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Post by kevin55950 on Nov 19, 2013 11:06:16 GMT -5
replace OEM
Only athena Evo are made full circle, seems to be a remplacement model at this price.
EDIT: I took a look with part number on athena website and it's only a standard crankshaft manufactured by Athena.
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Post by kevin55950 on Nov 19, 2013 11:13:01 GMT -5
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Post by nelson on Nov 19, 2013 12:03:06 GMT -5
Kevin, is that your website? Do you by chance have a amazon seller account? If there is a way you can sell me the motoforce crank i will purchase it. I have a amazon gift card i am trying to use.
thanks
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Post by nelson on Nov 20, 2013 11:33:31 GMT -5
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Post by 2strokd on Nov 20, 2013 11:53:05 GMT -5
No, not IMO it is not. I believe the Leo is better
That pipe is loud as well!
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Post by kevin55950 on Nov 20, 2013 12:38:50 GMT -5
It's not my website it's the website I take most of my parts from, I help the owner also. We don't have any Amazon account  Sad thing with Amazon is that you can't get higher quality parts, like Malossi etc. IMO a LeoVince ZX is a mild pipe best suited for 50cc or mild 70cc. There's a big gap between the ZX and the Yasuni R, for example. Just forget the hoca pipe IMO. Loud, slow compared to other models, rust fast, etc. I had a similar exhaust for my firend's scooter and he wasn't happy with it. With your gift card, instead of trying to get a good crank and pipe, you may try to get a carb, jets, rollers, etc. Some parts like these aren't parts which have a big load on it so it's not a problem if you take a cheaper part, you'll need them anyway once you start tuning it. |
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Post by nelson on Nov 20, 2013 13:24:49 GMT -5
thanks guys. i am going to get the LV pipe on amazon. Kevin, i will be buying the crank from your post above. the motoforce evo. I dont see any good carbs on amazon either |
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Post by nelson on Nov 20, 2013 16:05:26 GMT -5
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Post by ryan on Nov 20, 2013 16:52:33 GMT -5
i have a brandnew hoca set of engine seals if you are looking nelson
and as far as i knew treatland.tv had doppler endurance cranks for sale for 50 dollars email request
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Post by nelson on Nov 20, 2013 17:16:34 GMT -5
i only see the crank with the 12mm wrist pin. i have a bbk kit with 10mm
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