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Post by scoottrash1990 on Sept 18, 2013 15:20:29 GMT -5
well im thinking about doing a full motor build....my scoot is a stock 90 motor so im thinking a aftermarket 90 cylinder and a stroker crank...parts for scooters sells a hoca full circle 43.5mm stroker crank that im looking at....they also sell a hoca 54mm big bore kit that im looking at...has anyone else used these parts....are they any good? would you suggest other parts? thanks...
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Post by 90GTVert on Sept 20, 2013 11:02:38 GMT -5
I have used the Hoca 54mm cylinder. I like it. I've used it on Project 90 and used it for a great street driver 103cc (45mm stroke). It's a good street kit. If you want to do much porting, it's easier with the standard layout cylinders (just 1 exhaust port... Hoca has aux ex ports).
The crank should be good quality, but I've never used that one. Have used a 45mm they used to sell.
This month PFS has code "STILLSUMMER" for 10% off.
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Post by scoottrash1990 on Sept 20, 2013 18:58:49 GMT -5
i went with the hoca 54mm tall cylinder kit....im not going to go crazy with porting...just clean and match some stuff up.....my stock cylinder has the aux ex ports also.....i ordered the 45mm crank from autotech355 on ebay.......thanks for the info..
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Post by scoottrash1990 on Sept 20, 2013 21:50:56 GMT -5
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Post by scoottrash1990 on Sept 24, 2013 18:59:31 GMT -5
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Post by moofus02 on Sept 24, 2013 20:18:22 GMT -5
Nice must be nice to start with 90cc cases lol
Sent from my SPH-L720 using proboards
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Post by scoottrash1990 on Sept 25, 2013 14:27:34 GMT -5
so far its been nice...no boring to fit the cylinder....now im just waiting for the crank to come in so i can see if i need to bore out the cases....
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Post by scoottrash1990 on Sept 25, 2013 15:05:07 GMT -5
quick question....do you guy polish your ports or leave them rough after porting? i have been told both ways so i figured i would ask? thanks
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Post by ryan on Sept 25, 2013 15:12:32 GMT -5
smooth for better air flow
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Post by 90GTVert on Sept 25, 2013 16:31:07 GMT -5
I've polished the exhaust port before, but it doesn't seem to do much. I thought at least it would help a little with carbon, but not for long if at all. Polish the exhaust if you'd like, the rest should just be a reasonably smooth finish. Keeping a little texture to the surfaces is said to create some turbulence and help keep the fuel atomized better than a totally smooth surface.
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Post by scoottrash1990 on Sept 25, 2013 19:17:52 GMT -5
that is what i was thinking but wanted to get some other opinions on what to do...thanks guys.....
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Post by scoottrash1990 on Sept 28, 2013 12:51:01 GMT -5
well i ran into a small problem while putting the engine back together... the plastic cover that goes over the cylinder for cooling will not go back on do to the taller cylinder....its close but no go....has anyone else has this issue? how did you fix it? do they make a taller cover? thanks...
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Post by 90GTVert on Sept 28, 2013 14:17:57 GMT -5
That Hoca head is tall. Mine would basically fit. It clearanced itself (melted). I think I got these from kaseaparts.com, but I don't think they're any longer since this was a shorter cylinder.   |
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Post by scoottrash1990 on Sept 28, 2013 18:31:55 GMT -5
hahaha...that makes it easy....i was able to get it on with a little clearance work but it will still need to do some clearance work its self...hahaha....i got the engine back in the scoot and tried to fire it up but no go...still no spark....i replace the coil but i guess thats not the issue....when i tried to fire it up it hit a few times like it wanted to start then just quit again....i cant find any loose wires....its either the cdi or pick up....has anyone had one go bad before? any way to test these parts?
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Post by 90GTVert on Sept 28, 2013 20:38:26 GMT -5
Check the gap between the pickup and reluctor. Something like a credit card's thickness (.030") will work, down to around .010". Too much gap and they will miss or not fire at all.
I've had CDIs and stators go bad. CDI you need to replace to test. There are specs and test info for the stator in the service manual (follow link in sig).
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