slim
Scoot Member
Posts: 24
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Post by slim on Sept 8, 2011 3:11:41 GMT -5
im wanting to either purchase a new 90cc motor from Parts For Scooters for my 05 triton r4 OR i was wanting to building up the motor would it be cheaper to tear down my motor and build it or what any suggestions what will it cost to have the case machined to fit crank and piston anyone in the area that can help me out on this im wanting to build my scoot up were its very fast has good acceleration and top speed parts mod list i want - 99cc bore kit (54mm bore dual ring piston) -preformance crank -18mm or bigger carb (thinking a delorto carb) -better clutch with springs -better variator -possibly torque spring) -pirelli tires -preformance intake with better reed and wanting to stay with stock airbox but we'll see been told better to just get a better air filter in my airbox - better exhaust thinking a leovince pipe can anyone tell me how to port and polish it if i decide to just mach up and build my motor how can i beef up front suspension ive been told need better forks when putting power into scooter ******im really wanting to stretch my r4 like 4-5" can anyone help me on this not sure i want it to be strong and safe at high speeds is it possible to stretch it and be safe at 60-65mph i wanna make scooter fast is this scooter gonna be reliable overall  ? i want a super fast scooter would it help to get a non stroker crank? what can i do i drive my scooter like 60 miles a day or more so its gotta be reliable  considering auto355 off ebay for parts hows their 54 with crank kits??? and other parts he sells |
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Post by 90GTVert on Sept 8, 2011 6:25:13 GMT -5
Since you want to go to a larger bore and crank, it should be cheaper to DIY. That will depend a lot on how much the machine shop charges to clearance the cases. I ended up paying out $280 to clearance the cases and make the crank fit. My crank had to be machined down, so you would end up paying out less getting the right crank and I think most shops would be significantly less than what I paid anyway. If you get the Parts For Scooters motor you won't need the cases machined for most cranks, but you are then paying for the crank, cylinder, and CVT stuff that you aren't using. I suppose you could offset the cost by selling off those parts and selling off the stocker though. Go through the Project 90 thread HERE. That will cover porting and show DIY case clearancing and other mods. You shouldn't have much of a problem making it fast with good acceleration with the big motor. I'd go straight to 103cc with a 45mm crank and 54mm bore if you decide to build yours up. The 45mm crank shouldn't be any more than the 42mm cranks. If you buy a 90 you could stick with the stock crank to save some money and go with a 54mm kit to make 96cc. If you'd rather not do the porting yourself you might want to go with the Hoca 54mm kit. It's better setup out of the box than the Autotech and other single exhaust port kits. If you want to do the porting yourself, it's gonna be easier with the single ex port kits. With either the 42 or 45mm stroke, 54mm cylinder (Hoca or ported other), aftermarket vari, 2000RPM clutch springs, 21mm DellOrto (largest carb that fits easily in place of the stock carb, works with stock airbox and intake), a pipe, and proper tuning you should be able to have a reliable engine capable of 60MPH or better. I've never replaced the forks on either of my Tritons and both have been ridden at 70MPH. Some people will tell you you shouldn't ride a Chinese scooter at 30MPH because the front suspension will break in half or something.  I'd say just make sure it's setup to your liking for firmness (more or less fork oil) and remember how fast you're going when that turn is coming up. If you really want it to feel a lot better for turns, make a frame brace. Make sure your brakes are in good condition, bled, and adjusted. Autotech355 on eBay, Parts For Scooters , and kaseaparts.com are all good suppliers of 90cc stuff that I use regularly. One plus about ordering a kit including the crank and cylinder kit from Carlos is that you know you have the right cylinder for the crank. The cylinders come in a couple of setups intended for different strokes. |
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byte
Scoot Member
Posts: 51
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Post by byte on Sept 8, 2011 15:10:48 GMT -5
IMO, I think putting in a BWS 100 cc engine will be easier for this guy. Will it fit Brent?
BTW, superfast vs reliabilty in a scooter? Just choose one.
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Post by 2strokd on Sept 8, 2011 16:05:07 GMT -5
It will fit pretty easy, its getting a BWS 100 in the US thats the problem...
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Post by 90GTVert on Sept 8, 2011 17:14:42 GMT -5
IMO, I think putting in a BWS 100 cc engine will be easier for this guy. If you've got a source for BWS engines at good prices PLEASE let us know. Just depends what super fast is defined as or relative to. A 90-100cc properly setup is super fast in comparison to a stock 49cc and can be very reliable. |
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byte
Scoot Member
Posts: 51
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Post by byte on Sept 8, 2011 22:54:39 GMT -5
:thumb:
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slim
Scoot Member
Posts: 24
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Post by slim on Sept 9, 2011 0:12:49 GMT -5
i was thinking be alot better as far as reliable if i just preformance crank and not get stroker i want the preformance crank cause better than stocknot as easily as factory crank as far as reliable what does that usually mean such as top ends? ? |
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slim
Scoot Member
Posts: 24
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Post by slim on Sept 9, 2011 0:14:40 GMT -5
has anyone ever stretched a triton r4 before??? im wanting to just do a small strech 4inches and really want a bit wider tire is it possible? any ideas on how to |
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Post by 90GTVert on Sept 9, 2011 6:09:24 GMT -5
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Post by 90GTVert on Sept 9, 2011 6:46:41 GMT -5
i was thinking be alot better as far as reliable if i just preformance crank and not get stroker i want the preformance crank cause better than stocknot as easily as factory crank as far as reliable what does that usually mean such as top ends? ? First, you probably aren't going to wanna use a stock stroke performance crank. None of the large 50-54mm cylinders are setup for that stroke. That means all of your port timings will be off and you will have loose squish clearance (low compression) unless you do some machine work. A stroker motor can be reliable. While it's a stroker motor to us, they are stock in some scooters (my Mexican Triton came stock w/ an 89cc) and companies like Polaris and Eton used 90cc minarellis in their youth ATVs with much success. As long as you do the case machining and setup properly, there shouldn't be an issue. The main thing that I can think of that's worse on the strokers is the wear at the bottom of the cylinder. The stroker cranks will put the rod at more of an angle at the bottom of the cylinder walls and can cause more wear because of it. Luckily most stroker cranks have an 85mm connecting rod instead of 80mm like stock so the rod angle is a little better than it would be otherwise. Stock rod ratio (80mm conrod/39.2mm stroke) is 2.04. A 45mm stroker crank with an 85mm conrod has a rod ratio of 1.89. Lower ratio = higher angle. Taking it off paper and into real world experience, it hasn't been that much of an issue for me. I do seem to notice more wear at the bottom of the big motor's cylinders, but this is over many miles. If reliable to you means holding together for 20,000 miles you might wanna just ride a 50. Of course then you aren't gonna be real fast. With these small engines there tends to be at least some sacrifice one way or another. One of mine went 7,000 miles on the cylinder (8,000+ on the crank) before it failed. I think the cylinder woulda been fine a little longer, but the stock stroker crank was worn out. Another I'm running now has at least 5,000 miles on it (not sure, I didn't keep accurate track of it) and I've never had it apart since I got it setup right. One bright side of a stroker for reliability is that you don't have to push them so hard. A 50cc has to rev to make power. A 90-100cc can be setup to keep the revs lower (can also be setup to rev if you prefer). Much more torque with the larger cc engines. This makes it easier to keep it stealthy too. You can set up a stroker to rev out to something like 9000RPM and use a quiet street pipe like the Phongeer or YMS V8 that will make good power there and no one will have to know it's anything more than stock till they catch you speeding. ;D |
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Post by reveeen on Sept 9, 2011 8:14:30 GMT -5
Probably you are the best judge if you should buy, or build?
Time, money, tools and equipment=build
Time (less), money (about the same), less tools and equipment=buy
Do you have a spot your scooter/parts can lie about for weeks undisturbed?
From what I understand the 90cc engines are pretty mild right out of the box, this is good and bad, good for reliability, bad for racing about.
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? i want a super fast scooter would it help to get a non stroker crank?
