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Post by B. A. M. F. on Apr 4, 2013 21:49:42 GMT -5
So I blew a (or the, I dunno ) crank bearing on my df50tka and i hate working on the bottom end of any engine so im gonna just buy me a crate motor. Ive done alot of searching and my best option seems to be the 100cc long case from scrappys. Only thing is they say its for drum brakes and mine is disk in the rear. Ive herd people tell me to make sure to get the right one but that didnt make alot of sence to me because my disk brake is on the oppisite side of the wheel than the engine. I made the assumption its because if it had drum brakes they would be located in the case itself, and after watching some videos online that seems to hold up... Thing is on those vids and you see the case with the back tire off, it all looks pretty much the same except the brake shoes. I am going on memory here from when i replaced the back tire a few months back, but to me it looks the same but i remember a bunch of spacers in there instead. The serches ive tried mostly bring up drum to disk conversion kits which entail the disk brake (obviously) a new rear wheel (understandably, sence the shoes make contact with the actual wheel (from what I can tell) and i dont think my wheel has that space in it to fit around the shoes) spacers, and some people claim i need to do "case modification" (whatever that means) I am thinking that the factory of this scoot just took a regular drum brake motor, deleted the shoes, and added the parts to make it disk, like the conversion would. Sence i have those parts it should work for me. Am I wrong? Does anyone know if this engine will work for me? Or if not if not is there a way to make it work? Or should i look for something else? Any insight at all helps. You guys rock!
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Post by skuttadawg on Apr 4, 2013 22:00:57 GMT -5
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Post by skuttadawg on Apr 4, 2013 22:03:08 GMT -5
Call first as they may not have a or 100 Job engine left
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Post by B. A. M. F. on Apr 4, 2013 22:45:27 GMT -5
I have a 4 stroke and the disk brake is on the other end what i will call the axle. Tthe shaft that connects the cvt to the wheel. but it runs through the wheel and on the other end is the gizmo that runs the spedo/tach, then the disk, then the bracket(s) that holds the exhaust on.
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Post by B. A. M. F. on Apr 4, 2013 22:50:24 GMT -5
[replyingto=skuttadawg]skuttadawg[/replyingto]
and yes, they are on backorder for a couple weeks.
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Post by skuttadawg on Apr 4, 2013 23:12:24 GMT -5
My scoots have the rear rotor on the left side instead of the right side next to exhaust which heats up the brakes
So you have a 4T and want to use Scrappys 2T 100 JOG engine ? The mounts are way diff and it will not bolt in . You would have to do custom metal fab and welding which could weaken the frame and we know China metal is so soft compared to that made in the USA .
This is for a reverse trike ? Does it have a reverse or just a CVT like most ? If no reverse then I would look into getting an ATV engine with reverse . Some may only have F , N and R where others have forward gears to shift with semiauto clutch
No Scrappy does have 80+ 139QMB ctate engines . You would need to know if you have a shortcase or longcase . Unsure on RTs but scooters 10 inch wheels is short case and 12s and up longcase . You would also need to know if the crate engine had the same amount of poles in the stator so it would wire up as some cases would need a need voltage regulator to match the stator if its not the same
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Post by B. A. M. F. on Apr 5, 2013 7:16:09 GMT -5
I was under the impression that the 100cc they have for sale was a 4t qmb. I don't want 2t. How can I tell the diffrence in the staters?
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Post by teddy554 on Apr 5, 2013 7:29:44 GMT -5
Yes the have a 4t 100cc (85ccc)long case 139qmb motor on there site under 4t performance and you should be able to convert it to disc brakes might have to swap some part off your old motor
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Post by tvnacman on Apr 5, 2013 7:43:58 GMT -5
I did the conversion on a 16" wheel 150cc .
John
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Post by chihuahuas on Apr 5, 2013 8:35:41 GMT -5
This is Scrappy's 100cc 139qmb. it comes with the extra long shaft. Should work, maybe not, you may need to use your gear set on the new motor so keep it, don't throw it out. As far as changing out a crankshaft, after you drain the oil and pull the engine, get a flywheel puller and impact, removing and replacing the crankshaft is easy. My first crank loosened up at 9000 miles, I swapped in a used one. Ran it 6000 miles. It came loose. I swapped in a Scrappy's new crank and 47mm bore.
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Post by justbuggin2 on Apr 5, 2013 19:35:56 GMT -5
it is easy to swap the out put shaft for the rear wheel on these things all you need to do is open the gear box and pull to old shaft out and slide the new one in
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Post by tvnacman on Apr 5, 2013 21:16:07 GMT -5
I would replace the crankshaft .
John
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Post by justbuggin2 on Apr 5, 2013 21:54:20 GMT -5
ok if he replaces the motor with a crate motor why in he** does he need to replace the crank?
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Post by skuttadawg on Apr 5, 2013 23:29:51 GMT -5
I agree a new engine should not need a crank .
So has anyone converted a LC to a SC or vice versus ?
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