tj
Scoot Member
Posts: 56 
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Post by tj on Mar 29, 2015 7:21:32 GMT -5
I have done all the nescarry changes IE iridium plug ncy trannkit, 144 mm stroked crank and a new 50mm Bbk . Found loads of power then One monrning on the way home from the office it just died. Had to push the SOB 1/2 home. Got it home and it cranked right ip changed oil looking for WOMD!!! and it looked good. My only thing or reason I csn think is that the bike was at 8000 for 20+ minutes straight. Desperate in denver bout to just say f it and by a real bike. So tired of dropping $$$$ in this thing when I'm Just gonna sell on cL for 700.last chance fix! Please help!!!!about to get a new ktan 390 duke
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tvnacman
Scoot Enthusiast
Posts: 408
Location: NYC
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Post by tvnacman on Mar 29, 2015 8:11:39 GMT -5
richen up the mix.
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Post by 90GTVert on Mar 29, 2015 10:53:55 GMT -5
If all is well there's no reason you can't run around at 8000RPM for 20 minutes without it dying. First thing is to check your carb tune, could be too small of a main jet. Also make sure there are no intake/vacuum leaks.
Hopefully all cooling shrouds and the fan are installed and in good condition.
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Post by humanshield on Mar 29, 2015 12:56:53 GMT -5
If you're in Denver the air is thinner so you'll probably be running smaller jets than normal.
Please post your jet sizes for reference.
At this point it seems you have absolutely no clue what happened.
If you had been able to pull the plug right then before you ran it again it "might" have given a clue. But not necessarily.
Since it started up and ran again it seems it wasn't anything catastrophic so that's good. I guess it could have over heated and seized. Again a plug reading at that time would have been very helpful. Could be the fuel flow became restricted for some reason. Could be a piece of debris got sucked up and blocked the air intake, then fell back out. So many could be's.
Run a compression test. Make sure it's not running lean and check all your fuel and vacuum lines carefully again.
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tj
Scoot Member
Posts: 56
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Post by tj on Mar 29, 2015 21:00:13 GMT -5
I was running an 82 main jet since then I put in an 85 main jet and its running a little rich. I drove it to work again today and it ran fine. I didn't push it hard stayed around 7-7500 rpm. I spoke to a scooter shop they said they usually run around an 82 main jet. Just getting frustrated. The plastics are fine and I just replaced the rubber gasket around the head a few days ago. I made a intake shroud one like you made, i made it with a 3" S&D 90 elbow. I kepted it at 90 degree angle the 1st run i made with it is when it quit on me. I have since cut it at a 45 degree. Maybe with it being at a 90 the body of the scooter was making a void where air couldn't come in idk... but its working better now i think since it didn't die on me today and it didn't smell hot or anything. Has anyone ever ran 100 octane or is it bad to run that high of octane in the scooter? I have a local gas station that sells 100 octane race fuel at the pump and thats what I have been using since I put in the stroker kit.
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Post by scooterpimp on Mar 30, 2015 4:57:50 GMT -5
100 octane is kind of a waste of moola in a scoot imo. Lose the homade air elbow scoop if causing it to overheat.
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Post by stevec on Mar 30, 2015 20:12:54 GMT -5
NCY makes a nice cold air intake you can use instead of a makeshift tube. make sure you are not running too lean, do a plug chop. look around for a good performance fan to replace the cheap stock one, a good fan will look like the one you have except the fins will be turned different. 8,000rpm for long periods is rough on a new engine, there is an awful lot of friction before the rings break in which will generate a lot of heat. my stroker engine runs great on 93 octane, 100 octane is way too expensive. 44mm stroker crank kicks ass with a 50mm piston especially once it breaks in. s40.photobucket.com/user/pcdj64pcdj64/library/Progress%20Pics?sort=6&page=1one of the pics shows the NCY cold air intake. |
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tj
Scoot Member
Posts: 56
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Post by tj on Mar 30, 2015 21:42:28 GMT -5
well the intake to the motor is free flowing just attaching to the carb. The 100 octane with it being expensive was just a impulse descision. Didnt know the price till I had already bought 9 gallons of the stuff. Found out it was $9 a gallon after I bought it... With the 44mm stroker crank did you have to add an extra gasket to the jug? If you did, did you add an extra head gasket or base gasket? Increased the jet and on my way home started doing the same thing with horrible power, barely made it home.
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Post by stevec on Mar 31, 2015 2:52:46 GMT -5
the engine i have has a taller jug and longer cam chain to allow for the stroker.
put the other jet back in if it wasn't too lean, it seems like it may be due to running too hot.
the fuel mixture would not make it lose that much power after warming up unless it is seriously lean.
i would try am upgraded performance fan, i had to upgrade my fan to keep it cool.
i am pretty much at the max allowed for CC's without having to go with an oil and liquid cooler.
where did you get the 50mm kit? if it is an inexpensive one the rings can get heat soaked.
if you are running the 100 octane try switching to 93 and see if it helps it to run cooler.
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