Fastassbanshee96 Posted August 5, 2013 Report Share Posted August 5, 2013 Ok so I am finishing my drag build. It's a 485 cheetah. While waiting on some front suspension to cone in I figured I would try to fire it. It on m1 alky with bean oil running 32-1. Timing is +7 and carbs are 39pwks with 120 dumps 124 main and 60 pilot. Pjs are wide open. Needless to say I got it to fire and seemed to be running fine. I blipped the throttle a few times but nothing crazy. It only ran for maybe a min before it shut off on its own. Went to try to restart it but the kicker or motor is locked. Took the head off and everything looks to be ok, no big gouges or deto or anything a bad the domes are covered in alky. Haven't pulled the clutch cover yet but does anyone have an idea on what could have happened? I'm supposed to be racing in 1 week so trying to get this figured out. Please let me know what you guys think. Quote Link to comment Share on other sites More sharing options...
WINDYCITYJOHN400 Posted August 5, 2013 Report Share Posted August 5, 2013 I don' t remember.....was yours a Trinity kit? Quote Link to comment Share on other sites More sharing options...
Fastassbanshee96 Posted August 5, 2013 Author Report Share Posted August 5, 2013 It's a 485 cheetah which they do but I bought the motor used in pieces so I'm not sure if it was one of there kits to start with or not. I built the motor though. Quote Link to comment Share on other sites More sharing options...
Calderon Posted August 5, 2013 Report Share Posted August 5, 2013 When mine just lock like that it was my crank bearing that broke and it just shut down. So I had to replace my crank Quote Link to comment Share on other sites More sharing options...
Calderon Posted August 5, 2013 Report Share Posted August 5, 2013 When mine just lock like that it was my crank bearing that broke and it just shut down. So I had to replace my crank Quote Link to comment Share on other sites More sharing options...
Fastassbanshee96 Posted August 5, 2013 Author Report Share Posted August 5, 2013 This was the very first time fired the motor. I'm really hoping its not the crank. I'm going to pull the cover and see what's going on in the. Hoping its just a kicker gear or something. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted August 5, 2013 Report Share Posted August 5, 2013 Normally you should run 20:1 on premix but I don't see that being the issue if you just ran it once,did you purge the motor after running it?take clutch cover off and see if kick starter blinded up.good luck Quote Link to comment Share on other sites More sharing options...
WINDYCITYJOHN400 Posted August 5, 2013 Report Share Posted August 5, 2013 Did you check the piston to cylinder wall clearances top, mid and bottom? I had a cylinder with seizure tight clearances as the piston got to the bottom. Luckily I caught it on assembly. (Trinity doesn't do quality control inspections on the bores.) Quote Link to comment Share on other sites More sharing options...
Fastassbanshee96 Posted August 5, 2013 Author Report Share Posted August 5, 2013 Normally you should run 20:1 on premix but I don't see that being the issue if you just ran it once,did you purge the motor after running it?take clutch cover off and see if kick starter blinded up.good luckThis was the first time I've ever even started the bike. It ran for about 30-60sec before it shut off on its own. I didn't get to purge it due to it not running. How long can it go without purge before doing damage? Quote Link to comment Share on other sites More sharing options...
Fastassbanshee96 Posted August 5, 2013 Author Report Share Posted August 5, 2013 Did you check the piston to cylinder wall clearances top, mid and bottom? I had a cylinder with seizure tight clearances as the piston got to the bottom. Luckily I caught it on assembly. (Trinity doesn't do quality control inspections on the bores.) No I have not checked the bore. This was a running motor before I got it. My friend had bought it and torn it down to be sent out and checked. He then sold it to me and parts were shipped to me from builder. Quote Link to comment Share on other sites More sharing options...
Fastassbanshee96 Posted August 5, 2013 Author Report Share Posted August 5, 2013 I took the clutch cover off and didn't see anything wrong so I took the clutch out to check the gear on the back and it was fine. I tried putting a socket on the nut that goes to the crank(what ever that gear is called) and turn it and spun fine. Upon putting back together I notice the nut and washer had fallin off the pancake bearing. Could that have had something to do with it? I also didn't check when first putting together or tearing apart but I don't believe the arrows on the inner and outer hub were lined up. The clutch lever was a bitch to pull and now it's nice and smooth. Quote Link to comment Share on other sites More sharing options...
WINDYCITYJOHN400 Posted August 5, 2013 Report Share Posted August 5, 2013 If you have nuts coming loose.....sounds like it's time to check everything a second time. Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted August 5, 2013 Report Share Posted August 5, 2013 Hey Fastass.....when it shut off.....did it sound like it stumbled then stalled or did it sound like it locked HARD......just curious as it may help with the diagnosis.... And where do you ride at? Im in Fraser and ride in Mio. Jereme Quote Link to comment Share on other sites More sharing options...
Zillaguy Posted August 5, 2013 Report Share Posted August 5, 2013 Hey Fastass.....when it shut off.....did it sound like it stumbled then stalled or did it sound like it locked HARD......just curious as it may help with the diagnosis.... And where do you ride at? Im in Fraser and ride in Mio. Jereme I live in Westland and I also ride in Mio... Going there on Friday staying at Mack Lake and riding the Bull Gap loop, maybe the Luzurne loop...Maybe to McKinnley... Quote Link to comment Share on other sites More sharing options...
Fastassbanshee96 Posted August 6, 2013 Author Report Share Posted August 6, 2013 Jereme- just sounded like it stumbled. Didn't lock hard at all. I think I figured it out. After taking the clutch cover off and not really finding anything I decided it would be best to split the cases to check the crank. So I went to pull the fly wheel and there was no need to do so. The flywheel key blew up and the flywheel backed off. I'm guessing it was the remainder of the key that was locking everything up. But put a new key in and it's back up and running. This is my drag bike that I'm just finishing but when I ride my trail bike I ride mio gladwin, Atlanta, st Helen... All over the place up there. Quote Link to comment Share on other sites More sharing options...
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