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Post by ooopseyesharted on May 20, 2006 12:27:52 GMT -5
I installed my 80cc kit today. I have everything done and the engine turns over and tries to start. I have adjusted the carb idle air screw and removed the restriction in the air box. But, the only way to keep it running (kinda) is to twist that throttle as fast as you can. I need ideas here....thanks I am not very educated on the carb. I pulled the cover off of my jet and I just dont know what to do from here.
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Post by medman1952 on May 20, 2006 13:22:36 GMT -5
Sounds to me like you might have a serious vacume leak. Recheck the intake manifold for leaks, make sure that everythng is seated well and if you didn't use a gasket you might want to put a bead of silicone between the manifold and the intake port. Also make sure the carb is seated well and any clamp is not over tightened or lose. Especially no cracks if you have a plastic intake manifold.
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Post by ooopseyesharted on May 20, 2006 13:37:26 GMT -5
i will check that. any other ideas?
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Post by medman1952 on May 20, 2006 13:47:48 GMT -5
Major things that can cause a problem are, timing, spark, fuel, compression.
You have Spark
The carb is probably not the problem, so vacum leak would be the fuel proble if one exists
If you had the timing marks line up properly when you assembled the motor and no slips with the timing chain occurred, timing should be OK.
New cylinder, new rings, new piston, shouldn't have a compression problem.
You said it kinda runs if you twist the throttle a lot, really makes me think you have a vacume leak but I have been wrong before. Besides a vacume leak is easiest to fix so lets hope that is it.
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Post by Admin on May 20, 2006 13:52:57 GMT -5
I would check for leak at the intake manifold (the rubber piece that attaches the carb to the engine). Also, I hope you got all gaskets installed properly and your bolts are properly torqued. There are a lot of little things that could be wrong that could cause this. You may end up having to pull the head and double check the timing marks are lined up properly.
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Post by ooopseyesharted on May 20, 2006 14:13:29 GMT -5
I am liking this less and less the more i read.....lol I checked the carb adjustment and returned it to the stock setting. 2.5 turns out. in the idle air screw. It just sputters a little and stalls at 2.5 turns. I also tried a trick we use to use on old chevys. I broke out the carb cleaner and sprayed a little while it was sputtering. It made no difference. I removed the carb, checked the plastic spacer and gasket. those looked fine. I had my boss do the timing and I asked him few times if it was right and he insists that it is right. I had our small engine mechanic do the valve adjustments. He double checked them before I put it back together. I am very very stumped here. I was really looking forward riding thisover the weekend. Man this sucks
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Post by ooopseyesharted on May 20, 2006 14:16:38 GMT -5
do u have pics of how timing should be lined up? I am going to tear it all the way down again and start over. I have no idea how they are suppose to look.
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Post by Admin on May 20, 2006 15:05:30 GMT -5
Hey, I responded to your pm. I suggest that before you tear the thing down again, you put that air restrictor back in and see what happens. The air restrictor should only be removed if accompanied with installing larger jets.
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Post by ooopseyesharted on May 20, 2006 15:18:56 GMT -5
I will give that a try. thanks man
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Post by Jacine on May 20, 2006 16:42:18 GMT -5
I suspect you will need to rejet. You've now got more air in and out, less restriction, you'll probably have to increase the slow and main jet sizes.
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Post by ooopseyesharted on May 20, 2006 17:25:05 GMT -5
I have no idea where to get them. Any ideas on sizes?
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Post by Admin on May 20, 2006 17:39:20 GMT -5
Check the 50/80cc mods thread.
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Post by ooopseyesharted on May 20, 2006 18:12:47 GMT -5
So....search google then....lol that what the 50/80 mods thread says. I ordered an 88 jet and filter from scooter assassins a few minutes ago. I am having trouble find the other jet....its a 38 jet. I havent even found a listing.
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Post by ooopseyesharted on May 24, 2006 6:27:17 GMT -5
Well, my scooter still does not run. I found a 92 jet at the shop and figured what the hell. I installed it and the scooter seems to try to run alot better, but I havent been able to find the low end jet. Rage performance is out of stock. I was wondering if any of you had a that hole just below your valve cover? I got mine running enough to notice that I have exhaust coming out of a port below my valve cover. Anyone else have this?
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Post by ooopseyesharted on May 24, 2006 6:29:22 GMT -5
On a happier note, I got a free 2000 yamaha razz. It has 410 miles on it and runs great. It just needs a front rim and forks. The previous owner hit a curb very hard and bend it a little bit. I also need fairing pieces.
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Post by Admin on May 24, 2006 7:34:22 GMT -5
Well, my scooter still does not run. I found a 92 jet at the shop and figured what the hell. I installed it and the scooter seems to try to run alot better, but I havent been able to find the low end jet. Rage performance is out of stock. I was wondering if any of you had a that hole just below your valve cover? I got mine running enough to notice that I have exhaust coming out of a port below my valve cover. Anyone else have this? The exaust out of the head cover is normal.
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Post by ooopseyesharted on May 24, 2006 15:32:15 GMT -5
Oh......i was told to block it off and it would run better. this sucks
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Post by ooopseyesharted on May 24, 2006 15:32:41 GMT -5
I am going to block it off and put my air restrictor back in.
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Post by Admin on May 24, 2006 15:35:01 GMT -5
Don't block it off. It's an escape for exhaust gasses that gather in the crankcase.
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Post by ooopseyesharted on May 24, 2006 15:38:33 GMT -5
why does a 500cc scoot have that blocked off? i removed the block off of another bike for mine. It is normal for tons of air to be flowing out?
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Post by Admin on May 24, 2006 15:46:15 GMT -5
It's not a big deal either way....won't change performance. I used to have mine blocked off until some smart guys convinced me what it was for right here on this forum a couple months ago. It is designed to have a tube running back into the air intake to help burn off pollutants. It's also a way for gas pressure to release from the crank case. Chances are, you wouldn't build up enough pressure to do any damage anyway. I ran my 80cc blocked off for a long time.
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Post by ooopseyesharted on May 24, 2006 20:36:11 GMT -5
well, i put my restrictor back in the airbox and blocked off my breather. It runs better, but still stumbles badly and does idle at all. This is with stock jets and only some adjusting of my fuel screw. I am thinking about putting my extra 50cc engine in this scooter so that I have something to ride. Being without a scooter is like suddenly loosing your electricity.....you dont miss it till its gone (all the hurricanes here in florida have taught me about loosing power). I ordered an 88 jet from scooter assassins, but I havent gotten a reply to my 2 emails about tracking numbers or when I could even expect shipment. These guys worry me alot.
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Post by riker140 on May 25, 2006 16:50:41 GMT -5
Well welcome to the club. I would not buy from them if I were you. But like me you have and I got crap Check the 50cc/80cc mods link I stared it and you will find a lot of info on upgrades and neat thing and were to get jet's Try scootertronics.com Mike's has jets for 50cc/80cc.
Dave
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Post by ooopseyesharted on May 26, 2006 14:06:10 GMT -5
thanks alot man. I am going to double check my timing tomorrow and see it if is ok. If that doesnt do it then I will order a jet from scootertronics.com
Thanks again.
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Post by artfuldodger00 on Jun 18, 2006 0:48:30 GMT -5
hey guyswhats up? just thought id jump in here to say i too am in the middle of an installand having the exact same problems. however,i set the valve timing wrong by mistake and the damn thing ran better. i also put a carb off a 150 on it and it ran better yet. now im stuck with this popping under a load out the intake port .ive changed the valve lash all over the board and cant shake it. bent valve?this sucks the customer wants to go riding tommorrow and im afraid even if i get it close. i dont want to turn it loose like this. does anyone have after install specs that work??? don
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Post by Admin on Jun 18, 2006 4:09:49 GMT -5
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Post by ooopseyesharted on Jun 18, 2006 8:47:32 GMT -5
i installed mine exactly as the my instruction told me to. I would recommend inspecting those valves first. Maybe the timing is a little off as well.
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Post by Admin on Jun 18, 2006 9:09:16 GMT -5
Hey ooopsy, I missed something somewhere. Did you ever get yours running correctly?
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Post by ooopseyesharted on Jun 18, 2006 10:52:06 GMT -5
I did, but it is lean at the topend and noone has an 88 or 90 jet for me to buy. I have tried ordering from 3 different places so far.
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Post by Admin on Jun 18, 2006 14:10:41 GMT -5
With you being at low altitude, you especially get it jetted. I've been rebuked by some for this but it has worked for me and others. Allen Grota (a true guru) did the original experimenting with this. Consider drilling the jet out with a #60 drill. Or, if you want a better mix until you can find an 88 or 90 jet, put the air restrictor back in.
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