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Post by larry001964 on Dec 21, 2010 21:09:09 GMT -5
Hi Guy's
I've Got the mother of the Gremlins, and need help.
When I'm running at WOT my scoot seem to run fine for a bit, then has little fits where she leans out and tries to die.. If i hold WOT she will die, if i quickly pump the throttle back and forth i can keep it running.. Working the Accel pump on the carb is what i think I'm doing. If i back off the WOT to 1/2 throttle she seems to stay running but if i come back into it she does it again. This will last a bit then she will run fine for a while then start it again.
Cold weather starts she starts up and idels just fine, no problems warms up and then i go. The temp here varies from 10 to 30 degrees.
This is what I have done
Replaced the fuel filter
Removed and cleaned the tank.
Replaced the petcock
Removed the petcock completely and ran straight to the carb.
Checked the adjustment on my valves three times. intake .003 and exhaust is .004
I have up jetted # 92 main jet, Now does not need tape on the airbox snorkel tube,
Tried three brand new carbs
New High Energy Coil.
NGK Iridium Plug.
Fram Fuel Filter
Removed the pollution crap and ran the hose from the top of the head to air box snorkel intake.
I thought I had fixed it until coming back from the station today. I had allowed it to warm up 10 mins before going. Got to the station, bought my cigs, came out ( 2 mins ) started it back up and about 1/2 way home. Maybe half a mile tops it had one of its fits and wanted to quit.
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Post by keetarider on Dec 21, 2010 21:43:26 GMT -5
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Post by Bong on Dec 21, 2010 21:51:44 GMT -5
Do not get it wet and no matter how much it begs do not feed it after midnight!!!!! ;D ;D ;D Jk It does sound like a vacuum leak. Check all the rubber lines for cracks or wear from rubbing. Did you put the petcock back on or is the line going strait to the carb still? Might be getting to much gas and running rich at WOT. |
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Post by larry001964 on Dec 21, 2010 22:02:39 GMT -5
Do not get it wet and no matter how much it begs do not feed it after midnight!!!!! ;D ;D ;D Jk It does sound like a vacuum leak. Check all the rubber lines for cracks or wear from rubbing. Did you put the petcock back on or is the line going strait to the carb still? Might be getting to much gas and running rich at WOT. God help me I didn't feed it after midnight, but i think the snow melted on it..  It's almost like it's throwing a fit, it will run fine for a while then suddenly and with out warning it does this, if you nurse it a bit for a while it comes out of it and runs normally... I did a plug chop at the time it threw it's fit and it shows lean on the plug. But if i do a plug chop any other time the plug shows good color... That's the confusing part. And it only does this from 3/4 to WOT but not all the time some times it may not throw a fit for 10 miles other times 1/2 mile. |
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Post by relaxinrob on Dec 21, 2010 22:24:09 GMT -5
Raise the needle in the carb
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Post by dasurfguy101 on Dec 21, 2010 22:25:33 GMT -5
cdi?i had a non rev racing cdi and had similar problems.took me a while to figure it out.end result stock cdi"no rev".no more problems.baffled alot of us for while..im just saying.
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Post by larry001964 on Dec 21, 2010 22:27:03 GMT -5
Raise the needle in the carb You mean the float bowl, Needle, so i fill my bowl with more with fuel or the diaphragm needle ? |
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Post by larry001964 on Dec 21, 2010 22:30:15 GMT -5
cdi?i had a non rev racing cdi and had similar problems.took me a while to figure it out.end result stock cdi"no rev".no more problems.baffled alot of us for while..im just saying. Maybe, I bought a new CDI none rev limiting. I have tried them both the stock and the new.. Is it possible the new CDI not really a non Rev limiting... How can I tell ? both look nearly identical ? |
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Post by tvnacman on Dec 22, 2010 2:48:53 GMT -5
perhaps the enrichner
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Post by Bluefront on Dec 22, 2010 5:33:53 GMT -5
Since you've tried three carbs and had the same issues, I'd think you've eliminated any carb problems. Have you tried running without a fuel filter? I've read here that using a car filter can cause lean symptoms.....since car filters are meant to be used with a fuel pump.
Worth a try anyway....
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Post by dasurfguy101 on Dec 22, 2010 15:36:21 GMT -5
another idea.when i went to bigger fuel line,and a real filter.mine seemed to act up.very similar well the outcome i found that the fuel line went down then looped up and back down to the carb.almost like the vaccum wasnt quite enough with the bigger line..so i chnaged it and routed it down toward the carb.it stopped acting up.it mite have been another issue along with the cdi,but that what it took to straighten mine out.
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Post by Bong on Dec 22, 2010 15:57:05 GMT -5
Take another look at keetriders suggestion and link. Even if you tried 3 carbs if the needle position, A/F mix is the same you will get the same results IMO. At WOT a lean condition may be occurring. BTW don't leave it in the sunlight either!!! ;D ;D ;DJK
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Post by larry001964 on Dec 22, 2010 20:17:56 GMT -5
Take another look at keetriders suggestion and link. Even if you tried 3 carbs if the needle position, A/F mix is the same you will get the same results IMO. At WOT a lean condition may be occurring. BTW don't leave it in the sunlight either!!! ;D ;D ;DJK I think I may have got that little Gremlin, Today I decided to replace all the vacuum lines and fuel lines with high quality lines. I Bought the clear blue stuff that's suppose to be a very high quality.. Any way and here's the really stupid part. While putting the new line on I noticed the fuel petcock was higher than line out from the tank.... Duuuuuuu how did I ever miss that one on a gravity feed system. Any way time will tell but it seems much happier now, running seeming good, I drove it 20 miles to confirm this and so far it ran perfectly... God if its truly that simple.. Could have been the fuel lines, could have been the vacuum lines, could have been the height of the fuel petcock above the tank fuel outlet.. But the way the petcock was mounted after my tank got below 3/4 of a tank gravity was no longer a help. Thanks every one for your suggestions I checked them all today. |
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Post by Bong on Dec 22, 2010 21:41:13 GMT -5
Told you not to feed it at Midnight, Around 6:00 is best if your looking at the clock. ;D ;D ;D Sorry, couldn't help myself. Glad things worked out for ya |
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Post by larry001964 on Dec 23, 2010 9:42:11 GMT -5
I know I know I didn't feed it, the snow melted,, I didn't know LOL
I'm not 100 % sure I got it, Today will be the test that should tell me.
I thought sunlight killed gremlins ?
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Post by tortoise on Dec 24, 2010 16:19:41 GMT -5
may have got that little Gremlin . . . noticed the fuel petcock was higher than line out from the tank . . . after my tank got below 3/4 of a tank gravity was no longer a help. Very interesting! Since the carb fuel bowl is vented to atmosphere, there is no carb suction on the inlet fuel port (float valve). In theory, however, there should be a siphon effect until broken for some reason. Definitely a potential intermittent gremlin. Curious to know if the location of the vacuum petcock on the frame is a factory issue, or was owner modified? |
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Post by larry001964 on Dec 24, 2010 17:24:09 GMT -5
may have got that little Gremlin . . . noticed the fuel petcock was higher than line out from the tank . . . after my tank got below 3/4 of a tank gravity was no longer a help. Very interesting! Since the carb fuel bowl is vented to atmosphere, there is no carb suction on the inlet fuel port (float valve). In theory, however, there should be a siphon effect until broken for some reason. Definitely a potential intermittent gremlin. Curious to know if the location of the vacuum petcock on the frame is a factory issue, or was owner modified? Hi Tortoise The petcock location was mounted on the Left hand side of seat bucket on the frame. Just a little lower than the tank filler cap. You would think the siphon effect would have kept the fuel flowing, and I em not sure it didn't, but when I started the motor, I did notice a lot of air bubbles coming from the carb traveling up the tube thur the filter and into the tank.. Perhaps it's the new fuel filter, or the new line' I honestly can't be sure either as I did all three at the same time. The fuel petcock was mounted at the factory in that position, I bought this scooter brand new and it's had this gremlin since day 1. I also had other problems going on at the same time making it harder to diagnose.. It arrived just as the temps here were plunging to winter, I had to tape up a few holes on the airbox snorkel tube. once the temps stabilized to normal winter temps it was easier to dial in the correct main jet size, and not need the tape on the snorkel tube. All I can say for sure is that it was one of the three, I have put 40 miles on it since I did all of that to it.. And it hasn't had one single fit so far. It hasn't even given any sign of doing it again.. |
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