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Post by 90GTVert on Oct 22, 2010 8:20:42 GMT -5
Glad you got it running. You might wanna try to adjust the idle mixture and see if that does anything for your cold start problems. It could be time for a vavle adjustment.
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zbuck
Scoot Member
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Post by zbuck on Oct 26, 2010 7:12:38 GMT -5
Brent, I've had this idle mixture all over the place. Went back to the orginal setting. I ran the valves before working on the no start problem. I think this scooter is just cold natured. I am going to check the enrichner, I might have have messed the wiring up when checking wires for the no start problem. Don B.
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Post by 90GTVert on Oct 26, 2010 8:14:22 GMT -5
If the idle mixture doesn't change the idle no matter where it is, you might need a different pilot jet or you could have a vacuum leak somewhere. Could be the enrichener as well. When youre checking the wires, you might wanna make sure it extends out with power applied.
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zbuck
Scoot Member
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Post by zbuck on Oct 27, 2010 10:33:52 GMT -5
Brent, Checked the enricher wiring, broken wire spade  in the connector, repaired. Cold starts much better. I think your are right about a vacuum leak, either in the carb insulator or intake manifold. On the pilot jet, I think it is a 35. But the weather around here has been in the 70's and can not get my grandson off of it long enough to do any checks. Suppose to drop in the 50's for the high the rest off the week, so maybe I can do some more checking and let you know. Don B. |
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Post by 90GTVert on Oct 27, 2010 11:16:39 GMT -5
35 pilot is probably OK if the filter is stock. Don't bother with tuning till you are sure there are no leaks. I guess if he's riding it that much, it can't be too bad. ;D
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zbuck
Scoot Member
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Post by zbuck on Oct 28, 2010 8:07:07 GMT -5
On this scooter it has a 72cc BBK, Uni Filter, modded exhaust, stock carb., head and cam. I modified the carb. insulator and intake manifold to accept gaskets instead of the o-rings. I think that is where my vacuum leak maybe. As the idle goes up and down and I can not take it out by adjusting the air idle screw. For a 26yr old Grandson, he is having a ball riding this scooter. All his buddies are complaining they can not run with him and he has 50lbs on most of them. Now that I have most of the work in my shop caught up, he is going to bring it over this weekend and I am going to check it out. Don B.
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Post by 90GTVert on Oct 28, 2010 9:04:56 GMT -5
Nice. It might be worth picking up a 38 pilot jet, if you can get one before then. That's pretty much the standard jet most people end up using with a UNI. As long as you can get the idle mixture adjusted right though, without being screwed all the way in or out, you shouldn't need to change the pilot.
I'm not a big fan of the orings either. I use a sealant on the head/insulator/intake. It works, just makes a little more to clean up. Most people won't change intakes enough that a few minutes of cleanup should be a big deal though.
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Post by scooterrebel on Oct 28, 2010 13:03:01 GMT -5
ZBuck , I know you have been working on this for a long time, glad yo got it figured out. A man with a ohm meter is unstoppable.
When it comes back to you, check the variator weights, some 4.5 or 5 gm weights might make it amazing.
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zbuck
Scoot Member
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Post by zbuck on Oct 29, 2010 8:25:47 GMT -5
Brent, I have another carb., I am going to pull the idle jet and check size. If it is not bigger than the 35, I have a jewelers drill set and pin gauges and I will open it up one size at a time to see what happens. I usually use Napa hi-tack red for a sealer when I think there might be an oil or vacuum leak, but did not in this case. Must have been brain fade. Scooterrebel, Yes just over two weeks off and on and you are correct about the ohm meter. This scooter has a stock drive train execpt for 5 gram sliders and you are right they really picked the rpm's up. Before with 8 grams it would only turn 6900, with the 5 grams it turns 8100 on my Tiny Tach. Do not know about the mph, as the chino-meter is broke. Don B.
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Post by 90GTVert on Oct 29, 2010 9:08:14 GMT -5
Sounds like you've got it covered then. ;D Let us know how it works out.
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zbuck
Scoot Member
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Post by zbuck on Nov 3, 2010 6:11:55 GMT -5
Update, did not get to work on the scooter this past weekend. Grandson said weather to nice. My other Grandson called last night and said that he bought the scooter from his cousin. But is having a problem, after riding it for three hours (running fine). Stopped by his Moms house, went to leave and it would idle fine but would bog down between 1/4 and 1/2 throttle, would not take gas. Sounds like for some reason it started running to rich or the timing is not advancing? I said to try feathering the throttle and see what happens, he stated it still would not take gas. I am going to look at it today. Any ideas/suggestions will be greatly appreciated. This scooter is going to be the death of me yet. Don B.
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Post by 90GTVert on Nov 3, 2010 7:16:27 GMT -5
I would check for a clogged main jet first, unless it will accept throttle above the 1/4 to 1/2 dead zone he mentioned. If you find a clogged jet, clean the whole carb thoroughly, inspect/replace lines, and replace the fuel filter. If equpped, check the in tank filter as well.
If that doesn't do it, check the accelerator pump, make sure you don't have that vacuum leak, check ignition connections again. I'd think timing would be the least likely, but if you have a timing light it can be checked. Just rev it up and see if it advances.
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zbuck
Scoot Member
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Post by zbuck on Nov 6, 2010 9:42:01 GMT -5
Well as usual my Grandson ( the one that bought it) did not show up with the scooter. He gets side tracked easy, especially when he owes me money. So did not get to check out the scooter. Will update when I get my hands on it. Don B.
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zbuck
Scoot Member
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Post by zbuck on Nov 20, 2010 9:12:48 GMT -5
Update: Grandson finally showed up with the scooter. After charging battery, it fired right up. Let it get good and warm, without touching nothing poped the throttle and it went right to 8200 r's. No miss or bog. It is too cold here for me to go out and run it. Maybe after running it good and hard that is where the problem starts? But I am still going to do the advice that Brent gave me (valves, jet and etc). I will update. Don B.
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Post by 90GTVert on Nov 20, 2010 10:38:02 GMT -5
Unfortunately seeing it rev on the main stand doesnt mean a whole lot. I've seen lots of folks with lean jetting say it runs great on the stand, but bogs on the ground. Gotta see how it acts under load. One thing I do at times when I don't wanna get it out to ride is to hold the rear brake a little and put some load on it. Just be advised that if you hold it too much and stop the wheel the belt will prob slip and you'll find lots of rubber dust in the CVT. That's what happens to me anyway, whenever I think I'm doing a burnout and then realize the tire isn't moving. lol
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in the connector, repaired. Cold starts much better. I think your are right about a vacuum leak, either in the carb insulator or intake manifold. On the pilot jet, I think it is a 35. But the weather around here has been in the 70's and can not get my grandson off of it long enough to do any checks. Suppose to drop in the 50's for the high the rest off the week, so maybe I can do some more checking and let you know. Don B.
