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Post by bikerdude on Aug 29, 2009 12:17:19 GMT -5
OK, did that moved the e ring to raise the needle.. No diff. Then thought well I got the carb removed, try re jetting it with the drilled out jet from the first carb, worse than before plug now black and back to 3000 rpm air cleaner on or off makes no diff fingers in intake makes no diff now... Did I go too large with the jet? Thanks for all your input guys! Frank, loosing hope
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Post by harrywr2 on Aug 29, 2009 13:31:18 GMT -5
OK, did that moved the e ring to raise the needle.. No diff. Then thought well I got the carb removed, try re jetting it with the drilled out jet from the first carb, worse than before plug now black and back to 3000 rpm air cleaner on or off makes no diff fingers in intake makes no diff now... Did I go too large with the jet? Thanks for all your input guys! Frank, loosing hope Stock main jets usually run around .105 or .107.. With stock airbox and exhaust .115 is about as big as you would want to go at sea level. Performance filter and performance exhaust maybe as high as .128 at sea level.
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Post by bikerdude on Aug 29, 2009 23:45:07 GMT -5
Thanks, I will get a few jets and try them. I think my original says 1.05 and the new carb had a 1.04 is that in inches? Will get a 110, 112, 115 and try from there! Any body have any jets that I could just try near York,PA Stores will all be closed tomorrow I wanna ride!!!! Just keep dumping money and nothing seems to help. Frank
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Post by bikerdude on Sept 1, 2009 21:58:09 GMT -5
Was able to find a 100 size jet today, still same 4000rpm wot When I put a larger jet in then I cant use the stock air box.. should I remove the stock air box? What should I excpect this thing to rev up to? I never had it run properly yet.. Put the needle valve e clip back in the middle slot, much smoother up to wot then it bogs bad,.... No other suggestions? Frank
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Post by bikerdude on Sept 9, 2009 0:17:47 GMT -5
My jets should be it soon. Will start Carb tune fresh. Can I just go to a local store for vacuum and fuel lines. Like an auto zone or advanced auto? Any suggestions on best prices for uni air filters and maybe a CDI and a coil. I see so many places that sell them. Who to buy from? Best prices? I was able to get the jets for around 3$ each from the local cycle dealer.
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Post by harrywr2 on Sept 9, 2009 8:25:51 GMT -5
My jets should be it soon. Will start Carb tune fresh. Can I just go to a local store for vacuum and fuel lines. Like an auto zone or advanced auto? 3/16" Goodyear/Gates SAE J30/R7 standard automotive fuel lines work great for vacuum and fuel line on a scooter. Most autoparts stores sell it by the foot.
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Post by phaze on Sept 10, 2009 17:12:05 GMT -5
is your diaprham on top of the carb seated properly, i know, but make sure that is what was wrong with mine, i used grease to hold that little bastard,
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Post by bikerdude on Sept 12, 2009 0:09:21 GMT -5
Thx for the reply, yes its seated nice. I have had it off many times to check, also with a new carb it does the same. I put a 105 jet in the original carb and vented the air box a bit. Have a nice almond colored spark plug now. Max rpm is now 5000 wot. Tried to hook up a dwell/ Tach meter to verify LCD tach on the scoot, seems I forget how to hook that up??? I have a green and a black gator clip from the meter. I think I hooked that up to the low voltage side of car dist caps. May not be able to use that device with CDI?
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Post by crazyntacoma on Sept 14, 2009 19:17:05 GMT -5
Nothing to add cept this is a great thread lol
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Post by gmoney on Sept 17, 2009 16:20:25 GMT -5
Any chance it's fuel starved once you get up to 4-5000 RPM? Based on reading the entire post it sure sounds like it's running out of fuel. Is your tank above the carb or below? If it's above make sure it's not kinked or pinched. I had and old scoot that would do the same exact thing, tried all of the suggested remedies with no success. Finally found out it was a fuel restriction and replaced the fuel line with a slightly larger line and that fixed it. Hope this helps. You might also check the float level, but I doubt that's the problem since you have replaced the carb with a new one.
Gary
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Post by Aerostudent on Sept 18, 2009 1:09:00 GMT -5
If the carb tuning doesn't help, I would spring for a new CDI. I had a scooter doing almost the exact same thing as this, it would rev and start puttering at 3500rpm, and if I kept pushing it, it would drop down, and die. I replaced the CDI, and within about 1 minute, it was running fine.
Might not be the case with yours, but worth looking into I think. Good luck!
Aero
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Post by bikerdude on Sept 25, 2009 8:55:08 GMT -5
Thx guys! Yes I replaced the fuel lines and even ran one from the tank to the carb direct, no diff! I do believe bigdogg Rich had stated to replace the CDI a long time ago on this thread. May go get one today.. also I cant figure out my trip reset where is it?? I have a red button to the left of the starter button and it sets a clock that just keeps adding time forever???
CDI Huh? Really appreciate the input! Frank
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Post by bikerdude on Sept 25, 2009 9:01:34 GMT -5
Sorry, one more thing to add it no longer bogs at WOT it just revs upto about 5k not alot of speed or power. Cant rev any higher than that unless its on the centerstand then I may get 6K rpm Max... Still CDI??? I do seem to have alot of backpressure from the airbox, that is louder than the exhaust. Adjusted valves many timesm anything else that would give me that blowback? Timing light says its on T mark as I rev.. Put your thinking caps on Guys and Gals! Frank
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Post by bikerdude on Oct 2, 2009 22:26:58 GMT -5
replaced the CDI today, still the same. Idles perfect just no revs?
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Post by eagle150 on Oct 3, 2009 2:30:34 GMT -5
Bikerdude,
My scoot is a Xingyue Eagle 150, with 13" wheels. I'm not familiar with your Primo, but it is probably very similar to mine mechanically. I had VERY similar problems with mine, though they didn't begin until 1,000 miles on the clock.
Over a month of diagnosing, and going crazy trying every fix inder the sun, I finally found my carb had gone bad, AND the CDI AND the coil were going bad. I put on a new Mikuni carb, which didn't improve things much. I fooled with the needle and jets and got the best running with a 125 main and 42.5 idle jet (which should be TOO rich, but on mine, it's not). THESE ARE ALL DIFFERENT...
I had bad accelleration and got small improvements by raising the needle until it was as high as it would go. I then turned a couple more grooves even higher, and that REALLY improved things.
Then, I put on a new CDI with no rev-limiter, AND a new Bando orange coil. That improved things more, AND finally I installed a UNI sock air filter and THAT did the final improvement. FINALLY... it runs right, strong right up to 8,200 rpm.
I know it seems awful to have all these malfunctions, especially pretty much at once... But it does happen with these. My particular scoot never would run right with the factory airbox. The UNI filter is a necessity on it. However, the new CDI and coil were major factors in getting it right. They are fairly inexpensive, and quick, easy upgrades.
Hope this info may be of some help in your quest... I see no reason why one of these scooters couldn't act up like mine, even in brand-new condition. Once you get it right, they become GREAT and CHEAP transportation!
Best wishes, and enjoy the ride!
Betty & Leo in Texas
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Post by bikerdude on Oct 3, 2009 23:24:53 GMT -5
Thx for the reply, how can I tell if the cam timing was off from the factory, only thing left??? any links. If the flwheel is set at TDC and the cam is showing 3 holes can it still be off a tooth? Franco
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Post by Chip on Oct 4, 2009 12:14:27 GMT -5
Rich had a post on another thread...check the hose coming off the valve cover..make sure it's not kinked and the fitting and valve cover are not blocked. He said he had one in his shop that was blocked and had to drill out. Might also check all of your vacuum lines
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Post by scootnsd on Oct 4, 2009 16:02:59 GMT -5
I worked on a scoot that did exactly as you describe. We did it all, replaced carb, new cdi, new coil, fuel etc. Turned out to be a speed limiter. Look for an extra box near the cdi. The set screw was hidden with a small cap on ours. Adjusted that a bit and all better. We ended up just removing it all together buy just unplugging it. It now runs great.
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Post by bullet28027 on Oct 31, 2009 21:57:01 GMT -5
Bikerdude, did you get it fixed yet? I have the same exact problem, I've tried new carb, CDI, coil, fuel pump, valve adjustment, fuel filter, fuel lines, vac. lines, and carb adjustments. I'm still waiting for new jets. I am not going to let it beat me, I will keep you posted on my progress or lack of. PS I could not find a speed limiter on mine.
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