09-04-2014, 10:08 AM | #1 |
Join Date: Aug 2014
Location: Milford, Ontario, Canada
Posts: 18
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engine idles high only when warm
I just bought what I believe to be a jetmoto 250cc. It starts and idles perfect then I take it out for a ride. Upon returning from ride and trying to let idle it seems to idle very high. I would know what to do if it were a car but and am brand new to atv's. I can't even seem to find a service manual to know what to even look for.
Any help greatly appreciated. andrew
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09-04-2014, 05:08 PM | #2 |
Join Date: Sep 2014
Posts: 4
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You should be adjusting you carb will its warm so you can control the rpms while it in operating mode. So try and turn down the idle screw while it is warm, and see if it till fires up ok when it is cold also.
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09-04-2014, 11:51 PM | #3 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Welcome, Gordon! Where in Ontario are you?
When you rev up the motor and release the throttle, does it settle down right away, or take a few seconds?
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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09-05-2014, 07:48 AM | #4 |
Join Date: Aug 2014
Location: Milford, Ontario, Canada
Posts: 18
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If you are referring to the little silver screw on the side of the carb I will try that I did not know what was the idle screw as I don't have a manual of any kind for this bike.
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09-05-2014, 07:49 AM | #5 |
Join Date: Aug 2014
Location: Milford, Ontario, Canada
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I am in a little town called Milford. It is south of Picton. Yes it does settle right back down immediately but just not as low as it should be.
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09-05-2014, 08:14 AM | #6 |
Join Date: Mar 2008
Posts: 2,436
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Keihin clone: http://www.walbro.com/media/22805/pz-tune.pdf
--- http://www.motorfans.com.cn/bbs/view...authorid=75082
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09-05-2014, 08:35 AM | #7 | |
Join Date: Aug 2014
Location: Milford, Ontario, Canada
Posts: 18
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Quote:
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09-05-2014, 09:04 AM | #8 |
Join Date: Aug 2014
Location: Milford, Ontario, Canada
Posts: 18
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Ok I have done as sunl1979 said and adjusted the idle now it does not idle really high when warm but seems to want to stall when cold I guess it is just a matter of finding a happy medium now.
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09-05-2014, 09:21 AM | #9 |
Join Date: Mar 2008
Posts: 2,436
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http://www.microsofttranslator.com/b...%3D15274249845
Digital tacho is very useful tool tuning "chinese" & old bike : CG clone is 1400 +/- 100 rpm
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09-05-2014, 11:18 AM | #10 |
Join Date: May 2013
Location: finger lakes NY
Posts: 2,061
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thats common... my cg200 based dirtbike is the same way... however if the choke is partly on, it will idle ok for me... just takes about 5 min to warm up...
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09-05-2014, 11:23 AM | #11 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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The idle was set high to crutch the small slow jet.
I've found that the slow jets are too small, especially when the weather gets a little colder. Slow jets are difficult to find for that carb, but Mikuni jets are found at your local Yamaha dealer, in addition to eBay. A 30mm Mikuni is cheap and worthwhile, so you can begin tuning. $42.28 Canadian to your door: http://www.ebay.ca/itm/VM26-30MM-MIK...1d2238&vxp=mtr
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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09-05-2014, 11:30 AM | #12 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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I bet it's nice to be that close to the lake. I've never been to Milford, but I've travelled through Cobourg and Kingston, so not too far off.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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09-06-2014, 01:37 PM | #13 |
Join Date: Aug 2014
Location: Milford, Ontario, Canada
Posts: 18
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I love being close to the lake and the fishing is plentiful as well. I bet living out by the Rocky Mountains is awesome as well. I made another minor adjustment to the idle screw seems to work much better but will look into that jet as well. Just did an oil change on it as well and used Rotella T 15W 40 does that ok for it.
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09-06-2014, 02:32 PM | #14 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
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15W40 is all I ever use. I'm happy with Rotella, Delo or Delvac; whatever is on sale.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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09-09-2014, 03:05 PM | #15 |
Join Date: Aug 2014
Location: Milford, Ontario, Canada
Posts: 18
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This would seem to be fixed now and have that Mikuni Carb on order as well just because i want a better setup and adjustability.
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