Planet Minis

Just Electric · 11-18-2009, 10:24 PM

i have an 1983 atc 70 4 speed all stock my father was the original owner/my first 3 wheeler as a kid.it runs great but we put new points in it and gapped them to honda spec and now when i ride it to the crapper aka toy hauler it sputters and cuts out but when i(richen the thing up) turn the coke on it runs perfect.i dont understand after all these years and riding it at most of the same spots its whole life why i would need to re jet the carb.any advice or another place to start to fix this problem is much appreciated

50-50 · 11-18-2009, 10:48 PM

The temperature change that comes along with the change of the seasons may also force you to rejet for desirable performance.

Just Electric · 11-18-2009, 11:57 PM

thanks i think i will try a new plug since it hasnt been changed in a few years.but i will note this

tblumer · 11-19-2009, 05:16 AM

cooler air = less dense = more fuel needed

T Bolt USA · 11-19-2009, 06:04 AM

we have s simple jetting guide in our tech data section
TBolt USA, LLC Tech Database - Home

dirtbkr188 · 11-19-2009, 07:05 AM

Actually, cooler air is denser, which is why you have to richen the mixture in the cooler temps.

Z · 11-19-2009, 07:13 AM

You don't need to rejet the carb.

Clean and rebuilt the carb. I'd also see about putting a timing light on the flywheel to see where your timing is at. These motors run stronger with the timing slightly advanced.

Clean out the carb...

Just Electric · 11-19-2009, 06:51 PM

got it figured out the long needle that has the eclip and spring return for the thumb throttle was set to lean fattened it up and running like a champ.thanks for all your help

edmonster · 11-21-2009, 08:12 AM

yeah im pretty sure jetting isnt a problem as i ride in 80 degree weather in the summer and 30 below in the winter on my 185s and i never change jets.

11-18-2009, 10:24 PM	#1 (permalink)
Just Electric PM Newbie Join Date: Nov 2009 Location: S.F.V Posts: 17	questin for you atc70 guru's i have an 1983 atc 70 4 speed all stock my father was the original owner/my first 3 wheeler as a kid.it runs great but we put new points in it and gapped them to honda spec and now when i ride it to the crapper aka toy hauler it sputters and cuts out but when i(richen the thing up) turn the coke on it runs perfect.i dont understand after all these years and riding it at most of the same spots its whole life why i would need to re jet the carb.any advice or another place to start to fix this problem is much appreciated

11-18-2009, 10:48 PM	#2 (permalink)
50-50 3rd Gear Member Join Date: Aug 2006 Location: PA Posts: 2,025 My Mood:	Re: questin for you atc70 guru's The temperature change that comes along with the change of the seasons may also force you to rejet for desirable performance.

11-18-2009, 11:57 PM	#3 (permalink)
Just Electric PM Newbie Join Date: Nov 2009 Location: S.F.V Posts: 17	Re: questin for you atc70 guru's thanks i think i will try a new plug since it hasnt been changed in a few years.but i will note this

11-19-2009, 05:16 AM	#4 (permalink)
tblumer 1st Gear Member Join Date: Mar 2009 Posts: 117 My Mood:	Re: questin for you atc70 guru's cooler air = less dense = more fuel needed

11-19-2009, 06:04 AM	#5 (permalink)
T Bolt USA Advertiser Join Date: Jan 2005 Posts: 5,113 My Mood:	Re: questin for you atc70 guru's we have s simple jetting guide in our tech data section TBolt USA, LLC Tech Database - Home __________________ T Bolt USA ALL top Pitbikes ,Engines and Parts for Pitbikes & Minis Website Contact THECRKID@TBOLTUSA.COM or Call 215-630-3554

11-19-2009, 07:05 AM	#6 (permalink)
dirtbkr188 3rd Gear Member Join Date: May 2004 Location: New Jersey Posts: 3,105	Re: questin for you atc70 guru's Actually, cooler air is denser, which is why you have to richen the mixture in the cooler temps.

11-19-2009, 07:13 AM	#7 (permalink)
Z 5th Gear Member Join Date: Sep 2003 Location: KANSAS Posts: 8,692	Re: questin for you atc70 guru's You don't need to rejet the carb. Clean and rebuilt the carb. I'd also see about putting a timing light on the flywheel to see where your timing is at. These motors run stronger with the timing slightly advanced. Clean out the carb...

11-19-2009, 06:51 PM	#8 (permalink)
Just Electric PM Newbie Join Date: Nov 2009 Location: S.F.V Posts: 17	Re: questin for you atc70 guru's got it figured out the long needle that has the eclip and spring return for the thumb throttle was set to lean fattened it up and running like a champ.thanks for all your help

11-21-2009, 08:12 AM	#9 (permalink)
edmonster 2nd Gear Member Join Date: May 2008 Location: Ely, Minnesota Posts: 322	Re: questin for you atc70 guru's yeah im pretty sure jetting isnt a problem as i ride in 80 degree weather in the summer and 30 below in the winter on my 185s and i never change jets.

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