PDA

View Full Version : ATC 70 sputter/bog at WOT


inv3ctiv3
10-01-2009, 01:19 PM
So my ATC 70 runs and it runs ok but I noticed it sputters at WOT. Like it just doesn't feel like it has a lot of power, I've tried messing with the carb adjustments and that doesn't really do much. Anything else I could try? The air filter is clean I know that.
Jeepermc
10-01-2009, 01:43 PM
Fuel filter?
inv3ctiv3
10-01-2009, 01:53 PM
Fuel filter?

Brand new fuel filter
85Tecate
10-01-2009, 02:43 PM
Is it modded any? Make sure the main jet isnt clogged. Does it happen when you crack the throttle from an idle? If so, try changing the clip position of the needle. Go either direction and see if it helps. I had a ytm 200 do this and the needle clip position fixed it.
Daddio
10-01-2009, 02:57 PM
So my ATC 70 runs and it runs ok but I noticed it sputters at WOT. Like it just doesn't feel like it has a lot of power, I've tried messing with the carb adjustments and that doesn't really do much. Anything else I could try? The air filter is clean I know that.

Is it a stock carb? A very small piece of dirt will wreak havoc on one of those.
MudBug
10-01-2009, 03:24 PM
governor isnt on is it?
inv3ctiv3
10-01-2009, 04:11 PM
governor isnt on is it?

The governer!? haha I hope not!

I completely took the carb apart and cleaned everything, all the jets and everything....I can try to do it again.
CRAZY70MAN
10-01-2009, 09:52 PM
clean carb again and again and 3 more times....... sounds like crud in carb or air filter problem??? Getting to much air somehow??? Some of my 70's are very air sensitive... lol lol soak that carb for a day in evaporust and you will be suprised..... good luck......... hate to see a atc 70 down!!! Breaks CRAZY'S heart........:( :(
UlsterATCFan
10-02-2009, 02:32 AM
clean carb again and again and 3 more times....... sounds like crud in carb or air filter problem??? Getting to much air somehow??? Some of my 70's are very air sensitive... lol lol soak that carb for a day in evaporust and you will be suprised..... good luck......... hate to see a atc 70 down!!! Breaks CRAZY'S heart........:( :(

LOL you definitely are a CRAZY 70 man :beer
MudBug
10-02-2009, 02:17 PM
haha so I take it there is no governor on the 70 :P
blue27
10-02-2009, 03:30 PM
haha so I take it there is no governor on the 70 :P

Well... there is a throttle limint screw on the back of the thumb throttle on some 70's, I have never seen one that still had it in there,lol but there is a chance, you are suppossed to remove the limit screw and plug the hole with the special short screw to keep out dirt, haven't seen to many with that either, just an open hole. Sounds like you have dirt in the carb or the points need adjusted.
inv3ctiv3
10-02-2009, 04:14 PM
They are brand new points, but if they are out of adjustment it would make it sputter?
Vealmonkey
10-02-2009, 05:48 PM
I was thinking points myself. Do you have new points and condenser too? Points out of adjustment or old points can cause a sputter.
inv3ctiv3
10-02-2009, 08:19 PM
The points are brand new and I thought they were in spec by maybe not, I'll check them again.