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Thread: ATC 70 sputter/bog at WOT

  1. 10-01-2009, 01:19 PM #1
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    ATC 70 sputter/bog at WOT

    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.
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  2. 10-01-2009, 01:43 PM #2
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    Fuel filter?
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  3. 10-01-2009, 01:53 PM #3
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    Quote Originally Posted by Jeepermc View Post
    Fuel filter?
    Brand new fuel filter
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  4. 10-01-2009, 02:43 PM #4
    85Tecate
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    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.
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  5. 10-01-2009, 02:57 PM #5
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    Quote Originally Posted by inv3ctiv3 View Post
    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.
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  6. 10-01-2009, 03:24 PM #6
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    governor isnt on is it?
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  7. 10-01-2009, 04:11 PM #7
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    Quote Originally Posted by MudBug View Post
    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.
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  8. 10-01-2009, 09:52 PM #8
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    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........
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  9. 10-02-2009, 02:32 AM #9
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    Quote Originally Posted by CRAZY70MAN View Post
    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
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  10. 10-02-2009, 02:17 PM #10
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    haha so I take it there is no governor on the 70 :P
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  11. 10-02-2009, 03:30 PM #11
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    Quote Originally Posted by MudBug View Post
    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.

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  12. 10-02-2009, 04:14 PM #12
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    They are brand new points, but if they are out of adjustment it would make it sputter?
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  13. 10-02-2009, 05:48 PM #13
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    I was thinking points myself. Do you have new points and condenser too? Points out of adjustment or old points can cause a sputter.
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  14. 10-02-2009, 08:19 PM #14
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    The points are brand new and I thought they were in spec by maybe not, I'll check them again.
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