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Thread: 3.3 idle issue

  1. #1
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    3.3 idle issue

    I have a new trx 3.3 in my nitro slayer pro, only has about 2 qts through it including break in. Break in was done properly and has been tuned correctly. I can't seem to get it to hold an idle without the rpms increasing and the truck will move forward if I'm not on the breaks constantly. If I try to decrease the idle via the idle screw it dies, it's all or nothing. Any clues as to what the problem is? I'm hoping to make it to my first race Sunday. I'm semi new to nitro. Thanks in advance.

  2. #2
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    I've also tried fattening the LSN in attempt to tame the idle, it's about as rich as I can go while still maintaining crisp throttle response and bottom end power.

  3. #3
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    See if it will idle with the wheels off the ground. If it will, it's the spring around the clutch has broken.

  4. #4
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    Can you pop off the air filter and snap a picture of what it looks like down the throat?

  5. #5
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    Quote Originally Posted by Mark Ball View Post
    See if it will idle with the wheels off the ground. If it will, it's the spring around the clutch has broken.
    It's for sure not a clutch issue. Went through clutch issues with my 4-tec before I sold it so I know those symptoms.

  6. #6
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    Quote Originally Posted by Kyleb View Post
    Can you pop off the air filter and snap a picture of what it looks like down the throat?



    It may be open a bit much, but any less and it'll die. The way I know it's not the clutch, I can hold the brakes and it won't die it just idles really high.

  7. #7
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    If it has a high idle with a good idle gap the lsn is to lean.

  8. #8
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    Quote Originally Posted by Mark Ball View Post
    If it has a high idle with a good idle gap the lsn is to lean.
    If I fatten the lsn anymore I run into a bogging issue

  9. #9
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    Then it sounds like an air leak. Spray mild soapy water around the outside of the carb and engine. You should be able to see it if there is one.

  10. #10
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    Quote Originally Posted by Mark Ball View Post
    Then it sounds like an air leak. Spray mild soapy water around the outside of the carb and engine. You should be able to see it if there is one.
    While running?

  11. #11
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    Yea, just make sure your air filter is on.

  12. #12
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    Wound up not testing for leaks, I had suspected a leak also due to excessive dust collecting around the back plate so I just went ahead and pulled the motor so I can seal it at work tomorrow. I'll report back when it's back together. Thanks.

  13. #13
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    Sealed it up today, got it back in the truck retuned it and it runs great! Thanks mark ball!

  14. #14
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    Cool man, it always makes you feel good when your motor runs good.

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