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Constant drive??? Kyosho MP9 tki4

Constant drive??? Kyosho MP9 tki4

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Old 04-21-2019, 02:06 AM
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Default Constant drive??? Kyosho MP9 tki4

hi there new to this so hoping I can get some help

i have a new tki4 and have been breaking it in its had 2 tanks through it then I noticed a horrible rattle coming from around the centre diff!

i then noticed it has constant drive so if I try to start on the floor it drives!

Its is brand new so hope I can fix quick but not looking good 😂

any help would be great great thanks sean

Last edited by 1/8 IC Fan; 04-21-2019 at 07:35 PM. Reason: Miss spell
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Old 04-21-2019, 03:09 AM
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Originally Posted by Seanym View Post
hi there new to this so hoping I can get some help

i have a new tki4 and have been breaking it in its had 2 tanks through it then I noticed a horrible rattle coming from around the centre diff!

i then noticed it has constant drive so if I try to start on the floor it drives!

Its is brand new so hope I can fix quick but not looking good 😂

any help would be great great thanks sean
There is something wrong with the clutch. The clutch should not engage until the engine RPM rises above idle RPM. Pull the engine and check out the clutch.

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Old 04-21-2019, 03:10 AM
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Something is wrong with the clutch. could be things like:
- melted shoe
- broken spring
- failed ball beaering
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Old 04-21-2019, 11:23 AM
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I was having the same issue with my 8ight 3.0 not being able to roll without turning the engine over and it was due to a bearing in the clutch bell exploding.
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Old 04-21-2019, 01:12 PM
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Yeah, it's a clutch bearing or spring failure.
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Old 04-21-2019, 06:24 PM
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being he said its "brand new", I think its probably not a bearing, but incorrect assembly. Either shimmed too tight and the screw is locking up the clutch bell or the springs are not even installed on the shoes.
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Old 04-21-2019, 06:35 PM
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Perhaps, but a defective bearing or spring will fail quickly. He should take the clutch apart. It's the only way to know.
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Old 04-21-2019, 06:36 PM
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or a high idle
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Old 04-24-2019, 11:11 AM
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Originally Posted by iplaygames View Post
or a high idle
This. Everyone assumed that something was broken, except that maybe the servo trimming was off, or the idle was too high.
Rattling could be the mesh being wrong as well.

Last edited by sebtarta; 04-24-2019 at 11:31 AM.
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Old 04-24-2019, 12:19 PM
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The rattling sound makes it obvious it's a clutch issue and not a trim or idle speed issue.
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Old 04-24-2019, 12:50 PM
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Well we won't know until he/she takes it apart and posts pictures showing the outcome.
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Old 05-03-2019, 01:16 PM
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Not to get off the subject how many of you have put your diffs in backwards? I did it a few years back after I rebuilt my Jamming x-1. I started the car and it moved but very little and then it dawned on me I put in backwards and this is not the issue this guy is having but it was the weirdist thing I saw years back ha
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Old 05-04-2019, 09:31 AM
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Iím going with spring failure or he may have not understood how to properly mount the springs and shoes. Like someone said itís a brand new car so bearings would only fail if the engine and diff mesh are way to close, at which point the car would feel like brakes are stuck, if it was high idle or incorrect dead ban (throttle linkage is incorrect and still pulling throttle??) the car would just stay on the gas, if those are not the things happening and it is a rattle and the car just wants to go at idle then itís a spring. Especially being a kyosho I donít expect rattling or a failure of bearings that soon, itís gotta be a spring mounted wrong.
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Old 05-04-2019, 10:35 AM
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Yes. I had a broken clutch spring do this to me a few weeks ago.
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