FS2 stripping spurs

[baD]

Hoping you guys in here can help - if you have heard of anything similar.

ZX-5 FS2 built out of the box, everything as it should be. Motor slipped and knacked the first spur. No idea what happened to the second or third one!
I've meshed pinion/spurs on buggys for 20yrs, old mod6, 64dp on TCs and lots of 48dp buggys. I've never had this problem before. I leave very little slack.

I'm running a Team Wave RB-50 & 8.5 brushless

It seems to slip worst on breaking, that's when the noise is really bad.

Any ideas, suggestions?

[bert digler]

Originally Posted by baD

Hoping you guys in here can help - if you have heard of anything similar.

ZX-5 FS2 built out of the box, everything as it should be. Motor slipped and knacked the first spur. No idea what happened to the second or third one!
I've meshed pinion/spurs on buggys for 20yrs, old mod6, 64dp on TCs and lots of 48dp buggys. I've never had this problem before. I leave very little slack.

I'm running a Team Wave RB-50 & 8.5 brushless

It seems to slip worst on breaking, that's when the noise is really bad.

Any ideas, suggestions?

have you tried meshing it really tight with only a nats knacker of backlash also make sure there is enough slip on the clutch to take any snatch out,
finally is the motorplate or drives distorted

[carlin]

This is very strange first time i have heard anyone having problems with stripping spurs.

My first question where is it stripping?

Is it on the teeth or inside where the slipper pads are?

Also you say worse when applying the breaks, sounds to me something wrong with the diffs??

[bkelsall]

Hey Bad,

I'm assuming you're knocking teeth off the thing like it's gone to the dentist.

Put a new one on and check that under full left/right lock the tie rod cant contact the spur. This can wear it slightly, weakening it, then it strips because you're only running on part of a spur. Other than this all I can say is aim for a tiny bit of backlash and really crank them bolts up that hold the motor in.

Secondly if something on the car sounds rough as a badger's a*se when braking (and you've sorted the spur stripping out) then look at your front diff/idler shimming. I shimmed it incorrectly when i first built mine and the sound is that of the teeth jumping over one another.

[baD]

cheers for the input

More info/detail
After putting a new spur on the FS2 it sounds perfect, sweet as a nut. Then after a good run or two it sounds like a first generation pred ! I do wonder if the chassis material is such that it exaggerates/amplifies the noise rather than absorbs it. Seems to be a totally different material from all other cars I've had.

The spur is nowhere near any tie rod or anything else, just the pinion.
The pinion(s) is/are in good nick
The wear is only ever the tops of the teeth - it doesn't take them down to bald, it doesn't wear it in patches, but takes the tops off all teeth.
I'll check for distorted plate - it never occurred to me something this thick could bend/distort.
Diffs are smooth - on the loose side if anything.
Never stripped any teeth from either diffs - they are both aok

the investigation continues .........

PS - gonna ensure the mesh is changed from a nats knacker to a baby nats knacker from now on, or at least till I can find what's causing this.

[Rob_B]

I had a simlar problem on the cat, Found out that the slipper was to loose and was melting the inside of the spur which was causing it to move. Run the car with hardly any slip now not had a problem. Not familiar with the fs2 but worth a check.

[baD]

Originally Posted by Rob_B

I had a simlar problem on the cat, Found out that the slipper was to loose and was melting the inside of the spur which was causing it to move. Run the car with hardly any slip now not had a problem. Not familiar with the fs2 but worth a check.

Thanks for input - but it's the teeth points that disappear. The spur centre is perfect.

[Fabs]

Tried a different pinion?

[baD]

Originally Posted by Fabs

Tried a different pinion?

thx Fabs - only 3 or 4

[carlin]

Originally Posted by baD

thx Fabs - only 3 or 4

You say only 3-4 but are they all the same brand ones?

Try diff brand on Pinion, I have some Black Pinions that are perfect then another brand that are pants they used to cause the spurs to shark fin if you know what i'm saying

[RogerM]

I've had the same spur on my FS since I built the car (when the conversion was first released) and it's had little stones in it, mud through it and all manor of debris and it's still going strong!

I have had a spur go egg-shaped on a 2wd car due to excessive use of the slipper causing it to distort.

[bkelsall]

TBH id go with Carlin's suggestion. Ive had a couple of pinions where the hole wasnt 100% correct size for the motor shaft *cough* *Annsmann* *cough* *cough* and the fit was cr*p. But I never used these, rather chucked em in the bin to add to the vast amounts of landfill pollution and poddled off and got some better ones (RW are usually bang on!) Or KYOSHO... of course...

[bkelsall]

Originally Posted by baD

Thanks for input - but it's the teeth points that disappear. The spur centre is perfect.

Oops, just read this... I dont think you are meshing close enough. Right up so there is no backlash and then back it off a touch. OR mesh it with a bit of paper (A4 printer paper is sound) then rotate out the paper.

[baD]

Thanks everyone - guess that proves how good a manufacture K is - as no one else has a problem.

So... it's back to the drawing board as they say, take all advice into account, strip, examine, check & rebuild with new parts where necessary

[RogerM]

Check the alignment of everything, make sure its all secure and not moving during a run and I am sure it will all be fine!

If you need any more help post up a few pictures and it might inspire somebody!

All the best mate

[fastinfastout]

maybe too tight slipper? That can knacker spurs, bevel/drive gears. I always set my slipper to at least so I can just barely turn the spur by hand with wheels locked up.

[RogerM]

The FS is SUPER sensitive to slipper setting and what fast' is suggeting is far far too tight!

Set the car so that you can fairly easily push the spur round with your thumb when pushing the car down into the surface your running on, this car likes it's slipper to slip and it will reward you with a super smooth drive. Obviously you need to maintain good drive out of corners but run the maximum slip you dare without loosing too much punch.

In fact most people we see who think the car is too brutal or complain about having too little steering are running the slipper way way too tight!!!

[baD]

Thanks - the Special K family are better than the Brady Bunch