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Old 03-04-2008, 01:00 PM   #1
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Default G4S striping spur gears - HELP !

Hi guys

I need some help ...

I have a G4S plus Picco reddot evo3 engine using kfactory ufo2 clutch setup.

spur gears 46 (2nd) and 51 (1st)

problem is, that my 2nd speed spur gets striped ALL the time. I went through 4 !!!!! spur gears in last 2 weeks ... the mesh is perfect, I also had other racers look at it and they said its good before I took it out on the track and striped it again. I changed the engine mount screws too using locktite thinking that the engine is shifting. No difference.

what could be causing this ? Any thoughts ? I can't change spur gears after every heat ... !!!!!!!!
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Old 03-04-2008, 01:44 PM   #2
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If you are using the Duro 2nd gear housing, make sure you use the correct Duro spur gears.....

The right gears will have 3 holes drilled.

If you try to use non-duro spurs, whilst they still fit and mesh up ok, the spur itself sits approx 0.5mm away from the spur gear housing and allows the spur to flex and strip out.



Do you have any pics of your stripped spurs??
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Old 03-04-2008, 04:47 PM   #3
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Hey Alex you need to get the duro 2nd gear housing and clutch shoe duro and all the spurs duro needed that should fix it.rcmush has it all in stock.
cheers
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Old 03-04-2008, 11:06 PM   #4
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also check the bearing play in the 2 speed housing, they get worn a bit over time and cause the housing to wobble.
Another cause for the stripping is if you have too much clearance on teh 2 speed clutch, if it does havea larger gap it will make the clutch change too viscious.
Adjust the shoe till it touches the 2 speed housing and then back it off a bit.
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Old 03-05-2008, 01:41 AM   #5
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Quote:
Originally Posted by Omarko View Post
Hi guys

I need some help ...

I have a G4S plus Picco reddot evo3 engine using kfactory ufo2 clutch setup.

spur gears 46 (2nd) and 51 (1st)

problem is, that my 2nd speed spur gets striped ALL the time. I went through 4 !!!!! spur gears in last 2 weeks ... the mesh is perfect, I also had other racers look at it and they said its good before I took it out on the track and striped it again. I changed the engine mount screws too using locktite thinking that the engine is shifting. No difference.

what could be causing this ? Any thoughts ? I can't change spur gears after every heat ... !!!!!!!!
there are a few things that can make this happen. as razzor said , big gap on the shoes to housing, makes for harsh engagment of the 2nd gear.
endplay of clutch. if you are using the ED trans, the clutch bell can hit the spur on the edge, causing it to get twisted, big endplay causes the hitting of the spur and bell.
side plates. using the carbon alloy side plates, you cant get the engine back far enough to stop this happening even if you have minimal endplay. i used a dremmel to take some carbon and alloy where the engine screws are on the back plate.
also bearings, 2 speed shaft, and 2nd housing. any play to make the spur move away from the bell isnt good. clutch bell bearings can be a problem as well. try to use the servo screws for the engine mounts, gives you that little bit extra engine movement, the heads are smaller.
as SP Racer said also, if you are using the duro 2speed, make sure you have the right gears on the housing. should be 3 holes in the spur gear, matches 3 holes in the housing. hope everyones suggestions sort this out. it is a frustrating problem for sure, and costly.
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Old 03-05-2008, 07:31 AM   #6
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I've had this problem in my Kyosho RRR. I sourced it to bad clutch bearings. The bigger inner bearing on the clutch was bad and had too much play, it would strip 2nd gear in 5 minutes. Chech to see if the clutch bell has too much side to side play.
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Old 03-05-2008, 12:47 PM   #7
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hi guys

thank you for all the responses !

will have a play tonight if I get a chance ... I think the 2nd speed housing was duro and I was using non-duro spur gears so that could be it ....

but the clutch set up may be a culprit as well ...

stripped spur gears here - LINK CLICK HERE
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Old 03-06-2008, 01:58 AM   #8
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seeing that you stripped 2 spurs on 2 different housings id say double check you dont have excess clearance on teh 2 speed clutch.
If you give tehcar a rev while holding it it mustnt buck.jump in your hand when it changes gear and also the engagement you shouldnt hear the click as it changes but rather the change in engine tone.

I found the 2 speed clearance to be a major culprit of stripped 2nd gears especially on the Mugens.
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Old 03-07-2008, 10:58 PM   #9
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Default need more advises...stripped 2nd gear!

hi all,
need more advises from u guys here...

my frd's ED G4S has been stripping his 2nd spur gear.
intially he was on std housing and gear. after going through this thread, he changed the following (just to be sure... ) :

1. 2speed shaft bearings, clutch bearings.
2. changed to duro housing, gear and 2speed shoes.
3. clutch endplay seems ok. about 0.1-0.2mm.
4. 21T pinion.

after doing all the above, his 2nd gear still strips!

next we tried just swapping the std clutch bell with 24T (non-ED), and it was ok, no more gear strips...what's going on here?
the ED 21T is the culprit it seems.

any advises/comments?
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Old 03-07-2008, 11:43 PM   #10
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Quote:
Originally Posted by keavze View Post
hi all,
need more advises from u guys here...

my frd's ED G4S has been stripping his 2nd spur gear.
intially he was on std housing and gear. after going through this thread, he changed the following (just to be sure... ) :

1. 2speed shaft bearings, clutch bearings.
2. changed to duro housing, gear and 2speed shoes.
3. clutch endplay seems ok. about 0.1-0.2mm.
4. 21T pinion.

after doing all the above, his 2nd gear still strips!

next we tried just swapping the std clutch bell with 24T (non-ED), and it was ok, no more gear strips...what's going on here?
the ED 21T is the culprit it seems.

any advises/comments?
the 21t is std gearing for the pinion. i have used all the gearing options, no stripped spurs.
what he has changed shold have fixed the problem. but it hasnt. so what gearing, pinions and spurs is he using. and how is your 2 speed adjusted. try an early engagment, and less clearance on the shoes to housing. , then just triple check all the basics. take off 1st gear, set your 2nd gear mesh, have a look at whats going on. if 2nd mesh is good by setting it first, then put back 1st gear, see how good the mesh is. maybe that the engine isnt straight on the chassis when you set the mesh, cause you cant see 2nd gear. it may have too much pressure on it, or the mesh isnt good to start with. see what you can see, then get back, maybe with some pics of the stripped gears.
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Old 03-08-2008, 12:26 AM   #11
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Quote:
Originally Posted by keavze View Post
hi all,
need more advises from u guys here...

my frd's ED G4S has been stripping his 2nd spur gear.
intially he was on std housing and gear. after going through this thread, he changed the following (just to be sure... ) :

1. 2speed shaft bearings, clutch bearings.
2. changed to duro housing, gear and 2speed shoes.
3. clutch endplay seems ok. about 0.1-0.2mm.
4. 21T pinion.

after doing all the above, his 2nd gear still strips!

next we tried just swapping the std clutch bell with 24T (non-ED), and it was ok, no more gear strips...what's going on here?
the ED 21T is the culprit it seems.

any advises/comments?

Bud great that you checked all the above but check the following as well.
Clutch gap to .5mm
Most importantly the 2speed clutch gap must be adusted as close as you can to the 2 speed clutch housing.
I will take some pics a little later and post.
This i found to be the main culprit for 2nd gears stripping.
I always check these and adjust them regularly and have yet to strip a gear.
Like Patto said also check that the motor is lined up so bothe 1st and 2nd gear have a good mesh.
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Old 03-08-2008, 12:31 AM   #12
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Quote:
Originally Posted by Pattojnr View Post
and how is your 2 speed adjusted. try an early engagment, and less clearance on the shoes to housing.
his 2speed is considered early enagement. how u do adjust the shoes to housing clearance? isn't it fixed with new housing and shoes?

btw, he's using std gearing, 16/51 and 21/46...
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Old 03-08-2008, 12:36 AM   #13
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Quote:
Originally Posted by razzor View Post
Clutch gap to .5mm
Most importantly the 2speed clutch gap must be adusted as close as you can to the 2 speed clutch housing.
I will take some pics a little later and post.
This i found to be the main culprit for 2nd gears stripping.
I always check these and adjust them regularly and have yet to strip a gear.
Like Patto said also check that the motor is lined up so bothe 1st and 2nd gear have a good mesh.
how do you adjust the 2speed gap?
btw, gear meshing has been ok for 1st and 2nd.
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Old 03-08-2008, 12:50 AM   #14
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On the 2 speed shoes you have the grub screw that puts tension on the cam in the centre, this is what you use to adjust the gap. Make sure you put on some lock tite or super glue so when its set it wont get loose.
The outer screws with the springs are for adjusting the shift point so always adjuts the equally and not on one side only.

Put teh shoe in the 2 speed housing and turn the grub screw till the shoe just touches the housing then back off the grub screw so the shoe spins freely but with minimal gap.
Once this is done you can fine tune your 2nd gear change when running the car. You will notice teh gear change will be a lot smoother and quiter.
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Old 03-08-2008, 01:35 AM   #15
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just a couple of simple things to also make sure is ok , is the engine mount itself and engine screws.
i went through 3 spurs , mainly 1st. i had engine to mount screws on one side loosen. mesh is ok when not under power. under power the engine would lift up slightly on one side resulting in stripped spur.
then i had a 3 racing one piece mount crack into 3 pieces. the engine also twist up and resulted in stripped spurs. but these are mainly 1st spurs that went. set your 2 speed shoe gap and then see how it is.
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