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Swm 1982 Clutch Fix


reginald
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You have to replace the counterweight, which is easy enough as all the Rotax enduro motors use the correct nut.

For the "eagle eyed" amongst you.........its also possible to use a kicksart with this case :blush: I broke this one before I rode the first section and had to bump start it all day.

Martin

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Is that your comp. bike that was written about in Classic Dirt Bike magazine Martin? Regardless - tidy bike !!!

Dave from classic rider 444 mentioned this wasn't a huge benefit to the action of the Aprillia style case and actuating arm?

Whats your opinion?

Edited by reginald
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Did you adjust the screw on the clutch arm when you swapped the cases ? If not unscrew it a quarter turn at a time (take up the slack on the cable) and see if that cures it.

If not it sounds like clutch springs. I rebuilt an Aprilia TX300 recently that had exactly the same problem. This one was running on 4 clutch springs and was super light in the first 3 gears and slipped like hell in top. I stuck another 2 springs in and it cured it.

That fixed it - thanks for the advice - While the screw had similar distance out from case mechanism this obviously would be different on the two bikes due to clutch plate thickness/wear etc - so adjustment as per the owners manual you supplied way back when did the trick. Also the cable nipple had slipped up the actuator arm slot so i got some adjustment back at the lever as well by closing that slot. I'm now running 4 XR valve springs and 2 SWM standard [?] springs - light at the lever and no slippage in 6th. Still doesn't fully disengage using two fingers but isn't an issue for non stop and a little rear brake if I do stop- very happy with set up now.

Edited by reginald
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Yes its the bike that was mentioned in CDB, although it doesn't get used much as I am mainly riding enduros on SWM's this season.

The Aprilia case is a big benefit, apart from the action which is loads better than the standard set up, the case is a lot slimmer, its 2 piece - so you can change the plates without removing the kickstart and you dont get the "kickstart punching a hole in the cover" problem.

Glad you got your clutch sorted.

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  • 5 years later...
On 23/9/2010 at 3:40 AM, reginald said:

Hi Guys,

A very helpful past owner of my 1982 tl 320 let me know how he set the clutch up. As follows:

 

  • replaced clutch springs with 6 xr 650 valve springs A$35.00,
  • whacked on a venhill clutch cable and
  • uses a magura lever rather than standard

 

It works like a ty now, its great. I believe the plates were replaced with barnetts but still confirming that.

Hi, I have an aprilia TX 300 with the engine block (crankcase and clutch) of an aprilia climber. Bring the original air-cooled cylinder. I would like to leave the clutch softer and I am looking for some docks to make it softer. Being a rotax engine may be worth the other models. Can someone help me? I will be very grateful. Thank you very much.
Narciso

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  • 1 year later...
On 9/24/2011 at 5:15 PM, b40rt said:

2.10 = part no 239.620 16.6 wide

2.34 = part no 239.625 16.80 wide

2.46 = part no 239.741 18mm wide

All 7 coils.

Think 239.741 must be standard, I'm currently running 3 x 620 + 3 x 625.

@midlife

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  • 2 months later...
 
1 hour ago, baldilocks said:

B40rt who supplied the rotax springs ? On my tx300 , after a month of eating protein bars and going to the gym I can just about pull the clutch with one hand! 

Glen, that was back in 2011, got the springs from Peter. Can Martin supply ? Or failing that the ex army Rotax people maybe ?

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  • 1 month later...

At the recent Mont Ventoux trial I saw a novel SWM clutch fix on a 320 that I can pass on, sadly no photo's.  This bike had been restored and well fettled and it had a pully / cam which had been attached to the frame just below the bottom of the petrol tank. This allowed the routeing of the cable to be a straight pull up from the crankcase. This coupled with the longer arm and larger ball bearing kit made it a one finger job... and kept the original case... I have to say out of all the Swm clutch's I sampled over the weekend, was by far and away the best.  Et volia...

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