SWM

Has anyone tried removing the perforated tube inside the midbox to make it more like an expansion chamber? With the perforated tube in place it seems that the midbox is really just a muffler. A straight section of pipe would have virtually the same effect performance wise it would seem ,although the exhaust note would be a bit louder(but the bike 2.4lbs.lighter). I am considering combining a gutted midbox and a MX type rear silencer or custom aluminum replica SWM rear box to improve power( and save about 5lbs). I am familiar with making changes to the exhaust systems on piston port engines , but less informed on rotory valve engines, so I am not really sure if this would …

Anyone know the bearing number? I've put the old one down somewhere and can't find it at the moment to get the number. I have to go to the local bearing stockist tomorrow so if they have some in stock I can get some whilst I'm there.

For those that read the "Testing the Pachyderm" article you might like to get a look at the real rhing..... the New JPS edition of the SWM Jumbo. Its on my "Blog" under "Extreme Makeover The Reveal" and has a load of pictures of the beastie in it's new livery. Either hit the blog button or go to www.blackcatvintagetrials.com Happy Christmas to all Tony

Start bidding quickly or you might miss it :- http://cgi.ebay.co.uk:80/ws/eBayISAPI.dll?...ME:B:SS:GB:1123

.....and now a little Christmas fun! Having just rebuilt a Jumbo for a friend it was taken on a test ride. Full report and pictures are on my "Blog" www.blackcatvintagetrials. com or just hit the Blog button. There are all the other articles on the rebuild from scrap to showroom. Happy Christmas Tony

Hi does anyone know where i can get a dating certificate for a 1980 SWM so i can register it for the road. Thanks

Anyone out there know the SWM factory mechanics who wrenched on the Works bikes ? Might be interesting to pick thier brains about engine mods ,ect. Has anyone tried one of the flatslide carbs on a 320? Cheers ,Jim

Any ideas on how to break my SWM 240s countershaft sprocket nut. Penetrating oil is doing nothing. I stuffed a block of wood between the rear wheel and swingarm, sat on the rear tire, applied heat with mapping gas to the nut, and had a breaker bar with a long pipe on top of it and the nut won't move. The chain is still attatched and another block of wood is behind the rear tire and it just spins the rear wheel. I can't see the nut being reverse threaded. I haven't heated the nut cherry red. I think it will hurt the countershaft itself. My impact gun isn't doing half of what the breaker bar is doing. Any ideas?

Hello everyone, well after 20 plus years, I finally did it...I just purchased a well sorted TL320. I have been wanting one of these for years. I'm sure I'm going to have a load of questions for you in the future. I have already reviewed all of the SWM posts and I'm getting quite the education. So, a humble thank you is in order for leaving such detailed information in this Forum. I just wanted to take a moment and introduce myself and wish you all the best, Carl...from the East Coast, USA.

Hello, I would like to know if the rear shocks are suppose to be 14 inches long? Also, are they suppose to be mounted in the front mounting hole or the rear. There are two holes for mounting and my shocks which are 14 1/8 inches long are mounted in the rear position. Thanks, Scott

There seems to be almost no information out there concerning proper setup of twinshock trials bike suspension. With vintage motocross bikes ,suspensions(spring rates) are usually setup by rider weight and ability(speed). What is the best way to determine proper/optimal spring rates and damping on a vintage trials bike? I ride a 1980 SWM TL320 and weigh 235 lbs. . The bike has the original fork springs and works performance shocks put on by the previous owner(weak springs). Seeing as these bikes were designed and the suspensions setup for light riders like Schrieber and Burgat, the stock fork springs and shock springs certainly must be too light for heavy riders. Any thoug…

Has anyone successfully managed to clean up a plastic tank to its original yellow. The tank has gone a darker yellow over the years, usually due to UV from sunlight, and the replacement new plastics are significantly lighter. Just wondered if there is a tried and proven method for restoring the original colour without making a mess of it. The plastic is baby bum smooth at the moment and I don't want to try any method that will rough it up.

I've just become the owner of a rather sad and neglected TL320. (re-living my youth having last owned one in approx 1984) First of many questions to come - can anybody tell me the correct length of the rear shocks. Thanks Ross

Just back from a trial down in deepest France and was really impressed with an Swm out after having a make over. Was interested to learn that the headstock had been moved... swingarm lenthened and exhaust had been breathed over. Was really impressed with the way that it went I was told it was a 1982 280. Are these really an undervalued .., but overllooked alternative in the competative twinshock trials market. Don t know as in many cases, whether the above mods are really worth the hassle and cost and at the end of the day the bike still has to be ridden but I was very impressed with the way it went , I might even be tempted or are they an aquired taste....... Thank…

Hello Please apologise for my bad english! I once heard that top level 320 SWM riders lightened the weight of their magnetic wheel for 0.800 kilos. I just reduced mine for 0.450 kilos, and at first glimpse that gives to me a good feeling: I'm driving much more a trial bike than a tractor. But I'm wondering: must the ignition advance be modified? Thanks Nicolas

we all know the whys and wherefores, and risks of late nite beer and evil bay.... just bought a 320 here, 1980,......"runs perfectly"........ soulds like a tractor on one cylinder were can i get pistons, (nikasil bore?) and a conrod kit? what about airbox and carb rubbers? Martin M?? any idea what a fulll engine rebuild will cost? Anybody recommend anyone to do it. i can only split fanny cos the gearbox doesnt fall all over the place....

Trying to get my bike working again. (Stolen / recovered) An air cooled Aprilia with Rotax engine. The flywheel has been spinning on the shaft after the woodruff key sherred. I think the crankshaft is ok, but the taper on the flywheel has suffered, question is does the keyway start from nothing, or has it been worn away by the crankshaft ? Anybody out there want to sell a flywheel, if required ? The wiring has all been pulled out but shouldnt be to difficult to reinstate. I've got the engine out, head off, but the barrel wont move. Of the 8 studs that secure the head 4 go through to the crankcase ? I've put release oil down and will leave it overnight. Is it best to …

Howdy again Gang! When I took my TL320 down to Moab last month, with a fresh change of the fork oil to ATF, I found that the seals leaked a great deal. I decided to change them, so I ordered a set of seals for 35mm Betor forks. They came as a set of four separate seals, apparently meant to be stacked on top of each other for a double-lip seal. Last night, I dismantled the forks and removed the old seals. The old seals were not stacked, they were a single seal on each side, each with a double lip inside. One fork leg was embossed with the words: "Honda F seal, 9125-273-000". So it would seem that someone had the fork legs machined to accept a Honda seal, though I suspect…

Anyone know of a good source for bushings, seals, and dust boots? Thank You, Aaron

Hey guys what is up. As you can probably tell I am new here. I just picked up a 1973 SWM RS250 MC and i dont know a thing about them. But i am hoping you guys can help. The bike is in really ruff shape right now. I have been told that it runs but it doesnt have a kicker and as of right now he thought the coil or the plug were bad. Were do you guys get parts for these bikes. I would like to try and restore to as close to original as i can. down to frame color( I think it was orange). so if you guys could help me out here. I am mechanicaly inclined and have a background in bikes . I just dont know anything about this bike. Thanks again any help will be greatly apreciated.…