SWM

Hi all, just a bit more info that might help you all out with dragging clutches. As you are aware if you read my other posts, I fitted an Aprilia TX311 clutch hub to my 83 TL320. That along with the 12mm ball bearing conversion did make a huge difference. However, I recently came across a new steel internal clutch arm (the one with the kit is cast aluminium and difficult to extend) which I extended by 10mm, this again made the clutch pull a tad lighter. when riding the bike in practice or events I noticed the clutch developed a bit of drag, not enough to stall the bike but enough to make finding neutral a pain while waiting in turn at a section. I initially thought thi…

Hi all. Right I’m going to throw a grenade in here on this subject. Stock jetting is pilot 60, main 90 X2 needle and 70 slide, this we all mainly know. Right here comes the grenade. I’m running 52 pilot and 85 main to get my plug looking anything like how it should, I’ve gone right through the carb, float needle, float height, new needle, new atomiser, new choke plunger. On stock jetting the bike simply over fuels and the consumption is quite high. We’ve had this problem with another SWM and also a TX311 and in both cases the problem is solved by leaning the jetting. All the bikes pick up a lot better and do rev out ok. A 70 slide is lean and I believe by using a 60/90 se…

Hi all, new on here but have been looking at the thorny subject of SWM clutch upgrades on the TL models. after pulling the clutch to bits several times and not being able to improve the standard set up i by chance got talking to Gary at Sportax Racing, he was able to supply the Aprilia type kit with 12mm ball bearings and also some standards generic to all motors, standards clutch springs. The springs are lighter than the 37mm ones fitted and also shorter at 33mm. The difference is massively noticeable ( just about one very strong finger😁). Apparently the 37mm springs are classed as heavy duty and due to their bulk when compressed, they can foul on the basket and pos…

Can someone offer a recommendation to a carburetor (and jet sizes) to use on a Jumbo (350) ? My Jumbo doesnt have the reeds and is not the rotary induction. A Delorto PHBH 30mm is the OEM carb for my Jumbo. I'd prefer to use a round slide carburetor. So, Im thinking a newer style Delorto or a Nibbi. Im not interested in using a OKO (I rentlessely tried a 28mm with no luck). My Jumbo engine was just rebuilt (top and bottom end) and there are no air leaks. No matter what I do, I can't get rid of a lean condition found below 1/4 throttle....and still have mid and top correct.... it seems to be either or. so, Im at the point to try a new carb. Thanks.

I have a set of OZO shocks on my SWM TL320. They aren’t leaking oil but are very springy/bouncy. They have shrader valves can i fill them with air? If so how much? I know you’re supposed to fill with nitrogen but I have a trials this weekend and no way to get that done right now. But the air would be temporary. Thanks

Hi, has anybody out there had any experience with this type of clutch actuator ? Does it make a big difference or none at all to the lightness of the clutch ?

Introducing myself because I've just brought a '82 320. Haven't rode for 20 years, now live in S.Wales so thought I'd buy a bike to do some trail riding before I get too decrepit (I'm 68!) to ride. Used to ride a Ossa MAR, never in comps though. Don't know much about the brand, apart from it's a pretty bike (shallow reason to buy, but you know!). The bike seems good for the price I paid. It's a bit visually challenged, seat vinyl torn, frame paint missing etc., but seems to run well. Has been used in trials, so I think it's ok mechanically. And some questions! Neutral seems hard to find when the engine is running, OK when engine stopped and slightly e…

Pulled the clutch cover off my Rotax 240 motor (tucked into an Armstrong/Can-Am frame, so thanks for allowing me into the SWM family!) due to the clutch sticking, even after warm. The prior owner ran some pretty thick gear oil, and the motor sat many years unloved. I prefer ATF, but things are still sticky. Discovered five friction plates and six steel plates. Should there be another friction plate? I am in the process of cleaning off the gaps in the plates, as I found some good material on this procedure elsewhere. I've attached the pdf. Appreciate any and all help. Thanks! Clutch_Fix-1.pdf

I’ve finally found the time to start working on the SWM 350 Jumbo I picked up last spring. The previous owner had installed an electronic ignition that failed on him, so he reverted back to the stock point ignition. I reached out to the manufacturer (Rex’s Speed Shop in the UK), sent them the unit for testing, and, sure enough, the electronic ignition module was dead (which, according to them, never happens!!!). I got a replacement ($$), installed it, and got it all set up. The installation is pretty straightforward—you just need the right flywheel puller (which, of course, I didn’t have! 😒). Next, I replaced the rear shocks. The bike had aftermarket Works Perfo…

I recently acquired a 350 jumbo in very nice shape. It has been ridden quite a bit, so I took the top end apart. The piston and cylinder look amazingly good (I did measure with my gages and the cylinder is still within spec. for a cylinder of this size). But, the end ring gaps are about 20 -22 thou. I'm getting the piston coated with an abrasive powder coating product that they use in very high performance/horsepower engines. been doing this to all my bikes for 10 years and have had amazing results. So, does anyone know if OEM standard,1st or 2nd over piston rings are available? They would be an 82.0mm, 82.25mm or 82.50 mm... as needed, I'd file down to fit. From w…

I am the new proud owner of a 1983 SMW 350 Jumbo, in all it's yellow glory. Bought it from a local rider (thanks Wayne!). The engine has been fully rebuilt and has just a couple of hours of riding on it. I guess over the next few weeks (month?) as I get familiar with the bike and start riding it / tuning it to my liking I will have many questions. This Trials Central has been a great source of help in the past so I am turning to you guys again for answers. Engine oil What engine oil do people use? I my (modern) trials bike I use Maxima MTL 80WT. How to verify oil level and refill? There are no oil level windows (unlike my Fantic) and I couldn't find …

I have been wanting a SWM trials bikes since I was in high school in the early 80s. I got to ride a 81 TL 320 for a day and really liked it. It handles as good as some of the modern trials bikes I have had! Has awesome power and torque! I felt very confident on the bike. It took me a long time but last year I finally found a 80 SWM TL320. It's in rough shape needs a complete rebuild, I probably paid way too much and it's still not finished. When it's finished it will be my main trials bike for vintage trials. I would like to find another TL for back up also an Enduro GS SWM for vintage cross country. Where do you find these bikes? I look on Craigslist, eBay all the…

Hi Guys (+ Gals ), can anyone say if the bikes of this age had mineral oil @ the day and if it is still to recommend. The problem with neu oil types are that they seem to make trouble with seals. especialy the SWM has problems with oil leaks and needs new seals for the kicker and gear shaft at regular intervals.

Has anyone tried a OKO carb on there SWM 320? If so how did it work?

Can anyone help me please, I have just bought an 81 SWM 320. The problem is that the engine and gearbox came in a vaiety of boxes and many different parts. As I have never stripped one of these before I am not sure how to put it back together, has anyone got some exploded diagrams, perhaps on cd-rom that I could use this would be very helpful thanks. James

This all wheel drive SWM was built in 1981! It was a Prototype, they competed with it once and the FIM banned all wheel drive bikes. If anyone else knows anymore about this Prototype or have more pictures, please post them!

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.

I have a newer style clutch cover with the larger actuator balls I would like to install on my 1980 SWM TL320. I would like to see if it does pull a little easier and my original cover has a small crack in it and needs repairing. I also have the newer pressure plate. Do I need anything else? The hub from the ATK (Rotax 244) parts book has a different part number than the older style SWM. Will I need to change that too? Thanks

Just been looking at Martin's motoswm site and I see the new system is now available for Rotax trials motors. http://www.motoswm.co.uk/product-category/ignition/

I have just finished a touch up of a total wreck and tried to roll start it today. It seems like the spark, which is healthy fires way too early. It just dead stop the engine from turning with a pffff sound. I mean a spark something like in the middle of the compression phase. The vertical line with a yellow dab of paint lines up with the cylinder when piston in TDC and the line is in the middle of the hole on the stator cover when I remove the plastic plug about where I figure the timing should be. I know nothing or very little of these bikes but I do think that the Bosch 12v 55w system with a flywheel facing outwards, and the stator in the cover is OEM? All …