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…

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

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.

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…

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 …

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…

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.

Hopefully somebody has a full length kickstart lever to fit my SWM tl320, some years ago (20+ ) I replaced mine with I think one off an Aprilia TX/TXR/Climber which hit the footrest so with a bit of heat, well a lot of heat I bent it to match the original lever. I have dug it out from the dark corner of the garage to restore to a usable trials bike ( the joys of retirement) but with the problem of being 20+ years older & having short legs I cannot get it to start ! I have purchased a new one off of Ebay apparently for an SWM but the only part that will fit is the spline Knuckle part the lever is still too short & will fowl the footrest. Pictures are …

hi new to the forum and the twinshock scene. just though I’d introduce myself. my dads had this tucked away in a garage for the last 32years. After a couple of failed attempts to get it running in the mid 90s I though I’d have another go now technology is a bit better. and here the bike is “finished” it’s meant to be a little ratty and rough around the edges. I don’t fancy turning up at some local trials events with a shiney new looking bike and being rubbish haha. I went a little different on the tank

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 …

Here is a video of my 1978 SWM TL320 Engine Rattle. Is it a problem as I have heard several at Trials that sounds the same or louder?

I have a 1980 SWM TL320 that I have a new seat for. The old one was strapped on. Anyone have a good way to mount the seat and be able to take it off easy to work on filter? This one doesn’t have the quick release because at one time it had a metal tank. Thanks

Would some kind soul like to measure the distance between centres on the 320TL front brake stay (Marzocchi forks) for me please? I've now sourced the proper forks and wheel but need the brake stay yet and thought I would manufacture one myself out of aluminium rather than try to source one.

Hello, I'm in the middle of a Tl320 rebuild. Does anybody happen to have a copy of a manual for one? Preferably electronic but not essential. Cheers Steve

Hey everybody finally got a cable from Martin for my decompression valve on my Rotax 320 but my brain won’t figure out how to get that valve hooked up to that cable as the valve wants to be squeezed and the cable wants to pull I know it’s simple I just don’t get it is there anyone who could take a picture of theirs or explain? Many thanks in advance Tarik

Hello peeps, Wondering who's got some knowledge to share... took apart the forks to change seals and fill on my new to me and new to be running again SWM 320 first off one tube had the white end bit inside and the other had it outside (see pic) I assume they should both be inside after looking and seeing damage on the white plastic end bit (may still work) Not sure if it was assebled wrong or slipped past the snap ring somehow. next I noticed the springs are not the same length..... does anyone know how I should proceed? thanks lots Tarik

Newbie here! I've just bought back a 320TL I had 25 years ago and as well as having a bit of fun on it I'm hoping to restore it back to something like it should be (I've already ordered a list of stuff from Martin for a kick off). The main question I have just now is frame colour. The bike is 1978 and was registered with the DVLA in November that year. The frame and engine seem to have been spray painted a very dark brown that looks like black at first glance but underneath is what I assume to be the original black. There is absolutely no hint of there ever being red on the frame. I have seen images online of a very early SWM 320TL brochure where the bike …