SWM

My 350 Jumbo had a 15 tooth countershaft sprocket which looks gigantic. Does anyone know what the original set up was for front and rear? Also are there supposed to be spacers between the front sprocket guard and the engine cases? Thanks

Thought I was paying too much as Ebay ad said it didn't run,but by the time I did the "Buy It Now" he'd got it going.Engine sounds terrific! Runs beauty! So Smooth,quietest running 2stroke I've ever heard :-) Gonna need alot of tweaking to get it as effective as My Fantic 240,but progress is already being made,have clutch down to easy two finger/OKay but distracting 1 finger action,will try taking out a couple of clutch springs next.Brakes are strong,rims round,tires hard as stone ;-) no oil in forks,rear shocks leaking from not being ridden. Footpegs are miserable,will cut those pristine mounts and never tweaked(Or even come in contact with anything other than a bootsol…

I know there’s already chat and opinions from some time ago about these, but anymore up to date info from peoples experience since the last threads. Thanks guys.

I got tired of waiting for replies from a couple of sources for trials electronics and was surprised to see a mail in my inbox after almost no waiting at all. The guys at Powerdynamo in Berlin are of a different kind, both answering mails and getting things done (!). After sending my old parts to them, I got a nice, big box a couple of weeks later, old parts in return and a new system for my bike. I run a simple battery total loss set-up for lights when needed, so my new system is ignition only. If you are interested, the system is now listed among Powerdynamo's other products, so you don't have to bother sending anything to Berlin (if you need power for your lights …

Ok chaps, Just about to split my 1982 TL 320 for the first time, plenty of experience of Spanish twinshocks but not Rotax motors. So rather than just go at it I thought I'd canvas opinion about what to watch out for and basics, i.e. which case to leave the box in, etc, etc. Thanks all.

As above, the exact colour or colour code for the SWM frames still eludes me, I was told the Subaru WRX blue (code 02C) was a close match, and indeed it is close but still not close enough for me. I know I'm being pedantic here, but since I've started paint stripping my Jumbo which was obviously re-painted in the wrong shade of blue by a previous owner (refer attached pic), I have found traces of the original slightly metallic and darker blue underneath and it's not quite the same as Subaru WRX blue. Any advice appreciated. Also still chasing info on my previous post regarding seat/tank/shroud arrangement.

Hi guys, Picked this up at weekend as a winter project, runs ok but rough. ( sorry can't load the photo of the bike ) The question is, I went to check the points and the flywheel nut was hand tight. Took it off with the flywheel and it was really wet and oily at the rear of the flywheel. Began to delve in as you do ( only use to Bultacos ) and I was stopped by the large disc that is retained by three large screws. I can get it to rotate but not release, it seems to house a bearing on the crank, how do I get it off guys. And yes for you eagled eyed chaps, the woodruff key is mangled, I've no idea how it ran, it fired up first time. Many thanks.

Hi, has anybody out there had problems with Venhill cables ? I ordered clutch, throttle and frontbrake cables for my 81 125 and 320 and have had the following problems. The brake cables were too short and could not be fitted to the bikes any way even though the cables listed were for Marzocchi forks. The throttle cables fit as long as you only connect one end. The inner is too short or the outer too long on both, whichever way you look at it. The brake cable issue has been solved. Venhill changed them, no problem but now I'm trying to get the throttle cable problem solved. The picture shows the throttle end with the carb end in place. Even when all of the…

Can anyone post some pictures on how the seat is mounted on the 1980 TL320?

I bought a 1980 SWM TL320 last year that was in need of a lot of work. I'm fixing it up to compete in vintage trials. I'm replacing the swingarm bushings and have had a heck of a time just removing one bushing. Anyone have a better way to remove and replace these bushings? I have a few different ideas but thought I would ask here for some advice. Thanks

Well I couldn't remember when I removing the clutch basket this morning if the nut was RHT or LHT, googling didn't help and as the basket revolved clockwise I thought well it would be LHT....wouldn't it? But before I got my windy (well main'sy) on the bugger and had an exploding first motion shaft (or would that be input shaft?) I thought I'd better get on the blower to the font of everything 'Speedy Working Motor', his Holyness and the Right Reverend Mr Matthews. Martin confirmed that the thread was indeed RHT and that are no 'trick' threads on an SWM...so hopefully the next person with the same problem will hit google and find this thread and think ahh that wa…

Hi guys, just a quick hi, not been around for a while....my fleet of Gixers, other roadbikes, new to me Firestorm, track day car & my love of track days at Snetterton has kept me busy from realising my dream as a World Trials 'Chump'. OK, I dug Speedy out of her hibernation and couldn't free off the clutch, no matter what I did. Next weekend tried again and finally got her to free off but with terrible clutch drag. So yesterday (these things take time!) I stripped the clutch down and my gearbox oil was contaminated with water (again) looking for all purposes like she had done a head gasket - as if watercooled - she was that bad. See…

I am sure its on here and been discussed before, but could some one just remind me the weight and amount of oil per leg for a jumbo please. Thanks

The Rubber connector from the carb to the disc valve inlet manifold has split on my TL320 Does anybody now a fix or where a new one can be purchased

Hi all, I have got a 1982 / TL320 in the workshop to get the rear end sorted with a new tyre, brake shoes chain and sprockets etc.. I was was quite surprised to see that where it has been standing a small amount of oil has been dripping from one fork leg. The seals are almost new (fitted in Okt. 2016) and the bike was used once for about 1/2 h before weather stopped me. The chrom and the seals seem fine. Can it be that air pressure is building up in the fork leg ? Does the fork cap have a bleeding valve and when it does should it work in both directions ? The forks are the last 35 mm Betors and silver coloured that just have one 35 mm x 47 mm x 10 mm seal (not like i…

After much neglect I've gotten back to my Jumbo 350 project bike. The previous owner was about 90% done with the restoration when he took ill and was unable to complete. It's missing the front brake lever and I'm not sure what kind of throttle and clutch levers are on it. Could someone please tell me what levers and throttle were originally used on this bike? I'm hoping they used the same Domino gear that was on the Fantics as they work well for me. If possible I'd like to stay original or at least period correct. Also regarding the secondary clutch lever under the tank (not sure what else to call it) is angled slightly off of 90 degrees. Should it lean towards, or a…

Hello ppl, does anyone know if Jumbo forks ever left the factory with these overly long blue fork boots ? The boots on mine are much shorter black jobs, possibly not the original dust boots/covers. Refer attached.

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 …

What's considered to be a good compromise angle for steering angle ? Currently about 23 degrees. Thanks

Hi, I fitted new carbs to my bikes and did some testing on Sunday morning. Also tried my action cam out for the first time. The 320 is sorted but the 125 still soots up the plug after a short while. I'm scratchin my head and a few other places besides. The carb is brand new, original spec. I have fresh 102 octane with no methanol mixed at 50:1 full synthetic oil. The exhaust has been cleaned and the middle box repacked. The timing is spot on and a brand new NGK BP5ES plug. The filter is clean, there are no leaks, new crank seals. To be continued...........