motovita

The 74/75 models had lighter flywheels, I ran one on my 77 model. I don't think it helped my scores but it made the bike more fun to ride. Get your bike in good working order before making any changes though.

I suggest buying a Domino Trials throttle with a new cable, not expensive and will give you a fresh start. Get some Trials grips while you're at it.

Last I checked Tublisss did not offer a system for 1.85 rim, has that changed? Feetupfun, if there's no photo of the modified rim can you post a sketch of what you did? I can't picture it.

I was considering sealed caps to slow fork compression on hard drops where the fork bottoms out. I found that I could buy new springs for less than new caps, my springs appear to be original with added PVC spacers so I decided to go that route. I decided to try shortening my springs first. I cut 50mm off of one spring and added 45mm of PVC spacer in it's place with good result. My 199A fork still has good compliance on the small stuff and steers well but is a little more stable on steep, sudden, drops, where it still bottoms out. I may play with the other spring later but I'll ride it as it is for a while first.

Have you ever experienced pressure build up beyond what you wanted, or do you have manual vents on your caps? I see Bultaco UK sells a pair with Schraeder valves.

How did you seal the caps?

Was there a left side kick Gas Gas? If so I can't imagine that'd be easy to find.

Any chance you've fitted a tube type tire to a tubeless rim, or vice versa?

Trials tires are superior to knobbies. 200cc should be fine as long as you're not at high elevation. You should try to get a ride on a Trials bike with seat on it to make sure it will work for you. The seat is clearly an afterthought and not that comfortable or practical unless you're on a smooth road, although it might work better for someone with short legs. The effort to lift yourself up to standing position from the seat will probably me more than you're used to. Do whatever you gotta do to keep riding.

The Follow Up I never did find any info about the Leonelli part #, but after being blown off by both North American Scorpa importers, who apparently couldn't be bothered to find the current Scorpa part # which they most likely had in stock, June at Birkett Motorsport came through and posted me the rectifier I needed. Now that I have the new part # I'm sure I could order it here in the USA. Glad to have it sorted out, but it shouldn't be that hard.

All the metal parts you mention are interchangeable with other years and even other brands. Good luck on the plastics. The later Revs airbox was an improvement over yours, but even those fenders may be getting hard to find by now.

Thanks, they also list the part I need here http://www.thehellteam.com/fan-regulator.html I'm pretty sure one of the others will work with just connector changes but I'd like to get specs to confirm so. Note the different terminology regulator vs rectifier.

I've seen them here in the USA using inexpensive dual sport tires, Shinko, Kenda, etc. Whatever fits and has a vaguely Trialsy tread pattern.

Thanks for the advice, I've been waiting for a response from Birkett. Kevin at Scorpa USA, who imported and sold the bike in 2011, told my local dealer that we were on our own trying to find this part. They apparently have no interest in, or intention of, helping source or identify the part.

Yes, it looks like that but with one different connector, which I could change if I knew that they were functionally equivalent.

I need a replacement rectifier for an older Scorpa that, as yet, I haven't been able to source through Scorpa sources. It is the little black box plugged into the fan that most of us have seen on Trials bikes. It is marked Leonelli with a number 1210 stamped into it. I can't find any reference to it on the internet and Leonelli seems to have no presence here in the USA for me to contact. Can anyone suggest where I can find this part or get specs for it so I can replace it with something else? I don't know, for example, if it also regulates voltage or has any other functions.

The 250 pound motorcycle is likely a factor. I think the MT43 may have stiffer sidewalls than the Pirellis you used in the old days.

I believe the Montesa uses a different brand of tubeless rim DID vs Morad (my 4RT did), one might be better than the other but both are used on Trials bikes.

Morad rims with the rubber band as used on trials bikes for many years. Once when riding my KTM across a long off camber slab the tire burped out all it's air but didn't unseat. It takes just the right combination of forces to make it happen. If I maintain a minimum of 6PSI I've never had a problem.

I have two enduro bikes with tubeless rear rims. The MT43 will occasionally unseat and lose it's air at pressures below 6psi. I assume it's a result of the stiff bias ply sidewall.

I don't know who that is but I don't think I'll hold my breath waiting for the bike.

Is the E start Vandal really going to happen?

The two nuts are an anachronism, they were used to clamp the rim between them to locate the valve stem but dirt bikes don't use them and street bikes don't use tubes anymore.

The manual in the USA was on a VHS tape. I don't know if there was a printed manual in the UK you might be able to find or if anyone has converted the VHS to digital that you might be able to access. You might be able to work out some air by squeezing the rear hose rapidly with your fingers. BPR5ES plug should work fine.

I hand formed a piece of flat steel to replace the loop that was impacting my sensitive parts on descents.