motovita

I have seen a compression release added to a Gas Gas head. the coolant passage was sealed by O rings. I don't recommend it. Shimming the cylinder up not only increases the combustion chamber volume but raises the exhaust port as well, further lowering combustion chamber pressure. It also changes port timing and will alter the way the engine runs. It is easily reversible though. I would recommend a 1mm shim if you decide to try it, I have a Gas Gas Pampera that came with a 1mm aluminum spacer under the cylinder. What this world really needs is an electric start Trials bike for gimpy riders like me. The weight and size of modern batteries and starter motors is negligible.

I finished the Trial last Sunday with a score in the 60s, the winning score in my class was in the 50s (it was raining and extra slick), and felt good about it. I had 6 cleans in 27 sections, that's about as good as it gets for me. I'm kinda old and gimpy and don't ride for the win. If I can finish the event with a respectable score and a few cleans I'm happy.

Reading between the lines here it appears that riders in north America expect and appreciate a more challenging, higer scoring Trial (or perhaps we just don't ride as well), than those across the pond. If I finish a Trial with ten points or less I consider it a poorly set event and don't feel that I got my moneys worth (I know I'm not that good a rider). The standard I was taught many years ago is one point per section ridden from the winning rider in each class, except the lowest class, Novice, since they are the only class without the option of moving down a class. We typically ride 24-30 sections at an event.

I think that Honda spends more on dinner for their dealers at a dealer meeting than the U.S. Trials importers spend on our sport in a year. Honda would probably spend more by accident than U.S. Trials importers do on purpose. Having Trials bikes in mainstream bike shops would be a huge shot in the arm for our sport. I believe that would also improve the market for the existing Trials importers. Honda offers promotional financing and regular business hours, among other things (you may have noticed that Trials bikes are getting expensive). Also not everyone is satisfied buying a new bike out of someones garage, or the pole barn behind their house, as is the case with many Trials dealers in the U.S.

The O ring asked about in the original question is a common replacement part that should be available from any Yamaha dealer. It fits a million different models and many dealers will have it in stock. I just pulled a box of TY350 parts out of my barn. I haven't sorted through it yet. I saw kick and shift levers, many gaskets, clutch cable, and some suspension linkage parts, brake shoes, all N.O.S. If anyone needs anything like that let me know and I'll see what I've got.

Yes they are available here. I have a Scorpa that came with them. In the first 20 minutes of riding in the rocks the sidewall developed a long crack (not a cut). That left me un-impressed with the tire. And I would prefer a tire with a tube type bead anyway.

We don't have a TT Mitas here in the USA. I agree with your opinion of the Pirelli, that's what I'm trying to avoid. I should explain that I'm considering this tire for trail and possibly vintage bike use. Not for modern Trials competition. Conditions that I used the TT Michelin succesfully for before it was discontinued. The IRC wears very quickly when used on paved roads, which I usually ride for some distance to get to the trails.

Has anyone used or seen this tire? They are available in the states now. I wondering if it is a suitable replacement for the discontinued Michelin tube type 4.00x18. It might be a good tire for vintage bikes.

Sounds like your clutch may be dragging. Did you change that oil also? It requires much lighter oil than the gearbox.

Where can one find info on the 200?

Riding saturday is no problem. There's plenty of rocks under the powerlines that aren't being used this time. The marshal and some helpers will be there finishing up. I hope to be there for a short time saturday. seeya

Camping will be nice. The pasture has been mowed and the night air is cool. Usually it's either Canadians or Montana guys that camp overnight. I haven't heard from any of either other than you but someone always seems to show up. Louis, a newer rider who is rapidly rising through the classes lives at the site. Be sure to look me up in the morning, Jeff, the bald guy on the 4RT, as I have to leave early. seeya there

I'll be there, c'mon down. I was up there building sections until dark tonight. I suspect all classes will start at 10:00 amd group check cause we're a bunch of weenies and it will be hot in the PM.

I'll try to bring a load of Americans up. Will there be vintage classe(s) also?

Will there be a 2013 Ymir Trial?

No it isn't!

Has any one had any experience with the "Tourist" version of the Irc tire? http://www.irc-tire.com/mce/tires/tr011.html

So I heard a rumor there's a world round in the states this year. Anybody know if thats true?

Wow in the 40 plus years I've been riding Bultacos thats the first time I've ever heard, or seen, "bomb proof" and "Bultaco" used in the same sentence! If you can keep a Stormer running, I suspect you can keep a Pursang running as well. Go for it.

I'm in Moab til friday. Sent you a PM.

Tony The link to your blog/website doesn't work for me. It looks like there's some good information there. Is there another address for it?

I believe your local Honda dealer can order those screws for you if you provide the part # (90106-KY2-701). Trials specific parts are not stocked by Honda in the USA but parts like screws may be used on products that are serviced by Honda in north America could well be available to USA dealers.

What bike is that?

It's almost like we were neighbors eh. Many of us ride on both sides of the border, In fact some of my best friends are Canadian... although I wouldn't want my daughter to marry one .

New WTC rules for 2013 nationals World Trials Canada The WTC national trials council has announced new rules for national events. Organizers of non-national, WTC-sanctioned events are still free to use Rule 4i, which provides for these rules to be tailored to local preferences. Changes to scoring. A new paragraph is added to rule 4d (definition of a failure) which reads as follows: "any part of the rider remains in contact with the ground for a period of approximately five seconds (during which the observer counts aloud from 'one' to 'five'), while the the machine remains stationary"