trialsrfun

The sprocket sizes when the bike (Beta 200) was new would have been 11/42, the 250 (2 stroke) uses 11/41. I have a 250 and run with 11/42. As a rough guide one tooth less on the gearbox end is equal to putting an extra four on the rear wheel so going down to a ten is quite a step but that might be right for you. If you divide the number of teeth on the rear sprocket by the number on the gearbox sprocket you will get the reduction ratio. A gear box sprocket is not too costly so maybe worth a go but either way you need a chain tensioner fitted, the clearance between the top of the tensioner pad and underside of the swing arm is around 20mm.

The frame does appear to be a standard OSSA modified, the cylinder head with the head steady mounts is identical to that on my TR77 model.

A really good build Stuart, hope to see you out on it at a forthcoming trial.

http://www.trialscentral.com/forums/topic/28407-the-beta-clutch-fix/ The Beta problem will go away if you carry out the above

Reading the write up on the Vertigo it states a weight of 65kgs but says that this can be reduced to 62kgs by purchasing other parts, just where can 3kgs be saved from a minimal build trials bike and what might be the cost? I cannot think of any part of the bike where a part could be substituted and save 3kgs that is a lot of weight to trim back.

On second viewing and using pause the pipework to the rad area is visible.

Possibly trying to grab peoples attention away from the other new bike launch.

A great promo video, just noticed what appears to be a cylinder ??? on the L/H side of the bike might it be something like the boost bottle Yamaha once fitted to some of their bikes?

If you have the std sprockets fitted I think 102 links of 520 should suit. I buy Regina because it is widely available & both split & half links can be bought. Do not buy a bulky MX type chain they can catch & often do not go through chain tensioners.

If you visit Todotrial the new engine for the TRS is pictured.

I have a OSSA TR77 250 Verde which has a second chain tensioner spring, this attaches via a special bolt which is one of the two used to secure the chain tensioner block to the end of the arm, the upper end hooks over a bar which protrudes from the inner edge of the swing arm tube. These assistor springs were factory fitted to some OSSA models but I do not know when they were first fitted or to which models.

Beta clutch fix x 3 all successful. My trials riding friend & I own a total of three Beta's, my 250, his 200 & Evo 4T all had the usual will not free when cold problem. First to be worked upon was the 4T, the plates from this were really glue glazed as if they had almost been dipped in the stuff. Next the two 2 strokes, 200 first 250 last. The plates from these two were much cleaner than the 4T but some plates from each bike were worse affected than others, once cleaned and reassembled the clutches on each bike worked impeccably, freeing instantly from cold with a much better action. Thank you for all the information it has been a most worthwhile repair/improvement/modification.

Personally I like the new Vertigo bike, a lot of effort has obviously been put into it. I wonder how the TRS project will compare, does anyone know when that is to launch?

Change the O ring that seals against the float bowl, find one that is a tight fit they come in different thicknesses Pull the bowl off the carb body you will see the one it goes into the bottom of the bowl. This O ring can cause running issues when worn or damaged.

The 200 Beta is a superb bike & yes the clutch fix detailed above is the way to go. My mate did his Evo 4T yesterday with complete success.

Search on here for Steve Sell, he is the person to contact for OSSA parts in the UK.

Proper job

Sadly this is so. Our favoured pastime of motorcycle trials never seems to attract the big money sponsorship that some other sports benefit from or generate enough bike sales to raise the money needed, most of the sponsorship money comes from within the sport itself. The last big money non motorcycle sponsorship was I think from the tobacco companies Embassy, Fortuna, Rothmans and the like. Trials like F1 has never been able to replace this now banned form of income.

Are these forks the straight leg type from the TY250 twin shock rather than the leading axle type from the mono TY ? If so what is the modification regarding the holes please.

The different types of plug are on here http://wemoto.wordpress.com/2012/08/07/ngk-spark-plugs/

Is this suitable http://www.thetwinshockshop.co.uk/parts.php

I think they are being made here http://progressiveclassicproducts.co.uk/contactus.html using the original jigs.

Keith Horsman who had a bike shop in Leeds converted some OSSA MAR's to monoshock & reed valve, also I believe Eric Cheney made some mono frames for the UK importer who at the time was based in Bournemouth. Both types were cantilever rather than what a monoshock is like today.

Does anyone know which of the two clutch assembly illustrations is correct please? The clutch kit sold by BultacoUK/InMotion has 5 steel plates & 4 friction plates so that would mean a steel plate would go first as on the 2nd of Guys postings then finishing with a steel plate under the pressure plate.

When fitting a set of Barnett plates to a 199a am I correctly understanding the above, use 4 not 5 Barnett plates so 1 of the 5 supplied will remain unused then a steel plate first up to the clutch drum then a Barnett plate and so on?