midgy

I saw two for sale (slightly used) but pristine in a well known Glasgow dealership this week. Very good prices. Was almost tempted to purchase but my garage is bursting at the seams with bikes.

Sorry for asking again, as I can see that there are many questions, answers and opinions about various vans, and car variants for transporting trials bikes. But before making a purchase, for clarity, do members on the forum reckon that a trials bike will fit inside a Peugeot Partner Tepee. (And not a WAV vehicle). The ones I am looking at are the shorter type wheelbase car type variant. Many thanks

Hi Woody, Thanks for the info. I think mine was just a cosmetic type of 'vesty replica', since as far as I can see it is standard B model apart from the engine size having been increased at some stage. It was Pete (Bowker?) at In Motion who said:- "It was one bike of a batch of 110 that was converted/made into a 'Vesty replica' 250 and was sold by Comerfordsinstead of going to a dealer. So it was a standard production model 198B with a few modifications." It was also fitted with a plastic tube type chain guard on the top chain run like a Montesa 348/349 had at the time.

Hi Guys, Having now fully cleaned up my 198B barrel and cylinder head, the top of the barrel and the underside of the head are stamped 137. It has been over-bored to 73.75 giving 256cc. Do the Bultaco Sherpa gurus suggest my head and barrel came off an older 250 Alpina 137 from 1974/1976? The bike was apparently supplied directly by Comerfords in early 1982 as one of about 110 bikes supplied and sold by them, and was allegedly billed as a 'Vesty Replica' Or perhaps just put together by Bultaco factory using what was just lying around? And presumably over-bored to the max early in its life? Ideas appreciated. Thanks

Many thanks for everybody's advice. Will be trying the RHT stuff as suggested by Woody on the Bultacos and a Suzuki road bike. Might be a month or two before bikes are ready for testing the paints but will update later on how it all works out.

Hi Guys, Can anybody suggest the best high temperature paint for exhausts. I have used rubbish stuff previously (from Halfords) which just dissolves when petrol is spilled on it. I even cured the casings and exhausts in the oven to try and get a good result. Don't want to get lumbered with the rubbish stuff again. Also similar suggestions appreciated for high temperature lacquer that will not dissolve. Thanks

The piston diameter on my 198B is 73.75 giving a size of 256cc. The underside of the piston is stamped DINAMIN, and although the piston and bore are in good condition I wonder if anybody knows if this was a fairly standard mod just to maximise the capacity rather than being overbored so many times over the years for some strange reason. Also does anybody know what bike would this piston? might have come from? GasGas perhaps?? The InMotion site shows piston sizes up to 73.00 only. Thanks.

Thanks guys for the colour info. It is just I thought the blue shade on the forks and yolks on the 199B models seemed to be different to the blue on the 199A frames.

Does anybody know if the blue colour on the 199A and 199B are the same, or is the 199B a different shade of blue? Especially the blue on the fork sliders and the yolks on the 199B Thanks

I have bought O-rings from Simply Bearings. They do very detailed descriptions of the various materials (there seems to be about 7 different types of material) for zillions of O-rings of all shapes and sizes from less than 2mm to 600mm and beyond with details of various chemical resistances. The link is:- Choose Nitrile, Viton, EPDM, O-Rings Seals by chemical resistance and temperatur (simplybearings.co.uk) They do not seem to sell single o-rings but sell usually a pack of 2. Fine for me because I needed 2 for two identical bikes.

Hi there, I owned a 200 Rev3 but it was sold for a newer 200 Evo. I found the Evo a long time to get used to and even many years on I sometimes wish I still had my Rev3, as I found it to be a really good bike for my age and experience.

Thanks for the comments everybody. The engineer who is doing my hubs is long experienced and highly regarded and knows what he is doing. The liner being pressed in with 2 thou interference fit is of suitable material. My liner has an OD of 129.96mm and an ID of 125mm. The standard chrome lined hub is 125mm ID. The hub assembly with brake shoes fits perfectly within the liner.

Hi, Many thanks for your comprehensive and detailed guidance. I am aware of the risks involved and accept that the liability rests with myself. My man is aware of the risks as well, and hence he was looking for a specific specification which I appreciate is not available. I explained to him that the bike is for trials and not high speed or even road work and the likelihood of the drum heating up and coming loose is minimal. Considering what you have said, I may suggest to my engineering shop man (a one-man enterprise, and with highly regarded expertise with engines etc) to machine the hubs to accept the liner with an 2 thou clearance. ie the liner outside diameter to be 0.002 oversize to the hub for safety. I am not too sure my man would heat the hub in the oven and freeze the liner, but I may do that myself, if I ask him just to ream out the hub to the 0.002 thou below the liner OD. Then I could tap the liner into place myself. I may also consider using a resin as well to take up any irregularities within the reamed out hub, I appreciate your assistance and will let you know how I get on. Regards Ian

Hi Guys, My local engineering company who are to ream out and then press in the steel liner into my back and front hubs has been asking what the interference fit should be. Too small and the hub might crack. Too large and the liner may come loose. My man thought it might be either 4, 6 or 8 thousands of inch. He is reluctant to take it on unless he has the correct spec that works. Any guidance appreciated. Thanks

Hi Thanks for the info. I have done it before a long time ago, and I will likely try it again. I have taken all the off set measurements and will give it a go, once I get the hubs back from getting a cast iron insert fitted to improve the brakes.