stpauls

16 years on from the last post! Just bought a mint Fantic 200 Trial, rear kick. 1982 (according to the date stamp on the tank). Sprockets are 11/52. Rode it in two Trials this week. It is a little bit quick in tight sections, so I have ordered a 10 tooth front sprocket to slow it down a bit.

Google claims 500cc

In your opinion which parts have "been done rather well"?

Yes, when you can get them!

The engine in an RTX is Russian! A Minsk 2 stroke engine that was made in Balerus, Russia.

One reason to extend the swinging arm by 1.5 " - 2.00" inches is to keep the front end on the ground when accelerating uphill.

Check all of the above suggestions first. Then: Has it had a big bore kit fitted? 143cc or 163cc? If the ticking is unusually loud then it could well be that the balancer weight (part 9 in the attached schematics) is hitting either the skirt of the new barrel, or, less likely is hitting the skirt of the new piston, when this balancer weight is near TOP dead centre and the piston is at BOTTOM dead centre. If you look closely at this weight it has a small flat spot on the left hand side of the weight. It is this which hits the barrel's skirt, unless the skirt has been shortened by 2 or 3 mm at that point. The same for the piston, when it is at bdc and the balancer weight is near tdc. Make sure that you reduce both sides of the piston by equal amounts. https://www.cmsnl.com/yamaha-ybr125ed-2006-3d94-england-1e3d9300e1_model43811/partslist/0003.html

Honda Elsinore 125. The tank is a standard Honda TL, with scallops cut out of the sides.

Just stick the carb off the old engine onto it.

They are here: https://www.baselinemarine.com/shopexd.asp?id=544

Airoh helmets STILL have buckles that rust through. I have been investigating stainless steel buckles for 20mm webbing straps, but can only find them for 25mm webbing straps. Anyone found a source of stainless steel buckles for 20mm straps?

2021 Sherco ty 125f Adventure. This bike is fitted as standard with a Jianshe Yamaha YBR 125 engine, made in China. I had serious issues with the kickstart and gearbox mechanisms, so I have now replaced the entire bottom end (apart from the flywheel, stator and flywheel engine case) with the complete bottom end from a Japanese made 2006 YBR 125. I retained the up-rated 150cc barrel and piston. I also kept the complete Jianshe-Yamaha head. I can detect no difference in performance between the two motors. Differences include: the two stators are different. The old flywheel is 300g heavier than the new one. The crank shaft cam chain sprocket on the old motor has one tooth less (or more) than the new one. They are not compatible, so you have to change BOTH for one or the other (the ratios remain the same).

"Shorting out on points cover". I sent my bike to two garages. Neither could sort it out. Finally I was looking at the engine when I noticed a little black mark on the inside of the points cover. It was arcing across to the cover and shorting out,

In 2013 the Beta Evo mudguards/fenders were made of glass! Really careless that Beta haven't solved this issue. They deserved to loose market share to TRS et al.