mcman56

Are there any secrets to removing the chain tensioner pivot bolt on a 2018 300 4rt? So far I have tried penetrating oil, heat and a few heat cycles. Does a steel bolt thread right into an aluminium pivot?

Has anyone done this? Could the Evo 4T share cases with any other Beta models so it may be possible with factory parts?

I had an 2001 and it also had the twin piston rear brake. I don't know when Beta went to one piston. I believe 2000 had USD forks. This may help https://en.vindecoder.pl/en/

What you are describing sounds a little like this but Honda did not buy Montesa until later. TL250

Does this bike have higher compression?

When I first moved to a Beta, a 2008 model, I found the brakes to be too grabby for me. Someone suggested cutting an X in the pads with a hacksaw to reduce the brake force. I did and it worked for me... at least on that bike. Later, I liked the more powerful brakes.

Yes, it can be removed. IIRC, there is a hose fitting on the air box so you can run the breather from the engine directly to that fitting on the air box. I can't picture it but don't think this will help with your oil concern.

Without a picture of the center, it looks like an aluminum core with steel plate on front. Is so or even if not, you may be able to pry the magnets out, have the aluminium piece remade and epoxy the magnets back in place. You could take it to a shop that does machine work and ask. I found this also.

Can you post a picture of crack in part?

That sounds unique. Any pictures?

Maybe something along the lines of a Japanese flat track handlebar?

Clearance holes in the fins look a bit crude and not OEM so maybe a modification. However, it looks like there is a cast in boss where the plug threads in.

I have a TY250A with two spark plug holes. Did they come that way or could it be an aftermarket head? Online parts lists don't seem to show two but a drawing in the service manual looks to have two. I remember having a DT1 with a compression release but don't know if it was OEM or after market.

My 2008 had a magnesium side cover that was eaten away by corrosion in the water pump area. I believe the replacement part was aluminium.

I recently noticed a squeak at the rear wheel of a modern Triumph Tiger while lubing the chain. I could feel no drag and nothing had been changed. It turned out to be a dry seal on the outside of a wheel bearing. A little Teflon spray on the seal got rid of the squeak.