couling

Thanks for the reply, no cat that I'm aware of, nothing in the manual about one or any restrictors, I'm assuming these would be in the exhaust, I'll take you advice about the front sprocket, that sounds like a good call.

I bit the bullet and purchased a new Montesa Repsol a few weeks ago, not been out on it yet due to the lock down but can't wait to get out there, I have been riding a Beta 250 Rev 3 2004 model for about 4 years, great bike but but fancied a 4 stroke ( Montesa), heard a lot of talk about reducing the front sprocket by one tooth, changing the exhaust system to make the engine breath better, not sure what that means or if the high price tag warrants my fairly low skills, also the air filter, on my Beta I used Putoline air filter cleaner and oil, can I use this on the Montesa. Also the dealer has inserted a note in the owners manual, first service due in one month or 600 miles at a cost of £120.00 not sure what you get for this but I can change the oil and filter and check / adjust the valve clearances and as these bike only come with 6 months warranty, is it worth it, your thoughts / advice would be greatly appreciated.