jonnyo

Hi theflyingferret First of all sorry for any "bad english" words. I'm swedish. I've had all your problems with my last bike Beta REV-3 270cc 2000 and fixed them all during the time I owned the bike (3 years). A month ago I sold a perfect working Trial to a supersatisfied guy! 1. Pinking - Make sure that the engine can breathe properly the way it's supposed to do. My fixes for this (starting at the airfilter): ---------------------------------------------- - New airfilter (the last one had a little crack and was filling the airbox and carb with crap) - Remove "airbox" and make it superclean inside or you'll be cleaing the carb forever - Clean carb (again). If it's bad you might have to use ultrasound cleaning. I didn't but I stripped everything from my carb and bathed it in diesel for 24 hours then used compressed air to clean it. One of then channels in the carb had a blocking of one centimeter of carbage in it that came out. - Replace the reed cage in the intake. The tongues where not sealing a 100% in my case. One of the main reasons for pinking I think. - Doublecheck the rubberintakes for cracks and replace if necessary - Plug - NGK between 5 to 7. - Clean exhaust. - Make sure exhaust not leaking in joint between exhaust and silencer - Replace silencer padding (Beta original, not some isolation material from house construction) - Beta in sweden also gave me a tip changing the then main seals (and main bearings). When the engine gets really hot a old hardened seal will let air get in behind the flywheel. I changed these but can't be sure it made a difference. Note: ----- - It takes som running before the engine "get used to the changes" 2. Starting - The carb gets flooded My fixes for this: ------------------ - Every night make sure the fuel tap is closed (and that it closes a 100%) Start procedure that worked for me (Observe! Used only for the first start of the day) 1. Open fuel tap 2. Pull the choke up 3. Kick it 4. When it starts, rev the engine a litte then press down the choke. Let it warm a little. During a day I never shut off the fuel tap and choke. It just started in 1 - 2 kick's 3. Stalling downhill - Carb doesn't flood :-) I didn't have this exact problem but I sent my Mikuni carb to Beta in sweden and they drilled a new channel in my carb fixing it from flooding (known issue on Mikuni). I think that the angle of your carb and the adjustment of the valve stopping the fuel from coming into the carb is in "poor harmony". It is flooding when the fuel tap is on and the bike is in a normal angle (giving startproblem) and shutting off when you're going downhill. Hope I helped.... Jonny Olsson in Sweden (now riding Beta Evo 290cc 2011)

I have a BETA REV-3 270cc 2001 and have had the same problem for a while. Never have had any problems starting it during the day when I'm out riding. My solution was very simple: 1. Make sure you always turn off the fuel valve when parking for the day. 2. First start of the day: Fuel valve ON and I always use some choke (resetting it directly after it starts) My problem is gone :-)