Hi. I'm having the leaking carb trouble with my 2006 rev 3 and I'm thinking of upgrading to a dellorto carb. I was just wondering if anyone knows which type I will need. 

The del orto is not an upgrade.

My old Rev 3 had the Mikuni and it was not hte best carb.  I sold the bike for an Evo and looking back I would have replaced the Mikuni with the Keihin if doing a carb swap.  There are some cheap Chinese copies of the Keihin on ebay which might be worth a try if you are not looking to spend too much on an old bike.  The Keihin model is PWK28.  Jets will depend on the Rev engine size.  The ones on ebay are about 20-25 quid.  It cost me more than that to have the carb ultrasound cleaned on my TRS.

I've just replaced float, valve and clip with a new inline filter on an old Beta, all for £40, and its solved the problem.

Thanks for your replies fellas. I will have a look into a keihin but will try the Billy t mod first and go from there. I only found the leak the day after I bought the bike. 🤦‍♂️

I don't have a problem with any of them, but the PWK28 jetting specs for the TRS are easy to find online and will put you in the right ballpark for ordering parts.

Beta started using the Keihin in 2008. Beta also tried the del orto in 1995 and went back to the Mikuni.

16 hours ago, jonnybrass said:

Thanks for your replies fellas. I will have a look into a keihin but will try the Billy t mod first and go from there. I only found the leak the day after I bought the bike. 🤦‍♂️

My old Rev with the Mikuni was OK for a while but after a few weeks started to dump petrol out the overflow pipe some times.  We are lucky to have a mechanic a few doors away where I work and I dropped it in to them to strip and clean the carb and check the jets etc.  He found a nail in the float chamber, so presumably the previous owner had thought that would help (it didn't).  Once the carb had been set up properly it was OK.  The biggest problem with old trials bikes in my experience is the person that owned it before you bought it ☺️