Thanks for the link Matt, great reading there from a guy that know his stuff.
 
 

Yeah Jason is a nice guy and a wealth of knowledge.
 
Cheers
 
Matt 

Does anyone one know what they are like on economy? Better or worse than side draughts?

Much better from my experience
 
Matt

If your getting backfiring through the carbs, you`re looking at valve timing.

Not necessarily, my experience has been that poorly tuned (not balanced) carbs will promote "spitting" more so than cam / valve timing.  
 
Like any carbs, if yo get them set up properly on a dyno they will work great but if you just bench "tune them" they will never be 100%
 
Cheers

Matt 

hi, i use the R1 setup on my oldtimer with 1600 engine. when i driving about 130 km/h for a little while my AFR gauge goes to max value (19). close the throttle for a little while and it goes back to normal. Seems that my carbs get little fuel and they are sucked dry. I use a universal 0,3 bar pump, does somebody know how much fuel the pump should give (ltr/hr) or what the original R1 pump gives ?
 
thanks !

The original pump is around 2 - 3psi from memory but will flow more or less as demanded by engine. A bike fuel pump is def the way to go