godzilla Posted May 21, 2009 Report Share Posted May 21, 2009 I was going to get one of the Jitsie carb screw for my rev4, are they any good and are they easy to fit and Set up, will i need any special tools? Quote Link to comment Share on other sites More sharing options...
rlracer Posted May 21, 2009 Report Share Posted May 21, 2009 The Jitsie screw is an excellent addition to the 4-stroke beta. Best to pull the carb so you can see the stock screw, turn the stock screw in and count how far it is out and set the jitsie at the same turms out to start with. No special tools needed, just a few basic tools. Quote Link to comment Share on other sites More sharing options...
nzralphy Posted May 22, 2009 Report Share Posted May 22, 2009 Get one get one get one get one. Got it? Brilliant little bit of kit. what he said. Take the carb off to fit it as there is (in order they go into the hole) a very small o-ring, very small washer, then the spring. You will loose these so easily. Two turns out is nice and crisp but stalls easy. 4 turns out (Lampkins recommendation) difficult to stall but a bit fluffy at 1/8th throttle. 3ish turns out seams out best and it starts easy. FWIW..... also change the main jet to #112.5, raise the needle to the lowest clip position (and put the thicker of the two small needle washers under the clip for more lift), cut off the middle seat/guard support if it is still there to get air to flow to the carb. My bike is running really well with these settings. Fit an Iridium plug. Fit a proper kill button. Valves appear to be best set at 0.09-0.10mm inlet, and 0.125mm exhaust for nice quiet operating Quote Link to comment Share on other sites More sharing options...
godzilla Posted May 22, 2009 Author Report Share Posted May 22, 2009 Sweet ordered the bits today, not sure where this support stay is and less sure about cutting it out. the bike has always been looked after by lampkins so it may be gone alredy. i have only had the bike a month and am new to beta. (Ex scorpa) Quote Link to comment Share on other sites More sharing options...
nzralphy Posted May 22, 2009 Report Share Posted May 22, 2009 Rev3 2T had 5 exterior screws holding the mudguard on, plus one hidden inside at the front of the airfilter inspection cover. The 4T uses 2 fewer exterior screws. The hidden screw has a large tab of plastic going back up to the guard. The tab makes a really good wall for the air to flow around and it is stupid. Remove it and more air will flow to the air box. You'll also see a couple of vents in the guard that are blocked with black covers. Remove these and silicon the mesh in place for even more air flow. Quote Link to comment Share on other sites More sharing options...
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