Yesterday I pulled the carbs completely apart and cleaned them thoroughly. It seems to be running lean and only idles on 1 cylinder until you hit the throttle and then the right bank fires up. I've been having a hard time getting my bike running right. You cannot get a stable air-flow from the K&N type and thus will make it difficult to tune your bike.Ok so I had a topic going in General Maintenance but I figure this is getting kind of involved so I moved it here. I would also recommend using UNI foam filters instead of the corrugated K&N type. Its the jetting that makes them unique to a bike. And the BS34 carbs were used on many models over many years. He said the reason you have to make such a dramatic jump in size is because the BS34 CV's were very restrictive on suction and flow.ĭoes that sound about right?You cannot drill them out. The guy that posted that i guess owns like 3 '82 Suzuki GS450's and recommended that if you want pods and a high flow exhaust to jump those up to 40 on the pilot and 140 on the mains. Looks like the stock factory jetting is 17.5 pilot and 115 main.
I think i actually found the size of my carbs without having to tear them down yet. I have always just bought pre-jetted carbs for my Dirt Bikes to fit what i was running.Īlso. Is that right or was he just blowing smoke out his ass? It just sounded somewhat probable to me, but im new to the tuning carbs world. I was searching around and found a guy who said he just drilled the old jets to the size he needed. That's why these numbers are so drastically apart, from the standard rule of thumb of up two sizes.the head porting never changed between models.īut those are my suggestions, based on what you want out of it.a performance oriented speed demon that brings MPG down to about 45 or still fast but easier on the wallet in regards to MPG.Īnd i know its a long shot but can Jets be drilled to the right size needed? Typically any bike platform that was ported to another model using the same carbs companies just increased those jet sizes, so going by the larger platforms stock jets numbers then finding the best numbers for unrestricted can yield the best jets over all for the motor. But the porting and flow characteristics in the head design can change that rule of thumb drastically which in this case it does.mainly because it was later ported to the 500 model. usually up two sizes on the main is a rule of thumb when going to pods/pipes/and emission deletes to run well. This of course takes into account of removing the epa crap etc.
If you don't care so much about fuel economy but lean towards more performance then a 50 pilot and 145 main. Research into this model's head design and into a few boards bring good pod jetting brings it to a 40 pilot and 137.5 main.for best performance and fuel economy. The type of jets needed for this carb are pilot Mikuni VM22, and main is a Mikuni Small round.
UPGRADES FROM MIKUNI BS34 CARBURETOR CRACKED
I'm not sure what it has in it now 's a lot of years is a long time for a bikes carbs to go without being cracked and changed at some point, stock jets may be in it but may not be. Simply because the same carbs were used on different bikes, and they were jetted to match the needs of that particular engine.įor your bike model that carb had factory jet settings of 17.5 pilot and 115 main. Going by the carb number seems logical to find the jet sizes but you have to go by bike model.
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