jcshee Posted March 10, 2014 Report Share Posted March 10, 2014 (edited) hey guys I have a 04 shee it is a 4 mil short rod v force4 reeds stock head and carbs fmf pipes. the problem I am having is the right cylinder is burning great the left is wet and fouling out compression test is the same about 125 cylinder leak down holds a 5 psi for 30 min carbs are jetted the same any sugestions Edited March 10, 2014 by jcshee Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted March 10, 2014 Report Share Posted March 10, 2014 Check the coil? The boots? Same plugs? If the plugs have the shitty screw on caps are they tight? Quote Link to comment Share on other sites More sharing options...
sstaton1983 Posted March 10, 2014 Report Share Posted March 10, 2014 how does it run? Is it running on both cylinders? check your spark,It could be the cap in the spark plug boot, or a coil going south. Im guessing you have checked your main jet?? check your slide and needle, I had a needle causing a rich condition, it had worn grooves down the side. Quote Link to comment Share on other sites More sharing options...
jcshee Posted March 10, 2014 Author Report Share Posted March 10, 2014 the jets are both new on the mains and the needles are new as well. plugs are tight and it is still running the stock coil so the plugs have the screw on the top of them. it seems to run ok down low and in mid but when it gets the rpm up and you are in it hard it is like it hits a brick wall and just doesn't pull. both cylinders are firing good at idle and the right side seems to have a little more pop to the exhaust at idle then the left. I am thinking coil/wires as well Quote Link to comment Share on other sites More sharing options...
jcshee Posted March 10, 2014 Author Report Share Posted March 10, 2014 o and it is running vp110 fuel mixed 40:1 Quote Link to comment Share on other sites More sharing options...
topfuel! Posted March 10, 2014 Report Share Posted March 10, 2014 Not enough compression to burn 110, 125 psi is way too low to burn race fuel. Drain the tank, put some 92 premium pump in it and I bet you your problem goes right away. Quote Link to comment Share on other sites More sharing options...
jcshee Posted March 10, 2014 Author Report Share Posted March 10, 2014 ok I am at about 3200 ft elevation and it will be ridden most in the summer so around 75-95 deg. and dry. it has a 300 main and a 25 pilot you think the jetting will need to go up with the 91 oct. Quote Link to comment Share on other sites More sharing options...
topfuel! Posted March 10, 2014 Report Share Posted March 10, 2014 That's tough to say but 300 to 340 sounds about right on the main, I would go up to 30 on the pilot and dial the air screws in from there. But I knowa at 125psi your not making enough cylinder pressure to get a complete burn on race fuel. Switch your fuel and go from there. It's going to run alot better on the correct fuel. Quote Link to comment Share on other sites More sharing options...
jcshee Posted March 10, 2014 Author Report Share Posted March 10, 2014 OK and what is you guys opinion on the stock air box Y it really seams to favor the right cylinder as far as air flow goes when you look through the inlet from the air box you can see the right side straight through but not much of the left Quote Link to comment Share on other sites More sharing options...
topfuel! Posted March 10, 2014 Report Share Posted March 10, 2014 No idea man, never ran an airbox on a banshee and never will. Quote Link to comment Share on other sites More sharing options...
wayne_smith97 Posted March 11, 2014 Report Share Posted March 11, 2014 No idea man, never ran an airbox on a banshee and never will. I had an airbox on my banshee. I changed to pods rejetted accordingly and I did notice a difference. A good difference Quote Link to comment Share on other sites More sharing options...
uman1030 Posted March 11, 2014 Report Share Posted March 11, 2014 Have you tried swapping the wires? to see if the issue changes sides? What type of pipes are you running? are you sure they are free from obstructions and good silencer packing. Running super rich can cause them to get oil filled and block exhaust flow. Did you change to the proper fuel octane, premium pump gas? Higher octane fuel requires more compression and timing to ignite properly. Using too high of an octane results in more unburnt fuel (see the above statement about your muffler packing) are you running the airbox with the lid on? if so your jetting may be a little fat for that amount of airflow dependent on your temperature and altitude. Higher altitudes require smaller jets at 3200 ASL you would need smaller jets then a similar engine at a lower altitude, As stated above your lean on the pilot. Vf4's especially need a larger pilot jet. your altitude may not require the usual 30 but possible a 27.5 Just for reference, what is your needle clip set at? Quote Link to comment Share on other sites More sharing options...
Young Guns Racing Posted March 12, 2014 Report Share Posted March 12, 2014 ^ ^ ^ ^ This. Spot on. Quote Link to comment Share on other sites More sharing options...
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