jonvia Posted March 30, 2011 Report Share Posted March 30, 2011 im getting v-force 3's will i have to re-jet my carbs after i install these? i dont know how to do jetting so i hope not haha Quote Link to comment Share on other sites More sharing options...
robert.b.west Posted March 30, 2011 Report Share Posted March 30, 2011 If you don't know how to jet your quad you better learn. All performance mods (except maybe timing and compression) require jetting adjustment. AND it is a good idea to check your jetting on any mod that you do. Quote Link to comment Share on other sites More sharing options...
jonvia Posted March 30, 2011 Author Report Share Posted March 30, 2011 If you don't know how to jet your quad you better learn. All performance mods (except maybe timing and compression) require jetting adjustment. AND it is a good idea to check your jetting on any mod that you do. help me with jetting haha. i read the pinned thread about it, but i dont understnad which jets are for what. idk lol Quote Link to comment Share on other sites More sharing options...
Boston Posted March 30, 2011 Report Share Posted March 30, 2011 1/4 throttle is for that small pilot get 1/4-3/4 is for your need jet which is the needle thats in the slide and 3/4-full is for your main jet. so say your riding around and its running good except for full throttle well depending on it its lean or rich youd mess with your main jet. so on and so forth for all the other jets. Quote Link to comment Share on other sites More sharing options...
Boston Posted March 30, 2011 Report Share Posted March 30, 2011 oh and you shouldnt have to jet for vf3's it will just help with throttle response. anytime you increase how much air/fuel that is getting into your motor is when you got to rejet. so say you port it, pipes, filters, those are time youd have to bump your jets up. Quote Link to comment Share on other sites More sharing options...
jonvia Posted March 30, 2011 Author Report Share Posted March 30, 2011 oh and you shouldnt have to jet for vf3's it will just help with throttle response. anytime you increase how much air/fuel that is getting into your motor is when you got to rejet. so say you port it, pipes, filters, those are time youd have to bump your jets up. okay that actually makes more sense what you said above thanks! Quote Link to comment Share on other sites More sharing options...
jonvia Posted March 30, 2011 Author Report Share Posted March 30, 2011 1/4 throttle is for that small pilot get 1/4-3/4 is for your need jet which is the needle thats in the slide and 3/4-full is for your main jet. so say your riding around and its running good except for full throttle well depending on it its lean or rich youd mess with your main jet. so on and so forth for all the other jets. so say my plugs are black and wet, and its backfiring in one cylinder, would that be the jetting? or plugs? or fuel mixture? haha Quote Link to comment Share on other sites More sharing options...
robert.b.west Posted March 30, 2011 Report Share Posted March 30, 2011 Backfiring tells me that you have a very lean condition. If it is only happening on one side probably means that you have an air leak. Meaning your carb boots are not tight or a gasket is bad or reed bolts are not tight or something like that. When does it backfire? please be more specific. I would personally do a leak down test just to be safe. There is a thread that shows how to do this. It is very easy. Just because your plugs are black does not tell you anything. You dont know if it is rich on only the pilot circuit causing the plugs to be black when you could have a lean main. You have your three throttle position that you need to diagnose as stated above. You can check your main by doing a plug chop. There is a thread that explains this but basically you warm up your bike on old plugs. Once it is warm shut it down put in new plugs and run wide open throttle 1-6, pull in the clutch and kill the motor. Now take the new spark plugs out and ride back on the old plugs. Cut the threads off the sparkplug using a hack saw or cutoff wheel. at the base of the porcelain there should be a brown ring about 2mm in height. If it is more it is rich if it is less it is lean on the mains. As for the mid throttle position it is basically feel. For your pilot/idle circuit there is a thread explaining how to adjust your pilot jet and fuel air screw. Quote Link to comment Share on other sites More sharing options...
jonvia Posted March 30, 2011 Author Report Share Posted March 30, 2011 Backfiring tells me that you have a very lean condition. If it is only happening on one side probably means that you have an air leak. Meaning your carb boots are not tight or a gasket is bad or reed bolts are not tight or something like that. When does it backfire? please be more specific. I would personally do a leak down test just to be safe. There is a thread that shows how to do this. It is very easy. Just because your plugs are black does not tell you anything. You dont know if it is rich on only the pilot circuit causing the plugs to be black when you could have a lean main. You have your three throttle position that you need to diagnose as stated above. You can check your main by doing a plug chop. There is a thread that explains this but basically you warm up your bike on old plugs. Once it is warm shut it down put in new plugs and run wide open throttle 1-6, pull in the clutch and kill the motor. Now take the new spark plugs out and ride back on the old plugs. Cut the threads off the sparkplug using a hack saw or cutoff wheel. at the base of the porcelain there should be a brown ring about 2mm in height. If it is more it is rich if it is less it is lean on the mains. As for the mid throttle position it is basically feel. For your pilot/idle circuit there is a thread explaining how to adjust your pilot jet and fuel air screw. well, when i start it it usually starts on first kick. when i rev it up it backfires a little in one clyinder.also when first riding it it bogs.but i guess thats normal because its cold start. the other cylinder runs good.ive already synced my carbs. send me a link to the leakdown test please, lol. cause thats probably it.when it warms up it does pretty good though. idk its a brand new engine couldnt be the compression. mabey my fuel mixture? Quote Link to comment Share on other sites More sharing options...
robert.b.west Posted March 30, 2011 Report Share Posted March 30, 2011 Go to the banshee repairs and mods section. It is the first thread. It is a sticky so it does not ever move. Quote Link to comment Share on other sites More sharing options...
jonvia Posted March 30, 2011 Author Report Share Posted March 30, 2011 Go to the banshee repairs and mods section. It is the first thread. It is a sticky so it does not ever move. thanks man! Quote Link to comment Share on other sites More sharing options...
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