twizted269 Posted June 9, 2008 Report Posted June 9, 2008 went up on the trails this weekend. spent about 6 hours on them running great. after hittin a few good ruts and shakin thingsup, it started to sputter in a way in the low range. power band is great but everything below that is weird. idles like one cylinder is firing half of the time. changed coil, checked connections, and stator. everything looks sound but still runs weird. runing fresh rebuild with crank. all stock with fmf pipes. ran great for the whole trip then crap. any ideas? Quote
okbeast Posted June 9, 2008 Report Posted June 9, 2008 What's your jetting? May have got some trash in a pilot jet.. Quote
twizted269 Posted June 9, 2008 Author Report Posted June 9, 2008 What's your jetting? May have got some trash in a pilot jet.. as far as i know i have stock jetting. i have never done anything with the carbs besides the tors removal. i blew them out pretty good but never tore into it.also i dont know what size jetting i should run if anyone would know that would be great. i have 30 over pistons and fmf gold series pipes. everything else is stock. Quote
okbeast Posted June 9, 2008 Report Posted June 9, 2008 Do you have the stock airbox setup? Even if you have taht you should ahve bumped up your main some due to the pipes. Quote
twizted269 Posted June 9, 2008 Author Report Posted June 9, 2008 Do you have the stock airbox setup? Even if you have taht you should ahve bumped up your main some due to the pipes. also have stock airbox. i noticed on the trail that one tube on the side of the carb came off so i put it back on. could something have made it in through that and pluged something? also hit a puddle pretty good just before it happend. thought maybe something got wet but everything is dry now. Quote
okbeast Posted June 9, 2008 Report Posted June 9, 2008 Is the little black tube (about the size of the fuel dump line) connected between the 2 carbs? I can't remember what it's real name is, but if it's not there you'll get some acting up in the low-mid range. That, or the slides are in backwards, or the parking brake crap is acting up, or the TORS. One of those 4 most likely LOL :biggrin: Quote
twizted269 Posted June 9, 2008 Author Report Posted June 9, 2008 Is the little black tube (about the size of the fuel dump line) connected between the 2 carbs? I can't remember what it's real name is, but if it's not there you'll get some acting up in the low-mid range. That, or the slides are in backwards, or the parking brake crap is acting up, or the TORS. One of those 4 most likely LOL :biggrin: center tube for the choke is hooked up, parking brake is removed and capped along with the tors. and the slides are in right. im thinking carbs or electrical. i dont see anywhere that sand or anything could have gotten into the carbs unless through the vent tube on the side. i changed the ignition coil and the voltage regulator with known to be working extras and checked the stator to make sure it was good. i will tear into the carbs and give them a good cleaning and see what happens from there. Quote
okbeast Posted June 9, 2008 Report Posted June 9, 2008 Ok you seem to have checked the basics. Now if you can explain 'sputter' a little better. Quote
cornfed396 Posted June 9, 2008 Report Posted June 9, 2008 hey try a set of new plugs, and tell us how the old ones look, Quote
twizted269 Posted June 9, 2008 Author Report Posted June 9, 2008 i tried new plugs as soon as it happend and the old ones looked dark brown to tan on both sides. (normal to what i have experienced in this machine) and the sputtering i guess to best explain is like one cylinder misses a spark once in a while. it runs at idle but from idle to mid range is like its not sparking at at evrery interval. miore like it skips every fifth spark or so. Quote
twizted269 Posted June 10, 2008 Author Report Posted June 10, 2008 just tore into carbs and cleaned everything. a little grit but nothing looks like it would do anything to performance. set to 1 and half out and seemed to run a little better. still a little weird. great in the top end but seems to idle different and mid range is the same. Quote
okbeast Posted June 10, 2008 Report Posted June 10, 2008 What's your pickup gap set at? Check to make sure your flywheel is good too. Have you tried to switch the plugs and see if it does it, or can you even tell which cylinder is misfiring? Quote
twizted269 Posted June 10, 2008 Author Report Posted June 10, 2008 What's your pickup gap set at? Check to make sure your flywheel is good too. Have you tried to switch the plugs and see if it does it, or can you even tell which cylinder is misfiring? checked stator and flywheel, everything is norm. checked all wiring and removed everything tors related. nothing there. left side is the problem. running better today but still funny. seems to run richer now. the ceramic of the plug was black. new plugs no help. thinkin about drilling and tapping an idle screw into my spare carbs and trying them out. also need to rejet but dont know what to use. i have 40 over pistons with boost bottle and fmf pipes. any help on that would be great. thinkin 280 for the main. the rest i dont know. Quote
twizted269 Posted June 10, 2008 Author Report Posted June 10, 2008 also what octane is the best to run? i have always run regular pump with no problems. could premium help out? Quote
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