bonbon Posted April 16, 2007 Report Share Posted April 16, 2007 Ok I'm running a 300 main with all the mods in my sig, and I did the chop yesterday at about 50*F and about 8200ft. Here is what my plugs look like. Left side Right side I think its dead on or maybe a little lean yet, I'll probably go up to 310's before it warms up more then drop back down. I also did the chop about 1000 feet above where I'll normally be riding at, so its probably a little lean yet? What do you guys think? Quote Link to comment Share on other sites More sharing options...
dajogejr Posted April 16, 2007 Report Share Posted April 16, 2007 8200 feet...sheesh.... I'd say you're lean a main. I'd rather err on the slight side of caution. I'd say you are damn close though. put 310s in there, and if you see a tad darker ring, you'll be ok. Some might say leave it...I'd rather be a hair rich and safe than on the lean edge of performance.... Quote Link to comment Share on other sites More sharing options...
bonbon Posted April 16, 2007 Author Report Share Posted April 16, 2007 LOL 8200 feet, its low huh. I can't wait to go to my parents place at 1500 feet and feel like it's supercharged hehe. How many sizes should I likely increase when I go down to 1500 feet? 3? I just need a starting point so I don't go rodding around and blow the fugger up again. I thought it was a bit lean, I'll get some more jets today and do another chop. Probably won't be for a while though, supposed to be raining and snowing here for the next week and a half. Stupid spring storms...... Quote Link to comment Share on other sites More sharing options...
dajogejr Posted April 16, 2007 Report Share Posted April 16, 2007 Dude, I'm in MI...no need to explain strange weather. In the end of March, we had an 80 degree day, it was a Tuesday or Wednesday. That following weekend, we got a inch of snow. It just don't make sense. Can't tell you for sure on the jetting, I can give you the rule of thumb I use. (Keeping in mind, I've always lived and rode in MI.... Less than 1000 feet.) 1 main jet richer for every 1000 to 1500 feet you come down in elevation. 1 main jet richer for every 20 to 25 degree drop in Temp (Fahrenheit) And vice versa, of course. You're already doing plug chops, so...you're ahead of the game, good for you. As long as you're doing them correctly (WOT run through 5 and 6 if possible, old plugs to warm it up, new plugs for the WOT run, old plugs back in to get to camp/truck/etc.) Than you're in great shape... Quote Link to comment Share on other sites More sharing options...
bonbon Posted April 16, 2007 Author Report Share Posted April 16, 2007 It sounds like I am doing the chops correctly. I've been reading a lot of the topics on hear and learned a hell of a lot about jetting. I'd never had to deal with it much before as this is my first 2-stroke but I love it. I don't mind wrenchin on them either, gives me some satisfaction knowing it runs right because I did it right. And if it breaks I can't be mad at anyone lol. I'll get some big jets then for 1500 feet and I'll just do a chop while I am there, at least I'll have a vise to hold the plug, all I had was a damned vise grip, PITA. I got sunburnt a few weeks ago out at KP riding with BigRed, then that next week we got a foot of snow. Oh well, we got all summer yet, can't complain about being able to ride in nice weather this early in Wyoming. Thanks for the info! Quote Link to comment Share on other sites More sharing options...
dajogejr Posted April 16, 2007 Report Share Posted April 16, 2007 That same setup here in MI, (again, less than 1000 feet) people usually end up with 320 to 350 main jets. But you have porting...so, no way to know for sure. I know that kinda pushes the envelope for my 1500 foot jetting rule...but, main jets are a few bucks, top ends are a few hundred...and cranks...well, you already know that.... Have fun!! Quote Link to comment Share on other sites More sharing options...
bonbon Posted April 16, 2007 Author Report Share Posted April 16, 2007 Actually no porting that I know of......I just had the topend all apart and rebuilt it and the porting is all stock. And I'm starting to get a collection of jets already just in case, I've got 270's up to 340's. And yeah they're only 2.60 or so a peice from the ol stealership here. Quote Link to comment Share on other sites More sharing options...
Animalman294 Posted April 16, 2007 Report Share Posted April 16, 2007 Yeah, It's great when you get everything dialed in............... Mines almost back together and getting close to firing it up............ Quote Link to comment Share on other sites More sharing options...
Michael Jackson Posted April 17, 2007 Report Share Posted April 17, 2007 i run t5's and vf3's, im at 0-1000 ft and run 300 mains, i have an airbox though Quote Link to comment Share on other sites More sharing options...
peak-j Posted April 17, 2007 Report Share Posted April 17, 2007 Look at my sig. , I am at 1000ft, and I am currently running 280 mains, tried 300's and killed my top end, currently running on 5th slot on needle. It is a little rich but it's not too bad. I haven't fouled any plugs with it, I rode at LS Oklahoma for 4 days, never had any trouble. My plug chop was a little bit darker than that. Quote Link to comment Share on other sites More sharing options...
bonbon Posted April 17, 2007 Author Report Share Posted April 17, 2007 I am baffled as to why I need such large mains at my altitude but the plugs don't lie....... It may have been colder than that too when I did the chop, weather.com said 50, but it was probably wrong. Maybe I'll try cleanin my carbs again and make damn sure all the sand is out of them, maybe they are still plugged a little and running lean. As long as the chop says I'm good though I won't deny it. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted April 17, 2007 Report Share Posted April 17, 2007 I am baffled as to why I need such large mains at my altitude but the plugs don't lie.......It may have been colder than that too when I did the chop, weather.com said 50, but it was probably wrong. Maybe I'll try cleanin my carbs again and make damn sure all the sand is out of them, maybe they are still plugged a little and running lean. As long as the chop says I'm good though I won't deny it. Keep in mind, the jetting advised is only an estimate. Although my colleague ojcool would dispute this, plugs really don't lie if you're doing the chop correctly. Rider weight, humidity, etc. all play a piece in the jetting scheme of things. And every motor is different. I try to jet a size or two rich to be safe.... The 1 or 2 HP that MAY be gained by being on the bleeding edge of lean isn't worth the costs to me. Quote Link to comment Share on other sites More sharing options...
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