Riding

CDI is probably not the issue, i would check for correct resistance at the main coil and also pickup coil, which is attached to the stator. Also check to make sure you have a good ground at the main coil and CDI . You can also check to see if the pickup coil is putting out voltage, i usually do it with an anologue meter with a needle seems to be more sensitive to small voltage spikes, you can see the needle move , you have to look close or you will miss it, very quick.

A new thread makes it easier to follow.... Does it backfire ? Is it out of the carb or the exhaust ? Are you certain it's the mid range that's causing it, or could it perhaps be that it's when the load starts coming onto the engine that it starts to misfire ? In which case it's more likely to be a coil or lead, cap or sparkplug. The way to check if it's throttle position, or engine load, is to go up and then down a slope/hill. Start a new thread though.. Otherwise it's too easy to confuse bikes or owners or problems..

Very cool. I've never heard of them.

Have you ever been on the trail and your tire valve goes bad. No way to break down the wheel and replace it. A lot of you probably know about this already i had heard of it but never used one. Just punch out the old one insert and tighten down the nut So far it has worked very well.

Same exact issues with 02 yamaha big bear. Replaced with new carb. Same issue, bogging down when throttled past mid range. Bought another new carb, replaced again. Same issue. Good gas, jets all correct, screens clean, fuel lines clean, good gas, new battery, new plug, filters etc…Not sure about the CDI, but how about replacing the stator?Thoughts?

Most machinery, whatever it is, always wears the same parts out, which is why it doesn't always work out so good keeping old machines for spares... I think I'd choose the best rolling chassis with reasonable suspension brakes etc, and swap motors, bodywork etc onto that one. Just a guess without knowing if things are worn or crashed or blown up, but based on having seen(and done) a bit of this work.

Hi and welcome along. That does sound like a fun project.

Welcome to the forum, always nice to hear about interesting projects! Good luck and we are here to help if needed.

Hi! I’m new to the forum. I have several Polaris Trailboss 500’s, which I’m trying to make 2 usable bikes from. One is all but complete, needing only reassembly, while the other two are a decision as to which is parts and which is bike. lol. Anyhow…

They are a must have if you have acreage, at least for me anyway, im getting older and dont like to walk so much anymore, would rathar ride.