spurdy

First, is ditch the boost bottle. They can cause issues with air leaks and can cause intake boots to crack, again, resulting in an air leak. The bog at 3/4 throttle and above is s most likely a jetting issue on the main jet. Carbs? Pipes? Any changes in airflow through the motor will need to have jetting adjusted. From intake tract to exhaust, porting, etc. Sent from my iPhone using Tapatalk

I'm just gonna throw this out there for ya to think about.....if you don't have the money to do it right, put your money into suspension. It will be better spent then to do a motor "on the cheap". Sent from my iPhone using Tapatalk

Search! Lots of info here if you use the search function. But yes. You will have issues. Sent from my iPhone using Tapatalk

That's a bit of a job. Not hard, just a bit of work. If you tip the bike on its side, you can pull the clutch cover without draining the oil. Coolant still has to be drained. About at a 45 degree angle. But, if you have to pull the motor the cases need drained anyway, so your choice. Once the clutch cover is removed, you probably won't be able to see if the seal is damaged. But if it is, something typically caused the damage so you might find debris in the bottom. This would be a good sign that you are onto something. If not, you'll likely have to remove the clutch and maybe even the primary drive gear on the pto side of the crank. Unfortunately, to change the crank seals, the engine cases have to be split due to a rib in the middle of the seal. You can do this without messing with the top end, however, this might be a good time to go through everything, but I don't know your situation or your motor so that's your call. But you can just pull the bottom case half off and replace the seals. Supplies needed. Clutch cover gasket and yamabond or 1211 or similar petroleum impervious sealant plus new seals. Sent from my iPhone using Tapatalk

Check your coolant level. If it is coolant your level will obviously drop. You can also smell the difference between coolant and oil. Sent from my iPhone using Tapatalk

If it is steam, this could be the case. But smoke is oil. Sent from my iPhone using Tapatalk

^^^this. Oil is what makes it smoke. Since your fuel charge first goes into the crankcase before traveling through the transfers into the combustion chamber a worn out set of rings allowing blowby isn't going to make it smoke anymore than usual since your fuel charge in the crankcase has the same oil in it as the fuel charge sent through the transfers into the combustion chamber. THIS IS NOT A 4 STROKE. Oil leaking through a worn or damaged seal on the right side of the clutch cover will add oil to the right side of the crankcase and send it with the fuel charge to the combustion chamber, burning this excess oil with the fuel charge producing smoke. That's a logical cause as opposed to repeating something you've heard somebody else claim but have no way of explaining it. Sent from my iPhone using Tapatalk

Makes no sense. Failed rings cause low compression. Sent from my iPhone using Tapatalk

How is that going to make it smoke excessively? Sent from my iPhone using Tapatalk

Could be sucking in oil through the crank seal on the clutch side. Assuming that is what you mean by right side. Sent from my iPhone using Tapatalk

I get what you're saying. Unfortunately, that limits what is available to you by a shit ton. Sure, any competent engine builder can bore a set of cylinders, but only someone that specializes in 2 strokes or specifically Banshee motors is going to be able to get full potential out of your cylinders. We all have our opinions. I've got a builder just down the road (that some people love the hell out of) from me but I send my stuff to the west coast because that's where I get the best results. To each his own. Good luck, I'm ducking out of this thread. Sent from my iPhone using Tapatalk

Stock sleeves can run up to 66.50mm. But the structural integrity of the sleeve is weak at the bottom and you can have cooling issues. Most don't go larger than 66mm. 68mm is the size of the standard cub bore. Sent from my iPhone using Tapatalk

You're a dick and nobody likes you. Sent from my iPhone using Tapatalk

Didn't we just have a guy here that had stock slides in backwards and it wouldn't start? Sent from my iPhone using Tapatalk

Isn't that where the term askhole was coined from? Sent from my iPhone using Tapatalk

Sounds like you have an issue with the carbs. If it starts and runs by feeding fuel to it then there is an issue feeding it fuel automatically. Which is what your carbs do. If it was a reed issue, it wouldn't matter if it got fuel or not. Sent from my iPhone using Tapatalk

To run pump gas you're probably gonna need a 21-22cc dome. Most builders will be able to tell you what size you need based on port timings when they look at your cylinders. Sent from my iPhone using Tapatalk

That's the reason you don't drink a case a day? Sent from my iPhone using Tapatalk

What he said! ^^^ Anytime a vendor asks you to do something additional and you don't do it, they can claim you didn't follow directions whether said activity was needed or not. Sent from my iPhone using Tapatalk

Yes, and that clymers you are going to buy will tell you the clearance needed. I think it is 0.002" but don't quote me. Just FYI 1mm is 0.040". So, go with a sponsor, tell to set up your cyl as small as possible and they will tell you what can be done. They can supply pistons or you can order them. They can match them or you can get them and measure yourself. Not sure how close to splitting pennies we need to be. Sent from my iPhone using Tapatalk

Weisco doesn't make a 65.75mm last rebuild I did and I didn't want to go to 66mm, as I said before. That's why I had mine nicasilled at 65.5mm. As I also said before, don't overbore to go bigger. Overbore because that's what you need to do to fix gouges or true up your cylinder walls. Growing weary over here. Sent from my iPhone using Tapatalk

This^^^ Sent from my iPhone using Tapatalk

Like ginger said, Weisco goes to 66mm and even larger. Now I'm starting to question thoroughness. Sent from my iPhone using Tapatalk

No way to vouch for the work of your dads friend. We do know that the sponsors on here are good at what they do, which is Banshee stuff. Not that nobody else can do it but the chamfers have to be right so as to. Or snag a ring and two strokes are more particular than four strokes since your porting doesn't exist in the cylinder walls on a four stroke. Sent from my iPhone using Tapatalk

Other than the fact that there is a spacer plate. Lol! Sent from my iPhone using Tapatalk