650sx bog? help please

[surfside650]

i have a 91 650sx that bogs alot and the plugs are still good and by the end of the day it keeps getting worse like i cant even get onto a plane holding the throttle full open but after like 5 mins a putting around going 10mph it will go and going high speed it seems ok but not too good like not full power any ideas? i think it has something to do with the high and low adjustments on the mikuni 44mm carb not sure tho. last weekend i was messin with the low speed but didnt seem to make a difference

[Wakerider26]

I have a 89 650sx with a 46mm Mikuni and it does the exact same thing. Not trying to steal your post, I just hope somebody knows what the problem is.

[phoenixcustoms]

Hey Peter check this out.......I could have tried to tell you but I figured I would let this website do the talking.......I know that some of the stuff on there is not in your case but other parts of it are...

http://www.groupk.com/sep.htm

Trust Me Read the whole thing....I know its long but this type of thing we were talking about the other day happens to a lot of 2 strokes....It happened to all of mine....

[phoenixcustoms]

Now I am not saying you need this part but I do remember running an air seperator on all mine....But it came with my carb, and jet kit.....

[Schwarzenegger]

Can you post pics of the plugs? While out running it, once it starts acting up hold it wide open and kill the engine. Get it to shore and pull the plugs and take a few pics. It will help a lot with determining the cause or a good starting point. But it does sound like the carb needs to be pulled and allowed to soak for 20 minutes or so in some real carb cleaner such as Hydroseal. Adjusting the low speed won't help because it's a high speed issue. The low will only change how it idles, rough and wanting to stall...or lean and hanging on high idle when you touch the throttle.