Kawasaki 340 invader

[garson]

New to this forum and site but was told its a great sire and is very helpful. Just bought a 340 and supposedly the carbs were rebuilt. Sled is in great shape so I think the guy was telling the truth. Sled start alright. Idles fine but when u give it full throtal it bogs till the Roma get up into the ower band and is fine and if u keep it reved around 6000 and the punch it its fine. Just wondering why it Boggs off the line. Any help is greatly appreciated.

[Interceptor398]

Welcome to the site!  Your issue could be many different things.  Before you start taking things apart make sure you have fresh no ethonal gas and new spark plugs.  Try to burn some fresh gas thru it with a little Sea Foam added to the fresh gas.  If you can, do a compression test and a leak down test.  The seals in the motor are now at least 30 years old but Jimvw will fill you in on that.

[jimvw57]

First thing to do on any newly acquired sled is to do a compression check. That will tell you if the pistons and rings and cylinders are in good shape. The main thing you want is that the reading on both cylinders are the same (within about 10%) and are above 110 PSI. you want to block the throttle wide open, remove both plugs, and keep getting a reading until it quits increasing, about 3 -5 pulls. Once you have that and it is reasonable, then start looking at crank seals... let me rephrase that... just replace them!!   number one killer of Kawasaki motors is melted pistons from leaking crank seals!!

Won't solve your bog but it will make your sled last longer and it can be a long walk back t the trailer with a melted motor.

As for your bog, make sure the idle is set to 3,000 rpm, new belt, and clean out the primary clutch with some brake cleaner, NO OIL!! they are supposed to be dry inside. next, check to see that the carbs are pulling at the same time. They should both open at the same time, and have the same vacuum on each side. after all the adjustments, double check the oil injection cable adjustment. Make sure it opens at the same time as the carbs.

That should get you started. There are plenty of other things to check / adjust. we are here to help. the 340 sled is still one of my favorites as they take off much quicker and are just plain fun!!