Route 6x6 Discussion Board: Help with Max IV kawasaki 440

Route 6x6 Discussion Board Shop Talk: Tech Tips and Q&A section Help with Max IV kawasaki 440

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Andrew May
New member
Username: Nozzleman671

Post Number: 1
Registered: 03-2010

Rating: N/A
Votes: 0 (Vote!)

Posted on Thursday, March 25, 2010 - 09:42 pm:

I boutght a Max IV with a 440A Kawasaki motor with some kind of home made exhaust. The engine runs well until you put it in gear and then it bogs down. If I remove the K&N air filter it runs better but still not right. Anyone able to help Id appreciate it. Can anyone tell me where I can find an original exhaust or a exhaust that will work properly. Im lost Id love to ditch the 2 cycle but I cant afford a 4 cycle. Maybe id be better off finding a used rotax and dropping it in. Also does anyone know what plugs i should be using. It has NGK B8ES plugs now i thought about using hotter plugs.

Don Kinyon
Intermediate Member
Username: Oldnatva

Post Number: 89
Registered: 04-2002

Rating: N/A
Votes: 0 (Vote!)

Posted on Sunday, March 28, 2010 - 09:54 pm:

It sounds like it may be running rich. What carb is on it? Two-strokes are a blast but probably not as practical in a trail machine. The Kaw 440 is a good engine and no less trouble than a Rotax, so you may not be any further ahead going that route. I used B8ES in all the K440s that I've had and never had a problem. I'm not sure what's recommended, but the NGK won't foul as quick as most.