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Discussion Starter · #1 ·
I have 2 foreman 400s one 1997 and one 1999 and both of them are experiencing misses and bogging when you are really pushing it to climb a hill or swimming in the mud and snow. I have talked to a few dealers with little to no results. I ride anywhere from 5,000-10,000 feet in elevation. Any help would be greatly appreciated!! No mods have been done to either machine just the routine maint.
 

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I would look at the size of jets you are using. Check what the stock jets are and compare them to what elevation you are riding in. It sounds like 5 to 10 thousand feet is high for stock jets. Seems to me that stock jets are for 3 to 5 thousand feet.I am sure someone will confirm or correct me on this.
 

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there has been a few post on different factory jets sizes for the 400's, down south the 400's run a #130 and some of the bikes up north run a #125 for the higher elevations.
 

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Discussion Starter · #4 ·
Thanks for the assistance I will check the jetting on both bikes and see if I can find out which one is in them. Would the K&n power kit be something worth looking at? Also, Is there a spark plug that works best in these bikes?
 

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I have nothing against the K&N filters other than the price. I use the UNI filters on our bikes. They flow just as good for half the price and have always used the NGK plugs.
 

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Discussion Starter · #6 ·
OK I found that both bikes have 130 jets in them so now the big question is do I install 125 or 122.5 jets? the dealership really had no answer for me they just said 8-10% leaner is a good guess. So I purchased both jets so I may have to do the trial and error method starting with the 125 so I don't run it to lean with the 122.5. Any suggestions? I will have to price that uni filter Thank You!
 

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Discussion Starter · #10 ·
Well my foremans seem to be alot better. They have alot better throttle response now and don't seem to miss as much. I also purchased 122.5 jets so that when I am deer hunting above 9000 ft I can switch out and try them.
 

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Discussion Starter · #11 ·
Well I was finally able to really test the new jets that I put in they seem to have cured the missing under power although the 99 still seems to backfire alot when decellerating so much so that the baffle is blown out. But I do appreciate all the help that I recived for the missing issue!!!
 
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