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Tuning

 
 
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  #1  
Old 02-28-2010
gileskadensienna
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Default Bogg

hey all i have a 1991 indy 500, i have a bog out of the hole. how do i get rid of it, what can i try. the sled wotks real well once out of hole. it is clutched front and rear. top speed about 94 mph. 660 feet about 85-86. bog out of hole does not hurt me racing, everyone else seems to spin out and i ease out then the power hits. have beat a few 600 s with this sled. all stock but none the less everyone laughs when i ask to race tehn i beat them. have not played with carbs yet. what about air box what can i do there.
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  #2  
Old 03-01-2010
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DirtylilWolfess
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Play with your carbs first. They either need a good cleaning (very likely), or rebuilding.

I am not a sled expert - but one will be along shortly to give you some more specifics.

How long has this been going on? Is it rich bog or lean bog? When was the last time you cleaned things up? What on earth do you mean by clutched "front and rear?"
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  #3  
Old 03-01-2010
westman995
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He prolly meant primary and secondary clutch when he said front and rear.
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  #4  
Old 03-01-2010
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I had an Indy 400 which is basically the same engine and I had a lot of trouble getting rid of that bog. Some say it's inherent to that engine, but I think maybe it's something that's just difficult to get rid of with roundslide carbs. Turn the airscrews (the little brass flathead screws on the side of the carbs) in a 1/2 turn at a time. If it seems to be getting better, keep going 1/2 turn at a time until it's good. If it gets worse, go the other way. If you get those screws all the way in, and it has improved, but it's not gone, you'll have to get the next bigger sized pilot jet and then recalibrate those screws. Before you do any of that, making sure those carbs are spotless is your first priority.

One other thing I considered doing while I still had that sled was adding a product called UFO's. Those things are supposed to make the roundslide carbs perform as well as the flatslide rack carbs. Flatslide carbs kick roundslide's ass, so if the hype about the UFOs is true, they should be the cat's meow.
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  #5  
Old 03-01-2010
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Quote:
Originally Posted by Rubi View Post
I had an Indy 400 which is basically the same engine and I had a lot of trouble getting rid of that bog. Some say it's inherent to that engine, but I think maybe it's something that's just difficult to get rid of with roundslide carbs. Turn the airscrews (the little brass flathead screws on the side of the carbs) in a 1/2 turn at a time. If it seems to be getting better, keep going 1/2 turn at a time until it's good. If it gets worse, go the other way. If you get those screws all the way in, and it has improved, but it's not gone, you'll have to get the next bigger sized pilot jet and then recalibrate those screws. Before you do any of that, making sure those carbs are spotless is your first priority.

One other thing I considered doing while I still had that sled was adding a product called UFO's. Those things are supposed to make the roundslide carbs perform as well as the flatslide rack carbs. Flatslide carbs kick roundslide's ass, so if the hype about the UFOs is true, they should be the cat's meow.
where do you find them?
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  #6  
Old 03-01-2010
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Dennis Kirk, shade tree, other snowmobile shops/vendors
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  #7  
Old 03-02-2010
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First off, the UFO's are a waste of money, I had a set and they did nothing noticeable to the sled.
There can be a few factors working against you here.
1. Clean the carbs

SHIT FIRE CALL< I"LL FINISH THIS POST WHEN I GET BACK
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  #8  
Old 09-19-2010
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I had a a cat 440 doing the same thing. cleaned the carbs adjusted them many times over. found out at the end of the year one of the choke plungers was sticking open and causing it to bog off the start and then it would scream the rest of the way.
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  #9  
Old 09-20-2010
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if this was my sled, i would drop the pilots out and hold them up to a light, make sure they are clean, if they are clean then drop one size and see if the bog gets better or worse.
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  #10  
Old 09-20-2010
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clean carbs

clean clutch/weights
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