Exciter bogs when warm

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kenziesupra

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Joined
Dec 11, 2012
Messages
65
Location
Wisconsin
Hello, I've been working on my brothers 1990 exciter 570 that has an aaen pipe and 330 jets. it runs fine when cold but when it warms up, it will bog. it only bogs in mid throttle, when i let off the gas then go again (like going around a corner). i can pinch the throttle from a stop and it will get through the bogging range easily but once i let off then give it gas (after its warmed) it will bog down. Ive gone through the carburetors and cleaned them, ive changed the secondary spring position from A2 to B2 (cleaned & greased it as well) and it seemed to run a little better but once it warms up again, it will bog. The belt deflection seems OK, if I lift the back while it's running, the track will creep. the plugs are light brown with silver crown at the tip of the electrode. ive been messing around with it for awhile now. ANY help at all would VERY greatly appreciated. Thankx :dunno: :dunno:
 

From the description of your plug, it sounds a little lean, maybe. What part of wisconsin have you been riding in? Im north west of milwaukee and it has been 35-45 degrees during the day since we got our last snowfall last friday. Try turning off the valve that supplies coolant to the carbs. Could be why you are bogging. I had a similar problem running psi twins. The temps got above 30 then it would constantly load up. Where do you have the clip on the needles?? Should be in the center.
 
its been running like this all winter. even in the cold. thank you. The coolant would probably be something to check for leaks. i live 30 miles northeast of madison. and yes, the clip is in the 3rd (middle) position. appreciate the quick respond
 
Could be the bushings on the weights or the rollers are wore. As far as I understand it, when the rollers get worn out, it will feel like you have too much weight in the clutch causing the primary to shift too quickly.
 
Double check your choke cable adjustment. If you are running partial choke it will run poorly once warm.
 
Good call meat. That could definately do it. I just realized I had a similar problem on my arctic cat ext. Your problem sounds worse than mine tho Kenzie.
I was having an issue where idle and wot was fine but it seemed like I was a bit rich in the mid. It got really bad one day riding so I was going to change the plugs. As soon as I took off the plug caps I knew what my problem was. I could tell the cap was arcing to the terminal. I cleaned it up and it ran ok for a couple of weeks and then it happened again.I went to the local Kawasaki/ sno-jet dealer (yes there is one still around) and got some new plug caps. WOW!!! did that make a hell of a difference. It pulls like crazy all the way up now.
Like I said, my sled seemed to run good except it had a flat spot in the mid and thought that maybe it was one of this particular motor's quirks. Untill it got real bad. Maybe check and see if you have carbon on the plug connection like I did. Worth a shot anyway.
 
thankx meat. That is a good idea, the choke on it broke so we lift the cable itself to start it but then we put it back down in the choke chamber and we think nothing of it. I will check that tonight and update. thankx
 
well, i fixed the choke cables and it's still acting funny. I kind of feels like (when i pull out of a corner) it's not getting enough rpms and is trying to pull off in a higher gear.
 
Man, That sounds like a secondary issue. Do you know what the gearing in your chain case is. What degree helix are you running?? What color spring in the secondary?? What max rpm are you running at wot??
 
I cant believe I didnt see it the first time. If your track is creaping you have a clutching issue. Do you have the correct belt? If not start there. That creap means that the belt is not coming back up high enough on the secondary, essentially putting you in a taller clutch position than it should be. I would also take a look at that secondary and the position you put it back together in. Those two things are where I would go next.
 
This sled is famous for a bog when warm..you said its ok when cold right.
There is to mutch heat under the hood and the airbox sucks the heat right into the moter.

I closed the origanal sguare opening up with some plastic and made a new hole on top of the airbox with some foam to keep the snow out.It helps but there is just not enouth air openings on the 90 hoods to keep it cool on warmer days.



.
 
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Throttle Junkie35 said:
Man, That sounds like a secondary issue. Do you know what the gearing in your chain case is. What degree helix are you running?? What color spring in the secondary?? What max rpm are you running at wot??
Click to expand...

I think the chain case is stock, The helix is a 45, the secondary spring is black with white stripe, and I'm not sure what the RPMs top out as because the tach doesn't work.
 
kenziesupra said:
I think the chain case is stock, The helix is a 45, the secondary spring is black with white stripe, and I'm not sure what the RPMs top out as because the tach doesn't work.
Click to expand...
Meat could be correct also. If you have a ''creep'' at idle your center to center clutch distance could be too long. Do you know if you are running the correct belt for sure??
 
Throttle Junkie35 said:
Meat could be correct also. If you have a ''creep'' at idle your center to center clutch distance could be too long. Do you know if you are running the correct belt for sure??
Click to expand...

no i am not sure, do you know how i could find out if it is the right belt? the guy before me made 2 exciters into one. an 88 or 89 nd a 90.
 
Maybe put up some pics of the clutch set up you have. Is it a stock yamaha clutch?? If so ypz or yxr? Or a comet? Stock belt should be an 89X-17641-01-00. If you have a comet 108 or a yami yxr your belt should be an 89L-17641-01-00. It think an 8DN belt is the same as the 89L but dont quote me.
 
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