Engine running rough...

nate007

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Location
Iowa City, Iowa
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Snowmobile
1. '06 Apex -twin screw
2. '04 Redline Revolt 800
3. '09 Nytro XTX - twin screw
A couple things:
1.I went out last night with one of the guys who works for me, and noticed a few things I thought were a little weird. After riding our local lake at about 50-60mph (I know, but it was dark!) we pulled off to figure out where we wanted to go, and I noticed my sled was idiling rough. Not too bad, just enough to notice. Throttle response was fine, and I didn't notice anything else wrong. I do have the CR10's, and airbox mod, and +10 on the ECU. It hasn't done this before, but I am wondering how much the outside temp has to do with it? It was about -10f. It also has quite a mean idle when cold, but I'm sure the Bender pipes help that a little...

2. I could be smoking something here, but....
I have the Bender clutch kit on my Apex, and I've noticed that I have to ride a few miles normally before I can really honk on it, or it hits the rev limiter. Last night, it would hit the rev limiter everytime I nailed it. Just a fluke, or do I have a belt/clutch issue? 9 times out of 10 , it will run to 10900 or 11000, and then shift back to about 10500.
I ahve about 800 miles on the original belt, and I would have to say I don't ride overly agressive.....

3. I had the unfortunate experience of having to tow a dead POO last night as well. The chump that went with me had his chaincase blow out on his '95 Indy 650. We removed his drivebelt, but that thing was still quite a turd to pull. We only had to go about 1/4 to 1/2 mile, but it was crappy trails through town. After wards, I rode about 15 miles to get home, and all was fine. Should I consider replacing my belt, or is there any stress issues to watch for when doing towing?

Definately not the most fun I've had snowmobiling...

Nate
:o|
 
1. Not sure about this one. Maybe it was the cold temps.

2. It takes a little bit for your engine and clutches to build heat. A cold engine and cold clutches will always turn more rpm's. Make sure your doing your tuning with a warmed up engine and clutch, since that is how you ride it most of the time.

3. Unless you were really burning the belt, I wouldn't really worry about it, towing that sled ins't putting much more or any more stress on the belt than you running 100 across a lake.
 
I don't think I did anything to the belt, since it drove just fine afterwards, and tomorow will probably be our last ride here since it's supposed to be into the 40's next week.

Does anybody think that you could have problems getting the belt and clutches up to temp on a really cold night? I wasn't riding very hard and our trails were very rough, so we were going pretty slow.

I'm riding the daylights out of it tomorrow (last hoorah???) so I'll see how it goes...
Nate
 
I don't mean to sound like a recording but try some fuel injection cleaner. A couple dollars for a bottle and it treats two tanks. Small one litre motor with 4 small injectors. I know my bike would run better after I started using it. Have used it on the sled from the beginning to just keep them clean.
 
Nah, since I don't need fuel very often with the miles I ride, I get it at the same BP station that I use for my construction company. The trail goes through the front yard of the station, and most sleds in the area get gas there. OUr lodge is just a watering hole, and all the marinas close for the winter. The only place around here to get gas is the same places you would buy for your car.
I'll be out today, I'll see if it does the same. I'm more concerned about the rev limiter thing. The clutch always has been perfect, and only hit the limiter when it's "cold", but like I said, the last time I was out, I hit it every time I pinned the throttle.
Nate
 
If the sled sits outside in the cold you will take a long time to heat everything , especially the belt ! Leave home ride to the gas station and put your hand on the clutchs , if less than 2 miles , or slipping a cold belt they will not be warm. Just think of how stiff that cold belt is !
 
The sled sits in my garage most every night. I rode pretty hard today, and it still did the same thing. I have towed 3 sleds within the last 3 nights, though.
I have to try tomorrow, but I thought I noticed some gear noise when I came out of a cornerand stomped on it about 1/2 mile from my house. I did notice that when putting it in reverse today, the gears didn't mesh right and I got the gear noise. I wonder if there could be something not aligned right? It could possibly be the noise of the studs spinning on something? I'm ging to start a new thread to see if anybody has had any gear box trouble.
Nate
 


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