Snowmobile Fanatics banner

1 - 20 of 22 Posts

·
Registered
Joined
·
29 Posts
Discussion Starter #1
I've got a 03 vmax 600er and the #3 plug will foul if left idleing too long. What's too long? a few minutes maybe? I have a exact twin sled and it never fouls.
If I just use and don't try to let it idle much it it's fine. No problems and seems to perform like it's sister that I have. It may backfire though sometimes on restart.

I'm strapped for money right now and don't want to have to take it in to get serviced. Would it be ok to ride it as it is?
 

·
Registered
Joined
·
29 Posts
Discussion Starter #4
Originally posted by daman
[br]Check your main jets(for the right size) clean carbs..
I had the carbs cleaned last year and it still did it and I only put about 100mi. on them last year.. I put it off as no one seemed concerned but I don't like it.

How about the pilot screw adj on these? That wouldn't do anything?

Thanks for the sizes. I'll save them.
 

·
Registered
Joined
·
849 Posts
Originally posted by CaptCaper
[br]
Originally posted by daman
[br]Check your main jets(for the right size) clean carbs..
I had the carbs cleaned last year and it still did it and I only put about 100mi. on them last year.. I put it off as no one seemed concerned but I don't like it.

How about the pilot screw adj on these? That wouldn't do anything?

Thanks for the sizes. I'll save them.
You need to fix this problem..

Fuel Screws are 2 from seat,you could try a little less too


i would check to see what jets you have in there first

are you using BR9es plugs???

are you idling 1,500-1,700 rpms
 

·
Registered
Joined
·
29 Posts
Discussion Starter #6
You need to fix this problem..

Fuel Screws are 2 from seat,you could try a little less too

i would check to see what jets you have in there first

are you using BR9es plugs???

are you idling 1,500-1,700 rpms
[/quote]

When the plug isn't fouled it is idling at 1,500-1,700.
I am useing BR9ES plugs as well. When foulded it will drop below that of course. Mostly when the idle starts to drop if I throttle it up or go it will clear up and run fine.

I'm dissapointed as the mechanic didn't take care of this as I asked him to look into it. I won't go back there.

I have M31's . My manual shows a Pilot screw in the middle of the carb between the bowl and opening for the incoming air. Is that what you mean by fuel screws? The pilot screw?

I will check the size as soon as I can.
 

·
Registered
Joined
·
29 Posts
Discussion Starter #8
[/quote]

yes,,

plugs gapped to .28 or .29 mm.????
[/quote]

I've been setting them at .30 .29..

The manual calls for .28 to .31
 

·
Registered
Joined
·
55 Posts
It cant be main jets at idle. the main jets dont come into play at idle. You would have to check you Pilot jets. You can also check to see if the fuel screw is out 2 turns.
 

·
Registered
Joined
·
849 Posts
Originally posted by yamyrider
[br]It cant be main jets at idle. the main jets dont come into play at idle.
Right but he still needs to check things out,thats why i gave him
the specs to check.

P/J's-42.5

there could be somthing not right in his needle and seat
in that carb too,not sealing right
 

·
Registered
Joined
·
366 Posts
If it is fouling a plug at idle, it is not an emergency situation.
And there is no need to leave it idle so long anyway.
On a cold start after it idles a short time, take off and drive slowly and gradually increase speed.

Swap the the spark plug cap from that cylinder and another one and see what happens.
 

·
Registered
Joined
·
29 Posts
Discussion Starter #13
Originally posted by PZ1
[br]If it is fouling a plug at idle, it is not an emergency situation.
And there is no need to leave it idle so long anyway.
On a cold start after it idles a short time, take off and drive slowly and gradually increase speed.

Swap the the spark plug cap from that cylinder and another one and see what happens.
OK thanks.

I'll try swapping it. But I'll wait til we get some snow to ride. Maybe Tue. they say.

Still has the old fuel and stabilizer in it and old plugs. I'll put fresh fuel and run it and then change plugs and well see. But it did it last year. The other sled never fouls it seems.

I never had a performance problem with this one as long as you didn't let it get fouled up good.

Jim
 

·
Registered
Joined
·
29 Posts
Discussion Starter #15
Originally posted by daman
[br]Check your P/J Jim,,

my brother in-law has the same sled but a '02,, and that thing
will idle all day long if you let it.

it should not do that,thats not normal......

you need to let a L/Q sled warm up before riding or you
could cold seiz it.
I checked quick yesterday and couldn't find it. I'll have to check more closley or when I get some extra money I'll take it in to a certified Yamaha Dealer and get an estimate. There's one guy who claims $43.00 for a estimate with hard parts extra.

I've turned jets before but I have to find this one. It wasn't were I thought it would be.

Anyone have pic's of a pinpoint location on these M31's?
 

·
Registered
Joined
·
29 Posts
Discussion Starter #17
Originally posted by daman
[br]P/J's are in side the carbs(bowl) you need to pull the rack out to
check..
ok thanks..the manual shows the Pilot Jets outside under the bracket that holds the carbs. If I used a mirror I might be able to see the spot the manual showed but I have'nt got to that point.

Is the repair manual from Yamaha better than the aftermarket ones?
Maybe I should get one of those somewhere anyway.
 

·
Registered
Joined
·
849 Posts
Originally posted by CaptCaper
[br]
Originally posted by daman
[br]P/J's are in side the carbs(bowl) you need to pull the rack out to
check..
OK thanks..the manual shows the Pilot Jets outside under the bracket that holds the carbs. If I used a mirror I might be able to see the spot the manual showed but I haven't got to that point.

Is the repair manual from Yamaha better than the aftermarket ones?
Maybe I should get one of those somewhere anyway.
thats your pilot air screw on the out side,set that to the
adj. spec i gave ya 3 or less from seat.

yes i think the Yamaha manuals are better,thats all i own.
but any i think would be fine better then nothing..
i
 

·
Registered
Joined
·
366 Posts
Originally posted by daman
[br]Check your P/J Jim,,

my brother in-law has the same sled but a '02,, and that thing
will idle all day long if you let it.

it should not do that,thats not normal......
[red]
you need to let a L/Q sled warm up before riding or you
could cold seiz it.[/red]
That is why to run it slowly for a while and then gradually increase speed after letting it idle for a period. It does not have to idle until the temperature is up to normal. That would take a long time at low temps.
What I was saying about not leaving it idle was in regards to running the sled or having to have it fixed right away. It is okay to run it, but if it is fouling plugs when it idles - to prevent having to buy and change plugs, don't let it sit and idle when the motor is warm until it is fixed.

Just trying to offer some help.


.
 

·
Registered
Joined
·
849 Posts
Originally posted by PZ1
[br]
Originally posted by daman
[br]Check your P/J Jim,,

my brother in-law has the same sled but a '02,, and that thing
will idle all day long if you let it.

it should not do that,thats not normal......
[red]
you need to let a L/Q sled warm up before riding or you
could cold seiz it.[/red]
That is why to run it slowly for a while and then gradually increase speed after letting it idle for a period. It does not have to idle until the temperature is up to normal. That would take a long time at low temps.
What I was saying about not leaving it idle was in regards to running the sled or having to have it fixed right away. It is okay to run it, but if it is fouling plugs when it idles - to prevent having to buy and change plugs, don't let it sit and idle when the motor is warm until it is fixed.

Just trying to offer some help.


.
i agree PZ1, no you don't need to let it warm up that long
just 5 min. and then take off is what i meant..
 
1 - 20 of 22 Posts
Top