Yamaha XLV 540 - Snowmobile Forum: Your #1 Snowmobile Forum
http://www.snowmobileforum.com
Go Back   Snowmobile Forum: Your #1 Snowmobile Forum > Specific Snowmobile Forums > Yamaha Snowmobiles


» Sponsors





Reply
 
LinkBack Thread Tools Display Modes
Old 01-04-2010, 10:08 PM   #1 (permalink)
Registered User
 
Join Date: Dec 2009
Posts: 36
Yamaha XLV 540

Hi-
I picked up a 1986 Yamaha XLV 540 last weekend at a price that I couldn't pass up. Everything on the sled is in good shape, but it is not running right now. With the help of a friend who is a mechanic I will be going through the sled and doing what it takes to get it running. The seller has guaranteed good compression, as well as any other parts we need to get the sled running, as stated on the bill of sale. Is there anything in particular that I should pay attention to? Thanks in advance.
janvds is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-16-2010, 01:49 PM   #2 (permalink)
Registered User
 
SRVx3's Avatar
 
Join Date: Feb 2010
Location: ohio
Posts: 42
great motors. if compression is good only 2 things to start with, spark then fuel. I see this is an older post let me know how it is going for you.
SRVx3 is offline   Reply With Quote
Old 02-16-2010, 04:41 PM   #3 (permalink)
Registered User
 
Join Date: Dec 2009
Posts: 36
Yes I agree- the 540 is a good motor. A friend of mine went through the sled thoroughly a couple of weeks ago and it runs quite well. Compression was good on the motor but a bit on the low side. It is better now, but not quite where it should be. We think the problem lies with the carbruetor. Which reminds me- if compression is low, what can be done to raise it? Also, once the sled has been running for a while, the throttle is hesitant as you open it up from a complete stop.
janvds is offline   Reply With Quote
Old 02-16-2010, 04:58 PM   #4 (permalink)
Registered User
 
SRVx3's Avatar
 
Join Date: Feb 2010
Location: ohio
Posts: 42
Tear the top end down, and check pistons and rings. How many miles are on this motor? should be able to do a rebuild for fairly cheap. the carb is pretty simple to tear down. Take carb off sled and work on a table and it should be no problem. specs on mixture screw should be under your hood somewhere i believe its 2 turns out.
SRVx3 is offline   Reply With Quote
Old 12-20-2010, 12:29 PM   #5 (permalink)
Registered User
 
Join Date: Oct 2010
Location: N. Dakota
Posts: 216
I am curious what your compression was at. I have the same sled 1985 and have lower than usual compression too. I just put on 30 miles yesterday and it ran pretty darn good. I think I have to clean my carb though because I don't have a whole lot of high end. Low and Mid is great though. How is your sled running now?

I know this post is old but I thought I'd give it a shot at getting a reply from you.
mosabi is offline   Reply With Quote
Old 12-20-2010, 09:14 PM   #6 (permalink)
Registered User
 
Join Date: Dec 2009
Posts: 36
Hi,
If I remember correctly the compression was at 100...I think it should be around 110. The motor has about 7,000 miles on it.
janvds is offline   Reply With Quote
Old 12-20-2010, 10:02 PM   #7 (permalink)
Registered User
 
Join Date: Oct 2010
Location: N. Dakota
Posts: 216
Janvds
Mine has 90 and 110. Mine starts and runs pretty good. Have you rebuilt anything yet? Did you fix the issue you had with it?

Last edited by mosabi; 12-20-2010 at 10:25 PM. Reason: Added questions
mosabi is offline   Reply With Quote
Old 12-01-2011, 05:52 PM   #8 (permalink)
Registered User
 
benhadfield13's Avatar
 
Join Date: Nov 2011
Location: Alaska
Posts: 46
hey...Can you guys tell me how to post a quetion plz...i'm new here...but i had a couple q's...I have a yamaha xl-v 540 cc i dunno the year prob like 1985-1990. Anyway...I need to know how to drain the chaincase oil and how much oil to put back in. How to take the carb off...I need like step by step as i'm just learning this stuff. And how to clean the carb too. It won't idle and I think it's because the jets are all clogged up. Anything I should know about this sled? Thx guys.
benhadfield13 is offline   Reply With Quote
Old 12-01-2011, 06:11 PM   #9 (permalink)
-LIFETIME MEMBER-
 
Join Date: Nov 2009
Posts: 4,986
Quote:
Originally Posted by benhadfield13 View Post
hey...Can you guys tell me how to post a quetion plz...i'm new here...but i had a couple q's...I have a yamaha xl-v 540 cc i dunno the year prob like 1985-1990. Anyway...I need to know how to drain the chaincase oil and how much oil to put back in. How to take the carb off...I need like step by step as i'm just learning this stuff. And how to clean the carb too. It won't idle and I think it's because the jets are all clogged up. Anything I should know about this sled? Thx guys.
theres a "new thread" option on the upper left in black, just below the red banner. others may be able to describe or explain it better and will hopefully chime in.

to answer a few of your questions, there is no provision for draining the chain case on that sled. you can suck it out with a hand pump or mityvac if you have access to one, or just bite the bullet and remove the cover and clean up the mess. pipe needs removed to access the cover bolts. gasket most times wont be reusable. i use moto-seal 1 insted of buying new. takes 8 oz (250cc) of new oil. 75w80 api gl-3

to remove the carb, its a wiggle match between you, the rubber boots and the airbox. treat the rubber boots with kid gloves.

cleaning is easy for the most part. careful on the phillips screws holding the float bowl, they are easily stripped.

more info as you need it. welcome to the forum. lots of help on this site. best if you figure out how to start your own threads. took me awhile to figure it out as well.
yamadad4 is offline   Reply With Quote
Old 12-01-2011, 09:25 PM   #10 (permalink)
Registered User
 
benhadfield13's Avatar
 
Join Date: Nov 2011
Location: Alaska
Posts: 46
By "pipe" do you mean the muffler? And when you said it takes "8 oz. (250cc of oil" What do you mean by 250cc? Like that's how much for a 250 engine? what do you mean by "Treat the rubber boots with kid gloves"? I just got this for free and am just working on tuning it up for the season. I have taken it for a couple rides but it doesn't idle so...I also need to know where the grease points are. Anything else I need to do to tune it up? Is there an air filter in the airbox I need to clean? Thx alot your really helping!
benhadfield13 is offline   Reply With Quote
Old 12-01-2011, 09:49 PM   #11 (permalink)
Registered User
 
benhadfield13's Avatar
 
Join Date: Nov 2011
Location: Alaska
Posts: 46
And also I don't really what the hyfax is for so could you tell me? And where could I get a new gasket for the chaincase cover?
benhadfield13 is offline   Reply With Quote
Old 12-01-2011, 11:27 PM   #12 (permalink)
-LIFETIME MEMBER-
 
Join Date: Nov 2009
Posts: 4,986
Quote:
Originally Posted by benhadfield13 View Post
By "pipe" do you mean the muffler? And when you said it takes "8 oz. (250cc of oil" What do you mean by 250cc? Like that's how much for a 250 engine? what do you mean by "Treat the rubber boots with kid gloves"? I just got this for free and am just working on tuning it up for the season. I have taken it for a couple rides but it doesn't idle so...I also need to know where the grease points are. Anything else I need to do to tune it up? Is there an air filter in the airbox I need to clean? Thx alot your really helping!
if you want to call it a muffler, yes.

8 fluid ounces or 250cc's. same amount, different measuring systems.

you will see a rubber boot on both the airbox side and the engine side of the carb. on a sled from that vintage, these boots can become hard and or brittle. almost impossible to find replacements so handle with care. in order to remove the carb for cleaning(which sounds like you need to do) you must mess with these. there is a spring type clamp unless someone has changed them over.

no air filter to address. as for grease points, you will find one on each side of the front spindles and maybe three on the crosshafts on the rear suspension.

the hyfax are the plastic pieces attached to the rails on the rear suspension, sometimes referred to as slides or sliders.

you would have to contact a dealer for the chaincase gasket or any online yamaha parts vendor. thats why i suggested the moto-seal. its made by permatex, about $5 or so at any auto parts house, quicker and cheaper than the oem gasket.
yamadad4 is offline   Reply With Quote
Old 12-02-2011, 12:50 AM   #13 (permalink)
Registered User
 
benhadfield13's Avatar
 
Join Date: Nov 2011
Location: Alaska
Posts: 46
Thanks a million! And what do the boots look like? If you could possibly get a picture...(don't have too) of the boots that would be awesome!! Thanks again!
P.S. I see you live between the border of Idaho and Washington, I used to live in Spokane Washington, so jw where you live.
benhadfield13 is offline   Reply With Quote
Old 12-02-2011, 01:46 AM   #14 (permalink)
Registered User
 
aduck's Avatar
 
Join Date: Feb 2010
Location: northern il
Posts: 3,187
if you look at the carbs you cant miss the boots they're on the front and back of the carbs. black and round clamped airbox to carb , carb to motor
__________________
93 mach1 670
02 rmk 800 162
95 powder special 580
aduck is offline   Reply With Quote
Old 12-02-2011, 09:56 AM   #15 (permalink)
Registered User
 
benhadfield13's Avatar
 
Join Date: Nov 2011
Location: Alaska
Posts: 46
So can you tell me specifically what they are...here are some pics of my engine and the carb. It only has one carb. I"m sorry if I'm bothering you but I just don't want to screw this up. So it's the 2 black things on either side of the carb? And what do they do?
Attached Thumbnails
Yamaha XLV 540-snowmobile-carburetor-001.jpg   Yamaha XLV 540-snowmobile-carburetor-002.jpg  
benhadfield13 is offline   Reply With Quote
Old 12-02-2011, 10:35 AM   #16 (permalink)
Registered User
 
Join Date: Oct 2010
Location: N. Dakota
Posts: 216
Hi Ben! Welcome to the forums. I have the same machine so I can help you out.

In the first pic directly in the center is the carb. I see you already have the choke plunger out of it, be careful not to lose any of those pieces on the end of the cable there. On the far right is the air box (Black box) the boot coming from this box is extremely hard and most likely getting brittle so any excessive wiggling motion isn't good for it. The other one on the left side of the pic is easier to find (www.denniskirk.com) has this item.

Here are my steps to remove the carburetor: These steps are the safest way but probably not the fastest.

1. Remove the seat (2 nuts rear underneath and 2 screws on the front sides of the seat)
1. Remove the fuel tank.
3. Remove air box with carb boot attached (make sure its unscrewed from the intake on the carb first before pulling out)
4. At this point the carb will easily come out assuming screw has been loosened on the intake boot (attached to the intake).

This carb is very simple to clean. You can find a diagram of it online, I dont have it handy but I think I posted it on one of my other posts. See thread here for some pics and what I've done to my sled. http://www.snowmobileforum.com/yamah...-has-come.html

Let us know how it goes or if you have more questions.
mosabi is offline   Reply With Quote
Old 12-02-2011, 10:45 AM   #17 (permalink)
Registered User
 
benhadfield13's Avatar
 
Join Date: Nov 2011
Location: Alaska
Posts: 46
Ok thanks alot! Oh and is there only the s[ring and that other peice on the end of the choke cable? And I took one of those bolts out of the black thing on the cylinder side of the carburetor, is that the boot? Should I put it back? I also loosened the screws on the other side, (on the clamps). Is that a boot also? Should I also put that back?
benhadfield13 is offline   Reply With Quote
Old 12-02-2011, 12:17 PM   #18 (permalink)
Registered User
 
benhadfield13's Avatar
 
Join Date: Nov 2011
Location: Alaska
Posts: 46
Oh, and by the intake do you mean the airbox?
benhadfield13 is offline   Reply With Quote
Old 12-02-2011, 01:48 PM   #19 (permalink)
Registered User
 
Join Date: Oct 2010
Location: N. Dakota
Posts: 216
Does this pic help any? Click to make bigger.
Attached Thumbnails
Yamaha XLV 540-snowmobile-carburetor-001.jpg  
mosabi is offline   Reply With Quote
Old 12-02-2011, 02:05 PM   #20 (permalink)
Registered User
 
benhadfield13's Avatar
 
Join Date: Nov 2011
Location: Alaska
Posts: 46
Yeah it does...can you look at this one and answer them plz?
Thanks.
Attached Thumbnails
Yamaha XLV 540-snowmobile-carb.jpg  
benhadfield13 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 08:12 PM.



Copyright SnowmobileForum.com

Search Engine Friendly URLs by vBSEO 3.6.0