1994 v-max Wont go over 35mph, sometimes

Jeepers79

Jeepers79

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Sep 26, 2005
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Fox Lake, IL
here is the deal,

1994 Yamaha V-Max 600 3k miles.

Last weekend my g/f and I were up in Land O Lakes Wi. First day we did over 200 miles with no issues. Just at the end of the day my girlfriend says somethings wring w/ the sled, there are times we are all doing 50- 60 and she cant get the thing up and over 35 mph.

Its not all the time, I drove it and its like you can put the throttle ALL the way down, and it will just stay at say 35, rpms will not climb. Then sometimes if you start from a stop at full throttle it will climb up over 50, if you keep it at that speed its fine, but once you go below say 40 - or 35, you cant get back up again.

Any suggestions? Dirty carbs? Sled only has 3k miles or so and have not had any other issues w/ it.

It also does NOT seem to have a whole lot of power, but I guess I don't know what to expect, i am just comparing it to my Formula III 600, but this one is also a 600 and can NEVER keep up with my fIII from the line, or at top end. (but it was like this even before this issue)

Any ideas?

Thanks!
Mike
 
Jeepers79 said:
here is the deal,

1994 Yamaha V-Max 600 3k miles.

Last weekend my g/f and I were up in Land O Lakes Wi. First day we did over 200 miles with no issues. Just at the end of the day my girlfriend says somethings wring w/ the sled, there are times we are all doing 50- 60 and she cant get the thing up and over 35 mph.

Its not all the time, I drove it and its like you can put the throttle ALL the way down, and it will just stay at say 35, rpms will not climb. Then sometimes if you start from a stop at full throttle it will climb up over 50, if you keep it at that speed its fine, but once you go below say 40 - or 35, you cant get back up again.

Any suggestions? Dirty carbs? Sled only has 3k miles or so and have not had any other issues w/ it.

It also does NOT seem to have a whole lot of power, but I guess I don't know what to expect, i am just comparing it to my Formula III 600, but this one is also a 600 and can NEVER keep up with my fIII from the line, or at top end. (but it was like this even before this issue)

Any ideas?

Thanks!
Mike
Click to expand...

Clutch binding/sticky, maybe. Check them both out.
 
No light at the time of it doing this no. It lights up when i start it.. thats all

I thought the clutch too, but it just does not FEEL like that, and sometimes if you hold the throttle it will let rpms climb up.

The sled does engage almost AS SOON as you touch the throttle, not sure if thats normal clutch operation.


Way to override Torrs?
 
I with the crewchief you've got clutch issues. When the F3 first came out they were fast but in a 30mph rolling start against my 94 600 VMax I would pull 1-2 lengths up to 70-80 before he could reel me in.
 
oh this thing is a DOG compared to that fIII I run circles around it all day long. Basically you have to full throttle it ANY time to get it moving!

Ideas of where to start on the cluch (im a newbee with the sled) Also, is it normal for the clutch to engage at like 2k rpms or less? My FIII kicks in at 4500, help with this dog!! LOL
 
Has it ever blown the belt? I lost a belt once and the pieces of the belt got stuck in the primary and kept it from releasing fully. It killed the performance. Acted like a stick shift vehicle being driven in the wrong gear.
Remove the primary cover and inspect the rollers and arms for wear.
 
Hopefully it didn't blow a piston ring. Slowly pull the pull start out you will know right away if you have a dead cylinder or a ring stuck. You should each piston building up compression. If it easy then hard then easy again or vice versa may have a stuck ring or broken ring.
 
It has not blown a belt since "I" have owned it but may before me. this is my first season with it.

I cna do a compression check on the motor, didnt do that yet
 
caravanman said:
Has it ever blown the belt? I lost a belt once and the pieces of the belt got stuck in the primary and kept it from releasing fully. It killed the performance. Acted like a stick shift vehicle being driven in the wrong gear.
Remove the primary cover and inspect the rollers and arms for wear.
Click to expand...
yeah it feels like im in 3rd gear,,, ll the time!
 
no it idles low, maybe 1k 1500...
clutch engaes at like 2k TOPS!

What should it engage at? Any suggestions on how to change it? I have not played w/ clutches before..
 
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THANKS for the info!

Okay, so I have taken the belt off, It lookes trashed, do you thinki a belt could simply be my problem?
AS for the clutch I do not SEE any broken items but that does not mean a spring is weak? Suggestions as to what to do from here. Do I replace the springs anyway?

The rollers, some seem to be tight, and some slide/roll with ease. Is this normal??
 
Try the belt first, you will need one anyways. Then I would recomend cleaning both clutches and replacing both srings. It should engage around 3250 to 3500. Sounds like a weak primary spring. Maxdlx
 
I agree with Maxdlx. If you replace the secondary spring as well, make sure you put it back together with the correct wrap. (a-2 or b-2, depending on model) If you haven't already measured the Primary spring 'free height' the 78mm from the spec page is equal to 3.07". This is more me just being curious to see what it is, since it isn't broken.
 
i'm not familiar with with your setup but i would think the clutch should come in a a higher rpm. the stock clutch on my srx comes in @3800.
 
The last 94 600 we had in our group started shredding belts when the secondary bushings were shot. If you put it all back together, and it works fine with the new belt, keep an eye on it. If it starts falling off performance wise fairly quick, you should look deeper. I always thought these sleds were very quick for how bulky they are/feel. There shouldn't be a night and day difference between this sled and yours. I believe I read on another thread that the 94's had around 150 psi compression when new (factory thin head gasket), but I can't say with any certainty that yours should read that high, I'd check it while you're tinkering with the clutches, just for giggles.
 
Guys thanks for the help, here is the latest.

Took off carbs cleaned them, didnt look too bad. Put a new belt on the sled and ran it.. with the basic same results. Checked compresson on the motor, and I am right at about 120 psi in both. Yes, this sled is NIGHT and DAY difference from my formula III

In looking at the clutch, didnt pull it apart I am noticing a few things maybe someone can shead some light on. In the first photos I am noticing the belt deflection seems a little low, would anyone agree?
According to the owners manual: "To ensure propper clutch performance the spacers in the secondary clutch must be repositioned as the v-belt wears. Suggests for a NEW belt there should be 2 spacers between sheaves. Thoughts on this?

Next thing I noticed is this bushing (for lack of better term) on the shaft seems to just be floating there. I can move it from in or out, its just floating there under the spring. Is this normal?

And as far as cleaning goes, do I just pull them apart and clean the rollers and the like? Sorry I have not messed with clutches ever before this, I do thank you all for the help!!



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Mike
 
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