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Just got a 670 and have some problems

3K views 9 replies 4 participants last post by  kccats 
#1 ·
So hers the problem it is very very hard to pull over. Now I know they are generally hard because of the displacement, but mine is nearly impossible to pull the first pull. Then after that I can pull it over but still take all i have. Once its going and warm it will one pull start after the first pull locks up. I took the belt off and no change with the plugs out it is very easy to pull. other then that when is running you punch it around 2k it has a little bog then when the clutch grabs around 4400 it launches. Witch I heard is normal. Any ideas?
 
#2 ·
I'm guessing that it is a 97 or earlier? You can find newer recoil assemblies and that will help tremendously. The pulley the rope is wrapped around on the older ones was smaller. About 1.25" smaller.

I have the 95 583 and it is hard to pull over. Specially not fun when it is really cold.

Bottom line, it is normal.
 
#6 ·
What makes an engine hard to pull over cold is the oil that is left on the cylinder walls.
When it is cold it is thicker and therefore creates a higher compression which results in more resistance to rolling over.
A way I have found to pull such an engine over more easily is to pull it gently until you have a piston on compression and then give a short hard pull.
This makes the engines compression work for you when it kicks past that first compression stroke.
 
#7 ·
Just for a test, take the belt off and see how hard it is to turn the clutch in both directions. Any noises?

Might be some oil/gunk built up on the rotary as well, but I'm telling you, they are difficult.


This one trip, my brother and a friend had borrowed some machines. We had a Summit 500, Summit 670, and a Grand Touring 670. Our trip started out it was -23F, but it was "suppose to warm up" At -20F these machines are tough to start, but can be done by one person.

After spending the night at the cabin, the "suppose to warm up" didn't come around and it actually dropped to -45F that night. Next day we waited around until it "warmed up" to -40 and then decided to get the heck out of there. I'm on the Summit 670. I go to pull the rope slowly to take it through a few cycles and I cannot budge it at all. Open the hood and move the clutch back and forth until it was able to make a full turn. Then TWO of us pulling on the rope pulled it over slowly some more until we felt it was loose enough that we could give it a couple of good pulls. It fired on the 2nd pull then and I was quick to the primer to keep it running until it warmed up.
Then to the Grand Touring. It has E-start, but we never use the E-start when it cold as it will shatter the mounts. So same process except it only took one person to pull on it as it was a year newer and had a bigger pulley.
The 500, of course, was easy to start.


ps to all of this, the oil in the reservoir was like peanut butter. We mixed our tanks for the trip out.
 
#8 ·
The clutch doesn't make any noises it was colder yesterday around 75 I cleaned both carbs and drained old fuel and added new. I gave it awhile to sit then it started first pull. today its closer to 95 with about 80 percent humility and it didn't want to start im just assuming that weather related.
 
#9 ·
Shouldn't make a difference at those temps. Even at 110° it would be fine to start it. Just don't let it idle very long.

I will say this though, my 95 - 583 is still hard to pull at 60-70 above.
 
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