Decompression lever

Bigearl

Member

Equipment
B8200 hst
Dec 6, 2018
50
0
6
Forest Lake mn USA
Do you guys use this on the older b models? The knob on my b8200 is stuck, and I think to figure out the issue I’d have to pull the valve cover. Maybe the cable is froze up? Thoughts?
 

Lil Foot

Well-known member
Lifetime Member

Equipment
1979 B7100DT Gear, Nissan Hanix N150-2 Excavator
May 19, 2011
7,260
2,204
113
Peoria, AZ
The cable on my B7100 was froze up when i got it. A few zaps with WD-40 and working it back & forth and it is free like new now. I use it on every start up.
Although mine is a knob, not a lever, but same effect.
 

Attachments

Last edited:

Russell King

Well-known member

Equipment
L185F, Modern Ag Competitor 4’ shredder, Rhino tiller, rear dirt scoop
Jun 17, 2012
4,607
977
113
Austin, Texas
It should be easy to disconnect the cable at the engine end and see if it is cable or the linkage that’s stuck.

You can also just spray the linkage on the engine and see if it will work free by hand

I use mine especially if the battery is a bit weak from sitting too long


Sent from my iPad using Tapatalk
 

NoJacketRequired

Active member

Equipment
B7510 & LA302 FEL & B2782 blower, B7510 & B2781 blower, B2410 & B2550 blower
May 25, 2016
415
47
28
Ottawa, Ontario
On the B7200 I had the cable was frozen up and the lever on the cylinder head was frozen up. It still started just fine through a very cold winter. Of course I made sure I had a good battery and I pre-heated the machine with a kerosene salamander heater. Oh, and 30 seconds of glow plug.

Later on in the ownership of this tractor I realized what that knob was supposed to do and freed it up. Yes, starting was a bit easier, but not so much that I would have torn the tractor apart to fix it if it stopped working again.

I would imagine that if you don't have a means to pre-heat the tractor the importance of a working decompressor would increase in an inverse ratio to temperature.
 

North Idaho Wolfman

Moderator
Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
28,306
4,858
113
Sandpoint, ID
Take a picture of the starter, if the starter has replaced with the newer style starter the decompression Knob really becomes worthless because the newer starter spins faster and will spin just as fast under load. ;)
 

Bigearl

Member

Equipment
B8200 hst
Dec 6, 2018
50
0
6
Forest Lake mn USA
I didn’t get a picture of the starter, but I verified tonight that the cable is not froze up. The decompression mechanism is definitely froze up. I gave it a light tap with a punch to see if I could free it up but I don’t want to crack the valve cover. As of right now it has no problem starting in the cold so I think I’m just going to leave it. Maybe this spring I’ll pull the cover to see why it’s stuck.

Should I be able to pull the knob when the engine is not running or does this get pulled as it’s turning over?
 

Russell King

Well-known member

Equipment
L185F, Modern Ag Competitor 4’ shredder, Rhino tiller, rear dirt scoop
Jun 17, 2012
4,607
977
113
Austin, Texas
You can pull it anytime really but can do damage.

Pull it out prior to turning key to the start position to allow engine to spin easily. Then push in when engine is spinning to allow tractor to start.


Sent from my iPad using Tapatalk
 

Rodnok

Member

Equipment
B7100hst, MMM, Box Scraper, FEL make unknown, adapted and resurrected from junk
Dec 28, 2015
48
0
6
chattanooga, tn
You can pull it anytime really but can do damage.

Pull it out prior to turning key to the start position to allow engine to spin easily. Then push in when engine is spinning to allow tractor to start.


Sent from my iPad using Tapatalk


Does a 1995 b7100 have this decrompession lever/knob?


Sent from my iPhone using Tapatalk
 

Piker

Member

Equipment
2012 Kubota 2320, 2002 Honda Rubicon
Dec 1, 2010
164
0
11
Riverview, NB, Canada
Cable was seized up on my 1980 B7100 when I bought it. Got a universal choke cable from Napa & cut sheath & inner cable to fit & it worked great for 3 yrs. Tractor has since been replaced with a B2320.
 

North Idaho Wolfman

Moderator
Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
28,306
4,858
113
Sandpoint, ID
Does a 1995 b7100 have this decrompession lever/knob?


Sent from my iPhone using Tapatalk
I do believe that the newer B7100's did not have a decompression Cable/knob, or at least the two I have do not have it. ;)
 

85Hokie

Moderator
Staff member
Lifetime Member

Equipment
BX-25D ,PTB. Under Armor, '90&'92-B7100HST's, '06 BX1850 FEL
Jul 13, 2013
10,274
2,105
113
Bedford - VA
Does a 1995 b7100 have this decrompession lever/knob?


Sent from my iPhone using Tapatalk
I have a 1990 model ..... has one .....

1992 model does not have one.
 

Rodnok

Member

Equipment
B7100hst, MMM, Box Scraper, FEL make unknown, adapted and resurrected from junk
Dec 28, 2015
48
0
6
chattanooga, tn
I do believe that the newer B7100's did not have a decompression Cable/knob, or at least the two I have do not have it. ;)


Mine does not have one either. That must be due to the improved starter? I have never had an issues starting even in cold weather. Except when I ran out of fuel one time.


Sent from my iPhone using Tapatalk
 

North Idaho Wolfman

Moderator
Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
28,306
4,858
113
Sandpoint, ID
Mine does not have one either. That must be due to the improved starter? I have never had an issues starting even in cold weather. Except when I ran out of fuel one time.


Sent from my iPhone using Tapatalk
Starter change was part of it and there was also a huge improvement in batteries during that time period, better CCA's in a smaller package. ;)
 

Rodnok

Member

Equipment
B7100hst, MMM, Box Scraper, FEL make unknown, adapted and resurrected from junk
Dec 28, 2015
48
0
6
chattanooga, tn
Starter change was part of it and there was also a huge improvement in batteries during that time period, better CCA's in a smaller package. ;)


Very true. Now if only they could perfect lithium ion for tractors/cars


Sent from my iPhone using Tapatalk
 

Berry

Member

Equipment
B7200HST B2551 Blower Scraper Flail Mower Chipper Log Splitter
Jun 7, 2020
133
7
18
Bancroft Ontario
Take a picture of the starter, if the starter has replaced with the newer style starter the decompression Knob really becomes worthless because the newer starter spins faster and will spin just as fast under load. ;)
learning more every day. How can you tell if you have the new design starter?