Decomp Adjustment [SOLVED]

User avatar
scootermcq
Joined a 250cc Club
Posts: 591
Joined: Mon Jun 01, 2015 6:15 am
My Bike: VS1400 + VL1500
Location: Ontario, Canada
Status: Offline

Decomp Adjustment [SOLVED]

Postby scootermcq » Mon Mar 07, 2016 6:08 am

My decomp does not seem to be opening properly when I fire up the bike. I have read through the service manual and I find some of the procedure a little confusing.

Can anyone walk me through the procedure in a little bit plainer English than the shop manual lays it out?
Scott

Image

User avatar
WintrSol
Got My M1 License!
Posts: 455
Joined: Fri Feb 26, 2016 2:02 pm
My Bike: CB450 GL1500CT
Location: Near St. Louis, MO
Status: Offline

Re: Decomp Adjustment

Postby WintrSol » Wed Mar 09, 2016 10:58 am

Having helped a friend adjust his, I understand your difficulty with the manual; interpreting it took a lot of thought, while examining the engine. Unfortunately, it's been over a year, and I don't have a copy of the service manual to refresh with, or I could help walk you through it. Got a link to one?
Florissant, MO
CB450K3, GL1500CTValkyrie

User avatar
scootermcq
Joined a 250cc Club
Posts: 591
Joined: Mon Jun 01, 2015 6:15 am
My Bike: VS1400 + VL1500
Location: Ontario, Canada
Status: Offline

Re: Decomp Adjustment

Postby scootermcq » Wed Mar 09, 2016 12:52 pm

I do have a manual.... which I reread about 5 times and it is sinking in.

I also found info a Mocs place which makes it much easier than the manual way. It's interesting that it is so different adjusting the decomp on a 1500 vs 1400
Scott

Image

User avatar
scootermcq
Joined a 250cc Club
Posts: 591
Joined: Mon Jun 01, 2015 6:15 am
My Bike: VS1400 + VL1500
Location: Ontario, Canada
Status: Offline

Re: Decomp Adjustment

Postby scootermcq » Mon Mar 21, 2016 7:14 am

Just as an update if anyone is following this thread. I found an easy way to do it, rather than open up the crankcase to spin the piston to TDC and have to replace gaskets and go to all that work.

While the bike is idling, push the decomp lever with your finger. You can feel it being "bumped" and then just lower it a wee bit so it is not making contact when TDC. Remove the slack from the cable and Bob's your Uncle, it's adjusted.
Scott

Image

stillrolling
Tricycles are Cool
Posts: 14
Joined: Tue Dec 12, 2017 10:02 am
My Bike: 1996 Suzuki Intruder VS1400
Status: Offline

Re: Decomp Adjustment [SOLVED]

Postby stillrolling » Thu Dec 14, 2017 8:13 am

Is there a danger of going to far to get "bumped" and possibly doing damage. Bad luck seems to follow me and I'd hate to have to put new pistons in again........ Like when I dropped a carb screw in the front cylinder.....I found it when I started it....ugh.

Forge
Got My M1 License!
Posts: 494
Joined: Mon May 08, 2017 8:16 pm
My Bike: 05 Suzuki Boulevard S83
Location: San Antonio, TX
Status: Offline

Re: Decomp Adjustment [SOLVED]

Postby Forge » Fri Dec 15, 2017 2:01 pm

stillrolling wrote:Is there a danger of going to far to get "bumped" and possibly doing damage. Bad luck seems to follow me and I'd hate to have to put new pistons in again........ Like when I dropped a carb screw in the front cylinder.....I found it when I started it....ugh.


Holy crap. What a nightmare!
L'Chayim! To Life! :cheers:

User avatar
WintrSol
Got My M1 License!
Posts: 455
Joined: Fri Feb 26, 2016 2:02 pm
My Bike: CB450 GL1500CT
Location: Near St. Louis, MO
Status: Offline

Re: Decomp Adjustment [SOLVED]

Postby WintrSol » Sat Dec 16, 2017 6:45 am

stillrolling wrote:Is there a danger of going to far to get "bumped" and possibly doing damage. Bad luck seems to follow me and I'd hate to have to put new pistons in again........ Like when I dropped a carb screw in the front cylinder.....I found it when I started it....ugh.

I think the decomp mechanism provides a fixed amount of lift, so shouldn't interfere with the pistons. The adjustments just get it to the point where it is properly activated and deactivated.
Florissant, MO
CB450K3, GL1500CTValkyrie


Return to “M90/C90/LC1500”

Who is online

Users browsing this forum: No registered users and 2 guests