• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Cylinder 1 and 4 not firing?

  • Thread starter Thread starter baesorenson
  • Start date Start date
B

baesorenson

Guest
GS1100GL. I have checked the coil and the primary end reads 5 ohms and secondary reads 30k ohms which is spec. I have checked for spark and it’s firing. Sometimes I get 3 hot. cylinder 4 will get hot then cylinder 1 stays cold. Last time I checked 4 didn’t fire. Bike has 11,500 miles. I’ve put marvel mystery oil in gas to see if it helps any over time. Does anyone have any info to troubleshoot? Or experienced the same issue?
 
Last edited:
baesorenson said:
I have checked the coil and the primary end reads 5 ohms and secondary reads 30 ohms which is spec. I have checked for spark and it?s firing. Sometimes I get 3 hot. cylinder 4 will get hot then cylinder 1 stays cold. Last time I checked 4 didn?t fire. Bike has 11,500 miles. I?ve put marvel mystery oil in gas to see if it helps any over time. Does anyone have any info to troubleshoot? Or experienced the same issue?
Click to expand...
What bike? It may be your signal if you have an electric ignition or the points for 1-4 may be out of adjustment if you have points.
 
It may be co-incidence that 1 and 4 are not firing, but spark is only part of the issue why they might not be getting warm.

You say you have 5 ohms on the primary and 30 ohms on the secondary. Unless you have mis-typed or mis-read your meter, you have a problem. You should have about 30K ohms on the secondary.

Have you checked valve clearances and cleaned the carbs? Either one of those can also contribute to a cylinder not firing enough to get warm, even though the spark is firing.

Because 1 and 4 share the same coil, it sort of automatically leads you to think it might be electrical, but don't rule out the other possibilities until you have actually checked them.

.
 
Yes 30K. Which is by the book. I have not took the valve cover off yet to check clearances. Carbs are cleaned with new stock jets.
 
Just checked valves and the clearance is as follows:

cylinder 1
intake- 0.04 mm was tight but went through didnt have a .03mm
Exhaust- 0.05mm

Cylind r 2
Intake- 0.05mm
Exhaust- 0.04mm

Cylinder 3
Intake- 0.06mm
Exhaust- 0.04 did not fit (again i don't have a 0.03mm size)

Cylinder 4
Intake- 0.06
Exhaust- 0.04 did not fit either

With that said i realize that cylinder 3 and 4 exhaust shim is more than likely out of spec but doesn't seem to be the issue of why cylinders 1 and 4 are not firing...
 
Do the simple stuff first...remove spark plug caps, cut plug wires back 3/8 inch, reattach caps or consider new caps (about $5 each). Clean the connections from signal coils,ignitor, and up to ignition coils.
Has this critter been sitting awhile? If yes, proper carb cleaning is on your to do list. These carbs don't like ethanol fuel hanging around theire innards
 
tom203 said:
Do the simple stuff first...remove spark plug caps, cut plug wires back 3/8 inch, reattach caps or consider new caps (about $5 each). Clean the connections from signal coils,ignitor, and up to ignition coils.
Has this critter been sitting awhile? If yes, proper carb cleaning is on your to do list. These carbs don't like ethanol fuel hanging around theire innards
Click to expand...


I’ve rebuilt the carbs with new jets and blew air down every hole I have cut wires and rescrewed cap on. I checked the coil and it’s reading fine on both ends. I checked spark plug for spark. I checked valve clearance and only have cylinder 3 and 4 exhaust tappers needs adjusting. Now I have to order new valve gasket to start bike back up because old one was trashed.
 
Ok, you got spark...onto carbs
If you didn't either dip the carbs or use a ultrasonic cleaner before blowing air at them, you likely have forced crud into the tiny passages that the idle circuit uses to supply mixture to carb throats. Tooling around your neighborhood, you'll be running mostly on these idle circuits...if some pipes aren't hot, their cylinders are probably starved.
 
I’ll pulled the carbs off again and recheck everything. Would not having the air box on the bike cause this issue? I didn’t put them on as I was just testing the bike to see if it would run.
 
baesorenson said:
I’ve rebuilt the carbs with new jets ...
Click to expand...
Hopefully you did a bit more than just slap some new jets in there. And, hopefully you did not use the jets out of a "rebuild kit". Too many times, those jets are of questionable quality. It's better to clean and re-use the original jets.


baesorenson said:
Would not having the air box on the bike cause this issue? I didn’t put them on as I was just testing the bike to see if it would run.
Click to expand...
The bike will start and idle without the airbox, but don't expect any throttle respose to get above idle speeds. The part that scares me is "them" when you are referring to the airbox. Do you actually have the stock airbox or are you using individual pod filters? Yes, it makes a difference, as pods will require different jetting.

.
 
I went to Suzuki Dealer and he said K&L jets are same as stock. Which the sizes were the same. Wouldn't understand why 2 carbs would work and other 2 won't...

Yes bike idles fine and boggs with power over 3k rpm. Not trying use power. I just let it idle to see if all are firing. I refurbished airbox with weatherstripping and new Uni foam filter. I should have said "IT". Sorry, I am not using pods.

I should have done a compression check before taking valve cover off to inspect valve clearance. Now I have to get new gasket before next turn over. But with my valve clearance measurements still doesn't make sense why 1 and 4 aren't firing... Coil reads within spec, Spark plug is sparking, Intake Valve clearances on all 4 are within spec. Only cylinder 3 and 4 exhaust valve could use adjusting. Leaves me thinking i just need to put valve cover back on and do a compression check. If 1 and 4 is low then may need new rings. If compression is good then nothing to do but pull carbs off again and re clean and install I guess..
 
yes everything is new in carb except diaphragm and needle which were in good condition and cleaned.
 
While you're messing with stuff,make sure floats are not hanging up in bowl ...some bowl gaskets can cause sticking.
 
You must log in or register to reply here.

Similar threads

dubwicht
1979 GS1000L Spark but not firing on Cylinders 3 and 4
Replies
5
Views
149
dubwicht
dubwicht
peteGSX
1982 GS450 - No Spark
Replies
12
Views
213
peteGSX
peteGSX
K
Sparks, Zats, Ignition Coils, and Gas Mileage
Replies
4
Views
156
kemp
K
D
No Spark on 2 and 3! Frustrating as can be.
Replies
7
Views
197
pdqford
P
dandypop
GS850G Won't Start, Electrical Issue, No Spark
2 3
Replies
54
Views
859
dandypop
dandypop
Back
Top