Suzuki GSX-R Motorcycle Forums Gixxer.com banner
Cancel
Create thread New Forums

Friends Bandit 600, Need some direction

Jump to Latest
1 - 20 of 20 Posts

Nemisus

· Premium Member
Joined
·
90 Posts
Discussion starter · #1 ·
So I'm not sure where to put this, but I need some help.

A friend of mine picked up a 2000 Bandit 600. Previous owner said it sat for over a year.

When we got it home it ran poor.. Very underpowered. First thing I did was was fresh gas and a set of basic carb kits.

Bike runs about the same as before. What really throws me is this,

I was looking around trying to see if anything was out of place and I bumped my arm on the #4 header pipe coming out of the head. Bike had been running for 5 mins or more. Pipe was COLD! :dunno
tapped numbers 3 and 2 and they were HOT... number 1 was also COLD.

Checked spark on 1 and 4 and both fire correctly.

Here something else that trips me out..... just for shits and giggles I pulled the wires for 2 and 3..... started and now 1 and 4 work.... it will only idle with the choke on but they both fire. :suicide

While running on 1 and 4 I re-attatched 2... NO change, than 3, and the bike idled up to about 4k.. I take the choke off, idles ok.. take it for a ride around the block, get off and 1 and 4's header pipes are COLD.... :scratch

Anyone got any idea why all four cylinders wont run together?

Is this carburetor related or ignition related?

Just for good measure tomorrow I will changed the plugs... they are due regardless

Thanks in advance.

Cheers

Nem
 
#2 ·
Very strange.

Won't be carb or fuel related, they would both be operating the same with the wires on or off.

Does the Bandit have a single coil? Just wondering if it does might it be getting weak and not able to send the spark to 4 plugs. :dunno
 
#3 ·
Knight2211 said:
Very strange.

Won't be carb or fuel related, they would both be operating the same with the wires on or off.

Does the Bandit have a single coil? Just wondering if it does might it be getting weak and not able to send the spark to 4 plugs. :dunno
Click to expand...

IIRC, it's got two coils.
I'd guess there's a problem with one of the two coils.
 
#5 · (Edited)
You likely have a bad coil, or loose connections going to it.
Ensure that you have 12v going to that coil.

Usually Left coil fires cylinders 1 + 4, Right coil fires 2 + 3.
If there are no loose connections, you need to run a coil test.

Primary Test:
-Get a digital voltmeter, set it Ohms( Ω )
-Locate the + and - , on the back of the Coils
-Touch the Voltmeter Leads to them
-It should read 2.5 - 3.8 Ohms.
(it doesn't matter which Leads go to + or -, just make sure the bike is OFF)

Secondary Test:
-Locate the coil that runs to cylinder 1 + 4.(which you already have)
-Pull both of the sparkplug-caps off of the spark plugs, on 1 and 4
-Stick the voltmeter Leads into both of these plug caps.
(one Lead into each of them, it doesn't matter which cap Red or Black goes into)
-Now...you should get between 30-50k Ohms, according to specs.
 
Discussion starter · #6 ·
it has two coils.

What about what controls the coils? Rectifier maybe? Thanks for the Testing Methods Red_bandit... I'll try this today and see what I get


Thanks for the help... this one has really stumped me.

Cheers

Nem
 
Discussion starter · #7 ·
Ok so I just went out and started the bike,

Started right up first crank....Let it warm up and now this time 1 2 and 3 are firing.... header pips hot after a few mintues... but number 4 pipe is still very cold after a few mintues...
 
#8 ·
Nemisus said:
Ok so I just went out and started the bike,

Started right up first crank....Let it warm up and now this time 1 2 and 3 are firing.... header pips hot after a few mintues... but number 4 pipe is still very cold after a few mintues...
Click to expand...

All the plug wires secure at the coils.
Sounds like a bad/damaged wire or a loose connection at the coil?
Did you do the voltage test?
 
Discussion starter · #11 ·
found my meter.. gonna go out and try and trouble shoot these coils...

palat_I

its an excellent idea.. but why would 1 and 4 work when 2 and 3 were disconnected? Wouldn't a gummed up jet be consistantly gummed?
 
#12 ·
Nemisus said:
found my meter.. gonna go out and try and trouble shoot these coils...

palat_I

its an excellent idea.. but why would 1 and 4 work when 2 and 3 were disconnected? Wouldn't a gummed up jet be consistantly gummed?
Click to expand...
Yep, the L/H coil is shot.
 
Save
Reply Quote Like Like
Discussion starter · #13 ·
Primary test on the + and - of both coils and they are both at 3.0 ohms.

Secondary test on plug caps:

1-4 coil reads .232 (<--- NOT a misprint )
2-3 coil reads 35.0 k

with those posted above numbers I'm going to say I have faulty plug wires?
 
Discussion starter · #16 ·
picked up a used Coil that gives the correct ohm readings, but the bike still wont fire on all four.... At least from what I can tell.. 1 and 4 header pipes are cool..

however if I pull 2 and 3 they will fire...

Anyone think the pick up coil is to blame?

And how about the igniter? I read in the Suzuki manual that there is a rev limiter built into the igniter that if 12k rpms is reached without load it will kill the ignition spark to 1 and 4... perhaps the igniter is faulty and always thinking the bike is over 12k rpm's?

I'm reaching out now, but I really don't know what else to do....

thanks
 
#18 · (Edited)
Why is this sounding more and more like engine timing to me....
I'm also thinking about bad Ignitor, but usually they cause misfires on all cylinders?

I had a 750, which started to do almost exactly the same thing. It was a points ignition bike though.
Turns out, the timing went extremely retarded, literally, lol.


What about your battery, it should have 12.6 Off, and 13.4v Idling, and 14+ as you Rev engine.
(I know this seems stupid and obvious, but if your charging system is failing, you Can absolutely get all kinds of weird symptoms occurring.)
 
Discussion starter · #19 ·
I was only thinking about the ignitor because of the function that controls the rev limiter. In the suzuki manual it specifially states that this funtion kills ignition spark to 1-4 cylinders when 12k rps is reach without load. I was curious if that fuction was faulty and continuiously thinking the bike was over 12k rps...?

As for timing.. what part of this bike controls timing? Signal Generator and pick up coil?

I wasn't able to test max voltage on the signal generator because I do not have a max voltage adaptor for my voltage meter...... So right now I'm kind of stuck with guessing.
 
#20 ·
Nemisus said:
found my meter.. gonna go out and try and trouble shoot these coils...

palat_I

its an excellent idea.. but why would 1 and 4 work when 2 and 3 were disconnected? Wouldn't a gummed up jet be consistantly gummed?
Click to expand...
good point...i just remembered how bad the carbs on my old yamaha got when it sat for only a few months
 
Save
Reply Quote Like Like
1 - 20 of 20 Posts
About this Discussion
19 Replies
6 Participants
Last post:
palat_l
Suzuki GSX-R Motorcycle Forums Gixxer.com
posts
6.5M
members
249K
Since
2000
A forum community dedicated to the Suzuki GSX-R motorcycle. Discuss the GSX-R600, GSX-R750, GSX-R1000, and GSX-R1100, and more!
Full Forum Listing
Explore Our Forums
General Bike Talk 06-07 GSX-R600/750 GSX-R1000 General Forum Photos & Videos The Original Farm