Kawasaki VN750 Forum banner

1 - 14 of 14 Posts

·
Newb with a Bullet!
Joined
·
589 Posts
Discussion Starter #1
Still fighting w/ my bike. It's been good for a ride or two and then back to hesitating. Am planning on revisiting the whole jetting thing, but I'm wondering if it could be something else altogether, something intermittent.

Today on the way home from lunch I was going along fine when one cylinder just DIED. No sound out that side, power cut in half, and as soon as I pulled in the clutch the other died. I thought I was stranded. I waited a minute and then tried to start it. It cranked and cranked. It did not start. I put the choke full on and it started to sputter. I kept cranking and it started and ran fine again?!

Then in the way back to work it did about the same thing, killing at a stoplight. This time it started back up again w/out putting the choke on.

Seriously, what the heck? I know my spark plugs and wires are good. I think my CDI is OK. My carbs and petcock are clean. The jets and a/f screw may need tweaking, but one whole cylinder should not be dying!

Are the coils the same or is there a front and rear one? I have half a mind to get another one and put it in for the one on the jug that died (front cylinder) and just see if it stays the same.

But anyway, what would my symptoms be if my coils were failing or intermittent? What else could it be, still?

I have to be honest, with the 1500 sitting there looking glorious I'm starting to have thoughts of parting out my 750 to fund it. I'm not ready to give up yet, but I'm formulating a backup plan, that's for sure!
 

·
Premium Member
Joined
·
3,505 Posts
That sounds more like the CDI unit is acting up - didn't you just put in a new one? You may also want to check the pick-up coils (inside the smaller left side engine cover) - but I'd be more suspicous of the CDI.
 

·
Newb with a Bullet!
Joined
·
589 Posts
Discussion Starter #3
That sounds more like the CDI unit is acting up - didn't you just put in a new one? You may also want to check the pick-up coils (inside the smaller left side engine cover) - but I'd be more suspicous of the CDI.
Nope, went to put in my aftermarket CDI and found I did not have the correct harness. Gypsy is sending it. So I'm still on the stocker.

What do I want to check about the pickup coils? Is there a visual test?
 

·
Newb with a Bullet!
Joined
·
589 Posts
Discussion Starter #4
OK, it just died on me on the way home in the exact same spot.

My plan.

Dump my white tank. It is a VN700 w/out the vent tube. I don't think this is all phantom out of gas, but going to minimize that possibility. I have three other tanks. I'm switching to one.

Going to put the Jardine pipes on and get the intake/exhaust where it's going to be.

Put on the Dyna when the harness gets here. Will put it at the stock curve to begin with.

Going to pull the carbs and set the jetting to Lance's suggestions for jetting.

Then will test and tweak the jetting according to the instructions I've found researching my '95 1500.

If it doesn't run like a top after all that, I don't know what it could be besides the coils. May replace them to be sure. May give up and part her out.

I'm sure I can get $1000 for the cavalcade of parts I have laying around, maybe even $1500 making it a trade for the $1500.

I know it will feel GREAT if I conquer it, but right now I feel like I'm getting licked.
 

·
Undercover Sportbiker
Joined
·
1,097 Posts
If you end up needing coils, I have 3 I could sell ya cheap which were all working fine when my bike moved on to the next life.
 

·
Newb with a Bullet!
Joined
·
589 Posts
Discussion Starter #6
How cheap is cheap? Are they both the same or are there front and rear? I'm interested in getting them on hand so they are ready to go in if there continues to be a problem. Shoot me a PM w/ the details and we'll get the turkeys talking!

Got anything else I might need? Stock CDI even? If I could A/B it with mine and that fixes it I know to hit mine with a hammer!

If you end up needing coils, I have 3 I could sell ya cheap which were all working fine when my bike moved on to the next life.
 

·
Registered
Joined
·
659 Posts
We just replaced the front and rear coils/plug wires on my buddy's 750 last night, hoping to correct a similar "dying without warning" problem. His usually starts right up again, and it seems to only happen when the bike is in the process of warming up, 5 or 10 minutes into a ride.

They are different because the front one has one long plug wire to reach the right side plug. The rear wires are equal length. The front one is no problem. The rear is a bit of a bitch. Take the battery out, then once it is loose, turn it 45 degrees so the coil is verticle, and there is just enough room to slip it out the top between the frame and the battery box.
 

·
Newb with a Bullet!
Joined
·
589 Posts
Discussion Starter #8
I already put on new plug wires. The coils themselves are both the same then I take it? I saw the wires were diff lengths and replaced them carefully w/ the matching ones in my new set.

Did it solve the problem when you did the swap?
 

·
Sparky!!!
Joined
·
8,697 Posts
this problem you speak of sounds more like an ignition switch problem than a coil problem
the CDI and Coils either work or don't. No somtimes maybee... so i would check the ignition sitch, and make sure the wires on the coil primaries are tight
 

·
Undercover Sportbiker
Joined
·
1,097 Posts
I'll check if I still have the CDI, but the coils themselves are the same. Let me double check if I still have them in my parts box and I'll get back to you.
 

·
Registered
Joined
·
659 Posts
I already put on new plug wires. The coils themselves are both the same then I take it? I saw the wires were diff lengths and replaced them carefully w/ the matching ones in my new set.

Did it solve the problem when you did the swap?
Yes, so far so good. He em'd me this AM to say it was running like a dream. It better! We are taking our wives on a trip this weekend.
 

·
Registered
Joined
·
75 Posts
When it fails, which cylinder goes dead? If it's the front cylinder doesn't the front coil operate the tach? Has there been any work on the tach or behind the headlight where a wire could have gotten pinched?
 

·
Newb with a Bullet!
Joined
·
589 Posts
Discussion Starter #13
Front cylinder died the time I was sure one did. The other two times I wasn't sure if they both died at the same time. Tach and such hasn't been messed with any time recently.
 

·
Premium Member
Joined
·
3,505 Posts
It could be the pick-up coils rather than the ignition coils. I have a set of pick-ups that I pulled off an '85. If you want, I can send them to you to test out - if they work, we can come up with a fair price (what's it worth to ya to have the '92 running? lol). If that's not the problem, you can send them back and I'll save 'em for someone else.
 
1 - 14 of 14 Posts
Top