fuel, overheat or flooding issue??? No power loss then the engine dies.

Found this on Partzill.com -

This Honda 30300-ML7-003 GENERATOR, PULSE is used on these models and components:

1986 VFR700F A PULSE GENERATOR
1986 VFR700F AC PULSE GENERATOR
1986 VFR700F2 A PULSE GENERATOR
1986 VFR700F2 AC PULSE GENERATOR
1986 VFR750F A PULSE GENERATOR + STARTER CLUTCH
1986 VFR750F AC PULSE GENERATOR + STARTER CLUTCH


Edit: Just had a thought. If this whole thing is due to heat build up can't you just add some heat resistant material around it? Or is it more internal heat inside the generator causing the problems...

 

So whoever had this before me did something with the fuel pump wiring. Took the dark green and grounded it took the black and blue wire ( red in picture ) straight to the wires on the right hand grip ( 2nd pic ) and stuck a #10 fuse in there... any thoughts? Doesn't seem right to me...

 

From what I can tell they used the front brake light switch to power the pump. Does that make any sense???

 

So it's definitely the coils. Ran it around the block a few times and pulled into the driveway, revved it once and she died. Pulled a plug lead and no spark on either side... 2 hours later, started right up. Now for the big question. How can I tell if it's the Pulse Generator or the leads that are heating up and causing the problem..... At this pace, I MIGHT have it ready by next spring.

 

Glad to see you're getting closer, perseverance FTW! Aren't old machines just great? Coils for our bikes are dirt cheap on eBay, but I haven't ever been able to find any Pulse Generators. I went to a motorcycle salvage blowout sale at a local dealer this past weekend with them in mind but they had nothing for 2nd gens.

 

MPH Racing, I'm wondering if you have an aftermarket pump fitted and it is pumping too much pressure and the float needles can't hold it back

 

I actually managed to source a new fairing stay I needed along with new coils and a pulse gen. from an '87 F750 from the UK. Shipped and all for about $150. He's taking the PG off tomorrow to see if it matches what I need.

 

Thought about that, but it wouldn't explain no spark when she dies.

 

No spark when she dies is another ball game but didn't you say one pulse coil was dodgy even if this is the case it still should run on 2 cylinders?

 

Not positive but once hot she dies for an hour or two. Do you think it could just be too much fuel and it's flodding? No spark on the left or right bank when it happens.

 

Ok so it isn't coils,4 coils won't die at once, isn't pulse coils because they won't die at exactly the same time, not a fuel problem it is electrical something is getting hot and breaking contact, could be in the kill switch, ignition switch or maybe something in the ECU

 

So basically check and clean anything between the battery and spark plugs. Can do! Will update when I can.

 

Ok so thinking about it again, you said after the motor stops you had power to the coils but no spark, this rules out my kill switch/ignition switch theory because you wouldn't have power to the coils when the motor dies, as I said 4 coils won't stop working at once, neither will both pulse coils, this is sounding more like ECU unit unless somebody else has another idea. I seem to recall somebody repairing an ECU here recently

 

I just wanted to update everyone. I was having a similiar issue, dying when gets warmed up and not being able to start when it is warm. Well it looks like squirrelman pointed me in the right direction. I had checked my pulse generators and one of them was reading a really high resistance so I decided that had to be it. And it was!!!! Found a pair on ebay for $50, installed them last night and the bike runs like a top now. No more dying and not being able to start it again. Thanks for everyone's help.

 

I was hoping so! Where did you find them? I've been searching all over and can only come up with some out of the UK?

 

Well we have a little different bikes, there were about 5-6 available for mine on ebay. If you look on that partzilla.com website you linked earlier you should find the model # of the parts you need and then just search on that part number on ebay or on a specific bike you know will be compatible with yours and viola. It was really easy to change them out too, just used the existing brackets, screwed them on, attached the new oil pressure wire and plugged it in and it was good to go.

 

Sweet, thank you. Trust me Partzilla and me are on a first name basis already.

 

Okay so what you you guys think. I found a PG in the UK off of an '86 VFR750, but the mounting points look to be a bit different. Can anybody tell me if they think these two would be interchangeable and work on my '86 700?

 

Any thoughts on the compatibility on these? ^^^^^ see above ^^^^^

 

Holy hell I think I fixed it! 99 percent sure it was the pulse gen. The one I got from the UK off a VFR750F RC24 mounted right up. The only difference was the 700 had the two black pulse leads separate. The 750 hooks them together with a brace (see pic) the first time I put it back together I had messed up the timing. Had a spark but would not turn over. I had to take the cover off and move the timing wheel. It can only have 3 possible positions so I had a 50/50 shot to get it right. Well... I did! STARTED RIGHT UP!! Too late to test ride tonight with the kids home and the wife working, but I think we just got another 700F2 back on the road.