Author Topic: I hate my bike, who wants to buy it? (Read 8770 times)

VTCBike750 · « **Reply #25 on:** October 10, 2011, 03:38:18 PM »

You got this man, glad to hear you got some motivation. Ive sold one CB and regretted it since. If I can figure these things out I'm sure you can too. Hey winters coming, got to have something to do. And didnt you say your kids are going off to college soon? You'll have plenty of time then

Quote from: TwoTired on October 10, 2011, 11:48:18 AM

Has the gas tank vent been checked?

I dont know anything about the Dyna. Could be the issue. I know that some of your symptoms sound like fuel starvation, mine happened to occur only on reserve.

The gas cap has a small vent hole to prevent vacuum pressure from inhibiting gas flow. My tank was once kreemed and had inadvertently gotten some kreem in the cap when removing it with acetone. It is unbelievably easy to clean the cap.
http://forums.sohc4.net/index.php?topic=35056.0

Good Luck!

Duanob · « **Reply #26 on:** October 11, 2011, 11:35:25 AM »

How about a diagnosis before every one jumps on the anti-dyna bandwagon? I happen to be a big fan of electronic ignitions. I've been stranded more by points and condensors and moisture in the dizzy cap than any EI i've ever installed. Two cars, three boats and now a cycle. Never had a problem with any of them.

pknopp · « **Reply #27 on:** October 11, 2011, 12:25:56 PM »

Quote from: Duanob on October 11, 2011, 11:35:25 AM

How about a diagnosis before every one jumps on the anti-dyna bandwagon? I happen to be a big fan of electronic ignitions. I've been stranded more by points and condensors and moisture in the dizzy cap than any EI i've ever installed. Two cars, three boats and now a cycle. Never had a problem with any of them.

I really don't care what people prefer. If it works for you, great. I'll just note that all of those are quick easy fixes on the side of the road.

faux fiddy · « **Reply #28 on:** October 11, 2011, 01:03:46 PM »

Quote from: Gordon on October 10, 2011, 09:21:19 AM

as mine have given me endless amounts good times in the form of both joy and frustration

And of course the true joy is understanding and finally fixing the problem. Done it with a dead toyota van, read the trouble codes (couldn't find "6-6-6" in the manual) replaced igniters, computer, plugs, cap , wires, followed the troubleshooting procedure a dozen times, tested or replaced every component and just before spending another $300 on a new distributor I put a small chip of wood in it to close the gap in the CDI pickup a bit. Immediately had spark and a good runner.

The manufacturer made it a runner- and there is a certain self satisfaction gained from figuring out what to do to to fix no-go problem.

The other option is modern and plastic looking.

jgmmgood · « **Reply #29 on:** October 11, 2011, 01:18:16 PM »

Kind of agree with Kirkn from page 1.
Although if the 2-3 are cold, this could point (no pun intended) to ignition circuit, but the blown baffle may not be coincidental.
I am thinking if 2-3 are not firing, they will still build up fuel/vapor to the possible point of hyper-explosivitity ratio when 2-3 decides to spark and Blammo, fireball.
Had a similar situation on an old '69 Roadrunner years ago.
Just my 2c....

Eydugstr · « **Reply #30 on:** October 11, 2011, 02:25:23 PM »

Bluezboy - Sounds like you've had a "(*&%$ker moment, and sorry to hear all you went through. (Still) have an old Suzuki X6 that gave me several of those "professionally serviced" moments.

If it's any consolation... There's nothing on that bike that can't be fixed. And after watching prices of CB750's jump considerably over the years...Might be a good idea to hang onto it, even if just to sell later on.

Spanner 1 · « **Reply #31 on:** October 11, 2011, 07:54:24 PM »

Vern, your problem is not your carbs, not your Dyna ignition but your charging system !
Your bike is 'prolly only producing 10 or 11 volts of charge due to 1 or 2 diodes in the rectifier ( it has 6 ) gone bad..... the Dyna will shut down , 2 cyls first when the voltage drops below a level to keep it firing ( keep in mind it needs more power to run it, no prob. normally)....... The charging system just can't keep up with the headlight and ignition and the battery voltage will drop slowly ( might take 50 miles ) before your under the voltage that the Dyna can work at.... I'd about bet my shirt on this being the problem

.... a rectifier and clean, clean, clean those 'block' connectors.. fuseholders too while your at it . I mean shiny 'see your face in it ' clean

... Wrench Fest, what a great idea.

mattcoff1 · « **Reply #32 on:** October 11, 2011, 08:30:33 PM »

I got to agree with spanner 1 I had problems like your having on my 750... turned out to be low 9 volts at coils/ignition circuit alternator was charging fine just an old 30 years plus wiring harness i ran a seperate new circuit to my ignition system,batt to fuseto relay to switch to ignition...no more problems. so fault trace the basics first before random part swapping...
Just my 2 cents

Matt

faux fiddy · « **Reply #33 on:** October 12, 2011, 12:25:39 AM »

Quote from: mattcoff1 on October 11, 2011, 08:30:33 PM

I got to agree with spanner 1 I had problems like your having on my 750... turned out to be low 9 volts at coils/ignition circuit alternator was charging fine just an old 30 years plus wiring harness i ran a seperate new circuit to my ignition system,batt to fuseto relay to switch to ignition...no more problems. so fault trace the basics first before random part swapping...
Just my 2 cents

Matt

+1

As with anything temporarily lost, it wil be the last place you look.

bluezboy · « **Reply #34 on:** October 12, 2011, 05:58:17 AM »

Spanner, what you said makes sense, but Travis did check my voltage for me on Saturday evening after I'd had trouble starting it that morning and he said was charging fine. Actually, he had me turn the regulator down a touch because charging too high. I can't remember if the lights were on though. The regulator and the recitfier are from Oregon Motorcycle Parts, installed one year ago. The wiring harness is also one year old. l'll go out and the voltage and the fuse holders later today. Stay tuned. Vern

Trav-i · « **Reply #35 on:** October 12, 2011, 07:24:30 AM »

Guys I checked the cheraging system while Vern was at Barber with us. The first time I checked it, it was charging almost 15 volts. I actually had him turn it down some to keep the battery from getting fried. I'm still willing to put my money on his dyna, when it was cold or cool it ran great but when it's hot all the problems come out. I have noticed serveral others with the same problem, most changed their dyna with either points or a new dyna and the problem went away. I'm still running 32 year old coils with 32 year old points and have had NO problems, I see no reason to run anything else.

shino · « **Reply #36 on:** October 12, 2011, 07:26:54 AM »

Might be your ignition coils going bad. happened to mine 2 years ago. Changed everything from points, to rectifiers, wiring, condensers, even the battery. It all boiled down to the freaking ignition coils....

bluezboy · « **Reply #37 on:** October 12, 2011, 08:00:03 AM »

The dyna coils and spark plug wires are also 1 year old, fresh spark plugs were installed 4 weeks ago.

MCRider · « **Reply #38 on:** October 12, 2011, 08:08:23 AM »

Quote from: bluezboy on October 12, 2011, 08:00:03 AM

The Dyna coils and spark plug wires are also 1 year old, fresh spark plugs were installed 4 weeks ago.

Unfortunately, low age doesn't disqualify them (coils mostly, not so much wires and plugs) from suspicion. They'll need to be replaced to confirm or deny they are good.

Since I don't think you can mix and match the Dyna Coils/Ignition with OEM, that's why I say get a OEM coil/point set up. I guess you'll be swapping out wires too with the stock setup.

I'm not so good at testing. And testing doesn't work if the problem is intermittent or caused by operating heat.

If the part(s) is available I prefer swapping them out. Other people have raised very good points about the charging system and other things. So they need to be confirmed as well. But I still suspect something in the DYNA coil/ignition combo.

Artf0rm · « **Reply #39 on:** October 12, 2011, 09:28:28 AM »

I will say this. If it turns out to be the Dyna I would give them a call before you go out ans spend money on any sort of replacement. They really stand by there stuff. Chances are if your even remotely near your warranty period they will diagnose your part issue and replace the faulty components.

MCRider · « **Reply #40 on:** October 12, 2011, 09:40:44 AM »

Quote from: Artf0rm on October 12, 2011, 09:28:28 AM

I will say this. If it turns out to be the Dyna I would give them a call before you go out ans spend money on any sort of replacement. They really stand by there stuff. Chances are if your even remotely near your warranty period they will diagnose your part issue and replace the faulty components.

Good point. Of those I've read here (just a few) memory is that Dyna replaced them even when out of warranty.

bluezboy · « **Reply #41 on:** October 12, 2011, 09:44:08 AM »

If it's faulty, I hope they will replace it, that thing was not cheap. Just tested the charging system again and it it read fine,but of course that doesn't mean much since the problem occurs while actually riding it after 40 or so miles. Stay tuned!

Damfino · « **Reply #42 on:** October 12, 2011, 10:05:04 AM »

'Hate' is such a harsh word. Can't we just talk you into 'disliking' your bike for awhile Vern?

bluezboy · « **Reply #43 on:** October 12, 2011, 10:09:33 AM »

How's that?

Damfino · « **Reply #44 on:** October 12, 2011, 10:22:22 AM »

Quote from: bluezboy on October 12, 2011, 10:09:33 AM

How's that?

I was referring to the title of your thread.

Edit: I see you got it!

lrutt · « **Reply #45 on:** October 14, 2011, 05:39:05 AM »

Quote from: bluezboy on October 10, 2011, 07:33:51 AM

Great point and I did just get an offer from a fellow CB friend and mechanic to take a look at it, so I will take him up on his kind offer. So far, the leading opinion is the main problem may be the Dyna igniton and coils that are only a year old and cost me some change! I 'd hate to think that's money down the drain, but who knows.

ding ding ding.. Points will ALWAYS get you home. My son did the same thing against my recommendations, put electronics ignition and regulation on his bike and it's been sitting every since. Just won't run right. I'll be visiting him in November and will be taking my points plate with me to verify what the problem is.

Not the bikes fault that you tried to 'improve' it. Take her back to stock and enjoy what these old gals have to offer.

70CB750 · « **Reply #46 on:** October 14, 2011, 05:51:04 AM »

Quote from: shino on October 12, 2011, 07:26:54 AM

Might be your ignition coils going bad. happened to mine 2 years ago. Changed everything from points, to rectifiers, wiring, condensers, even the battery. It all boiled down to the freaking ignition coils....

Coils going bad can be very hard to find. It starts fine, but when the coil gets hot, it will stop firing.

I would first park the bike for a week or two - does not hurt to take a break - than start working on it, keep records, observing. There are jinxed vehicles out there, I am sure, but it could be something easy and simple in your case.

bluezboy · « **Reply #47 on:** October 14, 2011, 06:41:36 AM »

Quote from: 70CB750 on October 14, 2011, 05:51:04 AM

Quote from: shino on October 12, 2011, 07:26:54 AM
Might be your ignition coils going bad. happened to mine 2 years ago. Changed everything from points, to rectifiers, wiring, condensers, even the battery. It all boiled down to the freaking ignition coils....

Coils going bad can be very hard to find. It starts fine, but when the coil gets hot, it will stop firing.

I would first park the bike for a week or two - does not hurt to take a break - than start working on it, keep records, observing. There are jinxed vehicles out there, I am sure, but it could be something easy and simple in your case.

Since my last episode with this bike I'm pretty convinced it is jixed and it pisses me off to wonder if one of the many new, and not cheap parts that were replaced may be screwed up. I have to admit dumping that year old dyna seems like I would be tossing out the baby with the bath water, but the suggestion to go back to points may be what I should do.

kirkn · « **Reply #48 on:** October 14, 2011, 07:22:47 AM »

"jinxed" "pissed off" "dumping" "wondering" "convinced"

Jeez, you're sure approaching this in an emotional, flaky manner. It's a piece of machinery fer cryin' out loud!! Get a mechanic with a few instruments (meter, etc), do some basic troubleshooting, find and fix the problem, complain to Dyna if that's what the issue is and quit whining about "jinxed" and other mystic psychobabble!!

*off soapbox*

MCRider · « **Reply #49 on:** October 14, 2011, 07:33:09 AM »

Its not an issue of "dumping the dyna". The issue is troubleshooting it by process of elimination. Put the OEM ignition on it and see if it runs OK. If it still acts up, put the Dyna back in and try something else. If it doesn't act up, contact Dyna's tech/warranty dept and proceed with replacement.

This stuff happens to all of us at one time or another.

News:

Author Topic: I hate my bike, who wants to buy it? (Read 8770 times)