Author Topic: Im lost need advice. Bogging after a 20 min ride. (Read 3546 times)

Beans · « **on:** September 17, 2009, 02:14:23 PM »

OK so I changed my plugs and gaped them to .28 like the book says. went for a ride and after 20 min of riding it cuts out and sounds like its running on 3 cylinders. take it home check the plugs everything looks to be OK. put the plugs back in and it runs fine like it supposed to. go for another ride to make sure everything is OK and it does it again after 20 min. can anyone give me a clue as to whats going on. I thought it would have been my points but come to find out I have a Dyna ignition. sweet on my end for a free bike. but now I'm lost. I'm thinking maybe I'm running to lean need to richen it out. plugs seem to be tan in color but number 2 being a little on the white side compared to the rest. I'm lost I need to ride the bike to the insurance company today but think I will have to trailer it if I can't get it fixed. Hope you guy can help me out.

Gordon · « **Reply #1 on:** September 17, 2009, 02:26:13 PM »

When this happens again, pop open the gas cap and see if it starts running better. If so you have a blocked cap vent.

Beans · « **Reply #2 on:** September 17, 2009, 04:56:31 PM »

Ill try that out. I just think its weired since it drove fine for a few months and now all of a sudden this is happening. I'm lost since I just cooled the motor down hit the start button and now it runs fine. I'm thinking maybe the breather like u said on the tank is clogged. Or not getting enough fuel.

Beans · « **Reply #3 on:** September 17, 2009, 07:12:33 PM »

Ok so cooled off the bike. Runs fine went for a ride and it did it again. Opend the fillr cap and no changes so its not that. I'm kinda wondering if my coils are bad? Or my dyna ignition might be messed up when the motor warms up.

Does anyone know how to check the dyna ignition to see if its bad? I get spark so don't realy think that's it but I don't know what elese to check. Maybe I need to rejet the bike a little richer? Doesn't make since since it ran fine for months and now its bad.

Retro Rocket · « **Reply #4 on:** September 17, 2009, 07:18:38 PM »

Someone else recently had a similar problem and it turned out to be a dodgey coil.

Mick

Beans · « **Reply #5 on:** September 17, 2009, 07:22:20 PM »

I got another coil so I might switch it out and see if thats the problem then go from their. im just lost because I want to ride the bike but not if it keeps doing this after 20 min.

Simpson · « **Reply #6 on:** September 17, 2009, 07:22:53 PM »

Undo the last step you made with the spark plugs and see if that fixes the issue. Put your old spark plus back in. I have purchased many NGK plugs that fire weak/intermittent after getting hot.

I'm guessing it ran fine before the plug change.

Beans · « **Reply #7 on:** September 17, 2009, 07:28:02 PM »

it ran fine and then all of a sudden sounded like it was running on 3 cylinders so I thought maybe I fouled a plug. changed them and it still did it after riding for 20 min. going to change the coils and see if that helps. hopefully the spare set I have are not bad.

w1sa · « **Reply #8 on:** September 17, 2009, 07:48:53 PM »

It could be the float heights and/or a sticking or ubstructed float valve/ needle?
If the coil and plugs are OK, maybe the fuel flow into bowls is not sufficient for sustained driving or higher throttle applications...........

Beans · « **Reply #9 on:** September 17, 2009, 07:50:52 PM »

Quote from: w1sa on September 17, 2009, 07:48:53 PM

It could be the float heights and/or a sticking or ubstructed float valve/ needle?
If the coil and plugs are OK, maybe the fuel flow into bowls is not sufficient for sustained driving or higher throttle applications...........

that is making since. maybe I will try that before changing the coils since I can take the carbs out before removing the gas tank. I just want to get it fixed so I can ride it more before winter comes.

Retro Rocket · « **Reply #10 on:** September 17, 2009, 08:03:27 PM »

Quote from: Beans on September 17, 2009, 07:50:52 PM

Quote from: w1sa on September 17, 2009, 07:48:53 PM
It could be the float heights and/or a sticking or ubstructed float valve/ needle?
If the coil and plugs are OK, maybe the fuel flow into bowls is not sufficient for sustained driving or higher throttle applications...........

that is making since. maybe I will try that before changing the coils since I can take the carbs out before removing the gas tank. I just want to get it fixed so I can ride it more before winter comes.

I'm pretty sure if the floats were the problem it would show up almost immediately, not after 20 minutes of riding.

http://forums.sohc4.net/index.php?topic=57862.0

Have a look at this thread and see if there are any similarities..

Mick

Spanner 1 · « **Reply #11 on:** September 17, 2009, 08:13:51 PM »

Slow fuel delivery...what is the bike ??.....1 or 2 fuel lines from tank?.......I think your petcock is blocked with rust/ gunk and only allowing a trickle of gas thru'...happened to my K1 , just the same symtoms . Of course, when you stop the carbs have time to fill, so starts o.k. but gas supply can't keep-up with 'demand'....

Beans · « **Reply #12 on:** September 17, 2009, 08:20:12 PM »

could have a clocked petcock but not sure. will probably check that out here soon. well back to the garage to see whats up.

Spanner 1 · « **Reply #13 on:** September 17, 2009, 08:30:11 PM »

Right-hand petcock with 2 fuel lines or left-hand petcock with 1 line and splitter.....
What bike ?

Footnote; Sure would be nice if everyone listed their bike(s) under their avatar space !

Beans · « **Reply #14 on:** September 17, 2009, 10:08:12 PM »

Sorry its a 75 cb550f with right side petcock dual spout. Took the petcock out filter looks clean and it flows good so now I'm leaning tords coils.

bender01 · « **Reply #15 on:** September 17, 2009, 10:32:57 PM »

Have you taken the plug boots off and given them a turn or two to see if they are tight into the plug wires? This has happened to me recently. Are the headers all hot or is one much cooler?

Beans · « **Reply #16 on:** September 17, 2009, 10:51:24 PM »

Ok checked the end of the spark plug wired and 2 where loose. Didn't think to check to see if the header was hot on each cylinder. I will do more test tomorrow if this loose wires didn't fix it.

SiliconDoc · « **Reply #17 on:** September 18, 2009, 01:37:03 AM »

Quote from: Beans on September 17, 2009, 10:51:24 PM

Ok checked the end of the spark plug wired and 2 where loose. Didn't think to check to see if the header was hot on each cylinder. I will do more test tomorrow if this loose wires didn't fix it.

If that doesn't fix it, it is a heat related problem, so a shorting coil when hot is a good place to look, or an air leak (boots to intake) that developes after the bike is warm.

Buber · « **Reply #18 on:** September 18, 2009, 02:54:44 AM »

I had something very similar on my CB650. only that 2 cylinders went out. If I read you correctly you have a dyna ignition. Does it have impulsators as pick up, not the standard points? If yes, then it's one of them. If not do another test. Start bike from cold and don't drive it, just let it heat up on idle. If it happens again, then it's temp related issue, and the means 99% electronics ignition system somewhere. Good luck in searching for it. I'm positive it's some heating up ignition component (may be a connection somewhere on ignition too).

Beans · « **Reply #19 on:** September 18, 2009, 08:33:40 AM »

Yes impulse no points. I'm thinking it could be bad plug wire ends. Since they where loos and when heating up wasn't giving it enough spark. Going to try and change the ends and see how that goes. If that doesn't work then its fiding the sproblem in the wireing.

Beans · « **Reply #20 on:** September 18, 2009, 08:14:07 PM »

ok ran bike it happens again change coil and its still doing it. my question is now when I start the bike to check spark on the coil the start assembly shocks me. when I hit the start button or even kill the bike when its running. could it be that thats bad and giving the ignition a bad connection when warm? im also going to try and see if carb boots and air leak might be doing it as well.

Simpson · « **Reply #21 on:** September 18, 2009, 08:56:02 PM »

Quote from: Beans on September 18, 2009, 08:14:07 PM

my question is now when I start the bike to check spark on the coil the start assembly shocks me. when I hit the start button or even kill the bike when its running.

Could you describe this in better detail?
What is the "start assembly"? (Start button on the controls)?

Beans · « **Reply #22 on:** September 18, 2009, 09:17:34 PM »

yes the start button and kill switch on the controls.

Simpson · « **Reply #23 on:** September 18, 2009, 09:33:44 PM »

You are feeling shocks from your controls on the handle bars?

If so, that's certainly a problem!
You have something grounding out on the housing.

Beans · « **Reply #24 on:** September 18, 2009, 10:05:59 PM »

Ok figured out why it was shocking me ground was not hooked up and so everytime I would pus the button I was seeing if it a green wire as ground. Still lost though been running the bike for 15 min and nothing so far. Runs good. Maybe it was a bad could idk.

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Author Topic: Im lost need advice. Bogging after a 20 min ride. (Read 3546 times)

SiliconDoc