collapse

www.dimecitycycles.com


www.restocycle.com

www.CITYLIMITMOTO.com

www.jadusmotorcycleparts.com

www.bisonmotorsports.com

www.speedmotoco.com

www.cognitomoto.com

www.townmoto.com

www.sparckmoto.com

www.Moto-Madness.com

www.pistonsociety.com

www.steeltowngarage.com

QUESTIONS ABOUT THE SITE? TROUBLE REGISTERING? ADMIN@DOTHETON.COM

Author Topic: CB200 Misfiring 1 side when hot  (Read 565 times)

Offline advCo

  • DTT BOTM WINNER
  • *
  • Posts: 2202
  • Nick Ol' Eye
    • adventur Studios
CB200 Misfiring 1 side when hot
« on: Jul 25, 2017, 13:06:38 »
So we picked up a CB200T a couple weeks ago for Kayla to ride...I replaced the battery, cleaned the carbs and she's a runner.

The bike idles great and runs perfectly at low RPMs, I can take it for laps around the yard all day with no problems.

When I take it around the block and get it revved up to 5-6k, the left cylinder starts breaking up and misfiring. Once this happens, it'll just about stop running on that side until it cools down. I have had to walk it home a few times, but I can usually keep it running and get it home under its own power if I try hard enough. Then it starts back up like normal once its cooled down for a few minutes. The issue starts happening just about at the same point on every ride. I get about halfway around the block and it starts to misfire and bog, by the turn back onto my street it barely wants to stay running.

So I set out to do the necessary maintenance...set the cam chain tension, set all the valves to .002" as per FSM specs. After valve adjustments I took it for a run and ran into the same problem with same symptoms.

Checked the timing and it was a bit advanced. Adjusted the point gap and then timing and hoped it would solve the problem, but still experiencing the same issue. I also clipped the spark plug lead wire and made sure the cap had a good bite. In fact I tried a brand new NGK cap on the culprit side just to rule that out, same problem.

It really seems to me like a bad coil since it only does it when hot and then will start up again no problem after a few minutes resting. Odd thing is, this bike has a single coil with dual leads, so if it was the coil causing the problem I'd think that the problem would happen on both sides instead of just one (correct me if i'm wrong).

Next step is to double check the points to make sure they are clean. Maybe replace points and condenser before spending the cash on a coil?

"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline Hurco550

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 3017
  • Play Stupid Games, Win Stupid Prizes
Re: CB200 Misfiring 1 side when hot
« Reply #1 on: Jul 25, 2017, 13:12:29 »
Another thing I thought of after our last conversation, could it be the one lead coming out of the coil. I would imagine it's a wasted spark so a troubleshooting idea would be switching the spark plug wires and seeing if the problem persists only on the other side. Could be wrong though, but seems like an easy test if your leads are long enough

Sent from my SM-G900V using Tapatalk

Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline advCo

  • DTT BOTM WINNER
  • *
  • Posts: 2202
  • Nick Ol' Eye
    • adventur Studios
Re: CB200 Misfiring 1 side when hot
« Reply #2 on: Jul 25, 2017, 13:14:12 »
Another thing I thought of after our last conversation, could it be the one lead coming out of the coil. I would imagine it's a wasted spark so a troubleshooting idea would be switching the spark plug wires and seeing if the problem persists only on the other side. Could be wrong though, but seems like an easy test if your leads are long enough

Good call. Upon visual inspection the leads at the coil seemed OK, but I will give that test a shot and see if the problem follows.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline Hurco550

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 3017
  • Play Stupid Games, Win Stupid Prizes
Re: CB200 Misfiring 1 side when hot
« Reply #3 on: Jul 25, 2017, 13:23:25 »
Good call. Upon visual inspection the leads at the coil seemed OK, but I will give that test a shot and see if the problem follows.
Yeah, the issue I'm thinking of wouldn't necessarily be something that Could be seen visually

Sent from my SM-G900V using Tapatalk

Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer

Offline SONIC.

  • DTT SUPPORTER
  • *
  • Posts: 5908
  • Reminds me of...me No, I'm sure of it. I hate him
Re: CB200 Misfiring 1 side when hot
« Reply #4 on: Jul 25, 2017, 13:54:13 »
beat me to it,
but swap the leads and see if the problem changes side. If it does replace the coil, if it remains on the same side you know it's not the coil and can start looking elsewhere.
(carb probably)

Offline irk miller

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 6751
  • You've been mostly-dead all day.
Re: CB200 Misfiring 1 side when hot
« Reply #5 on: Jul 25, 2017, 14:15:19 »
Look under the points cover for a mark (probably black, or a divot) to see if it's shorting out on the cover.  Inspect the insulation on the points wires and check the washers.  It could be bad coil, but I'd make sure it's not shorting during advance. 

Offline Sonreir

  • Moderator
  • DTT SUPPORTER
  • *
  • Posts: 10345
  • Oregon
Re: CB200 Misfiring 1 side when hot
« Reply #6 on: Jul 25, 2017, 14:25:29 »
Look under the points cover for a mark (probably black, or a divot) to see if it's shorting out on the cover.  Inspect the insulation on the points wires and check the washers.  It could be bad coil, but I'd make sure it's not shorting during advance. 

360° engine on the 200. Only one point.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys


Offline trek97

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 5194
Re: CB200 Misfiring 1 side when hot
« Reply #8 on: Jul 25, 2017, 14:31:59 »
I'm assuming a single carb w split manifold on this machine?

Offline teazer

  • DTT SUPPORTER
  • *
  • DTT BOTM WINNER
  • *
  • Posts: 8248
Re: CB200 Misfiring 1 side when hot
« Reply #9 on: Jul 25, 2017, 14:44:57 »
Fiurst, pull both carbs off and clean them a couple of times.  The trick with carbs is to squirt fluid (WD40 or carb cleaner) through one passageway and then repeat on that same circuit on the other carb.  It's the easiest way to see what is going on.  make sure all teh jets flow the same side to side and theat the float valves are clean and no garbage trapped above them.

Next, I would replace the coil.  They are cheap and available on ebay or other suppliers.

Then I would look at the most likely cause and that's a blockage in the fuel system.  Could be the tap or the filler cap breather hole which tends to get rusted and the rubber/cork seal often obscures it.  It could also be a slow fill on one side but you wiil have fixed that when you clean out the carbs.