CB200 carb issues

[Sesman]

John, does the bike misfire, or just ‘hold back’?

[McCabe-Thiele (Ted)]

When Wendy had her car serviced at the main dealer I picked it up to find it drove home  like a V4 not a V8.

Took it back the next day - they had fitted the wrong plugs!

[Johnwebley]

John, does the bike misfire, or just ‘hold back’?

 just  dies,

  I thought it might be to lean ,so used the choke,no difference,

  new plug caps,  5k resister,new  D8HS plugs

  look clean,

  as said ,runs sweetly up to 6k

[K2-K6]

Advance mech check out ? Can you see it advancing with a strobe ?

[McCabe-Thiele (Ted)]

Have you tried it without any air filters ?

[Johnwebley]

Advance mech check out ? Can you see it advancing with a strobe ?

  it seems strong  at 5k,as the advance comes in around 2.5k  it should be OK,but might be worth trying,

  also  same with and without  air filters, those have been replaced with extremely costly NOS

  just had it running,started easily,blipped well,sounded good,


  would a low battery affect it?

 previously  it started on the button,so not that low,

I had just  topped the battery up now,and maybe I am imagining it ran better?

[McCabe-Thiele (Ted)]

Can't see alternator load slowing the engine rpm tbh, a blip on the throttle with a strobe light attached should show if the advance/retard is working okay.

You seem to have eliminated everything else, going back to a previous question does it start to misfire or just seem like rev limiter has tripped in?

If changing the small old coil for a new one was the cause then it must be the new coil causing the issue no??

[Johnwebley]

just like a rev limiter,


 I can't  re fit the old coil,as I chucked it out ages ago,

mad day of clearing out supposed junk

[McCabe-Thiele (Ted)]

I think most of us have done something similar when doing rebuilds when the old parts  pile gets too large
Is the replacement coil branded?
Is there an alternative that you could try or borrow from a member?

Might be worth trying the original part number to find a  replacement.
Is this yours 30500-306-673 ?

Have you tried the tests on page 63 of the service manual in Ashs dropbox?

.
https://www.squaremotorcycleparts.co.uk/products/ignition-coil-honda-cb200-cb-200-1976-1979?variant=41572787355802&currency=GBP&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic

[Oddjob]

How sure are you that the new HT caps are not fakes, lots of them around and they fail like you state. I had one HT cap that failed when it got hot many years ago now, acted just like that and that was on a four cylinder, just wouldn't rev past 6K. Just cause it's new doesn't mean it can't be the fault.

[McCabe-Thiele (Ted)]

I had a genuine Bosch plug cap fail on an almost new Opel Rekord 1.9  Coupe on my way to Cornwall circa 1973 causing my car to drop onto 3 cylinders.
Had to improvise with my daughters nappy pin as a connector into the plug lead to complete the rest of the journey from Bridgewater where it became almost undriveable dut to it being an automatic.

[Johnwebley]

I think most of us have done something similar when doing rebuilds when the old parts  pile gets too large
Is the replacement coil branded?
Is there an alternative that you could try or borrow from a member?

Might be worth trying the original part number to find a  replacement.
Is this yours 30500-306-673 ?

Have you tried the tests on page 63 of the service manual in Ashs dropbox?

.
https://www.squaremotorcycleparts.co.uk/products/ignition-coil-honda-cb200-cb-200-1976-1979?variant=41572787355802&currency=GBP&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic

I have asked Square For the specifications

Ohm for the coil

Not much point in getting the same again,

Seen some as low as 4,

?

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[Johnwebley]

How sure are you that the new HT caps are not fakes, lots of them around and they fail like you state. I had one HT cap that failed when it got hot many years ago now, acted just like that and that was on a four cylinder, just wouldn't rev past 6K. Just cause it's new doesn't mean it can't be the fault.

Will try others



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[Sesman]

Try ‘Green Spark Plug Co’.  I’m pretty confident they only supply original items judging from what I’ve been supplied with in the past. I’m pretty much convinced your issue is ignition break down.

[Johnwebley]

Try ‘Green Spark Plug Co’.  I’m pretty confident that only supply original items judging from what I’ve been supplied with in the past. I’m pretty much convinced your issue is ignition break down.

Thanks

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