Author Topic: RD200DX piston rings  (Read 274 times)

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Offline Alistair64

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RD200DX piston rings
« on: June 10, 2017, 08:02:47 PM »
Uh oh...I hope this isn't another contentious topic!
All I'm looking to know is ...can aftermarket rings be used on genuine pistons? If so, what make is recommended?

Took the RD along to the Daventry bike festival today. A whole 2 miles from where I live!
It was a good day, but the two stroke fraternity was sadly lacking.
In fact, there were only 2 others there and no RD's at all  :(
Had a long chat with a guy who had just restored his GT750 kettle. It was mint and won the classic award.
I did enter my bike, but unfortunately it didn't get a say...too many highly chromed Harleys, trikes and other bikes which would catch the judge's eye more than my little RD200.
Having said that, it did generate a lot of interest from the public.
I digress.

It's starting to run like a pile of **** at low RPM.
The problem is a misfire on the right cylinder below 4K.
Once you blip the throttle it's fine.
Anyway, I've decided to take it off the road and get on with some outstanding tasks.
I plan on finally fitting the 250LC carbs with pod filters (as there is a chance the misfire is being caused by a blocked idle jet).
Also, new rings instead of a rebore. However, I'll establish if a rebore is needed once the barrels come off.
I took the head off one side a couple of weeks ago and the bore looked good with no ridge at the top, so I'm going to put new rings in as a matter of course.
It's already had new plugs, points and one condensor, so I'm hoping the low RPM misfire is being caused by a fueling problem.
1982 Candy red RD200DX
1986 RD350F1

Online petermigreen

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Re: RD200DX piston rings
« Reply #1 on: June 10, 2017, 09:17:32 PM »
Is it a misfire or just not running on the right cylinder which could be a symptom of low battery voltage. Experienced myself. I'd put a multimeter on the battery and see what it is when you're seeing the misfire. In my experience anything below 12.5v and bike (or could just be my bike) will run erratically. Hopefully you'll see a healthy voltage and you can eliminate it from your fault finding. Good luck.
Peter.
1928 Ford Model A Tudor
1944 Harley Davidson 42WLA
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1975 CB400F0 US import
1976 DT175C US import
1982 RD200F
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Offline Alistair64

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Re: RD200DX piston rings
« Reply #2 on: June 11, 2017, 09:37:35 AM »
Thanks, Peter.
I'm sure the battery's fine as it starts on the electric start (eventually).
Before the misfire developed, it always started easily on the electric start, so I think it's only taking longer because of this misfire.
It does seem to be a misfire. It splutters and even cuts out on that cylinder at low revs.
I tend to keep the battery charged up every week or two anyway, so I don't think it's that.

Incidentally, concerning the rings, it's on a standard bore so I'm assuming the pistons are original.
I'd like to use genuine Yamaha rings if possible, but are they still available from anywhere?
« Last Edit: June 11, 2017, 12:21:32 PM by Alistair64 »
1982 Candy red RD200DX
1986 RD350F1

Offline Alistair64

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Re: RD200DX piston rings
« Reply #3 on: June 11, 2017, 12:24:18 PM »
Also, does anyone know what the difference is between 397-11610-02 (there are a few on Ebay) and 558-11601-00 (none I can find).
The last number is the one listed in the 2R7 parts list as standard piston rings for the DX model, so I'm assuming the first part number is for the earlier models?
Are they not interchangeable?
1982 Candy red RD200DX
1986 RD350F1

Online davecumbria

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Re: RD200DX piston rings
« Reply #4 on: June 11, 2017, 01:49:13 PM »
The earlier rings don't fit, they differ in that they are a "dyke" ring

Yes you have found the same trouble I've had getting Yamaha rings the 558 rings just don't seem to exist even though you can get pistons no problem, the last set I managed to find were in a dealer in New Zealand and had to come via Canada.

The DT100 piston is often used as a replacement so that might be the way forward


EDIT. just checked the fowlers website and they have listed a replacement as part number 23F-11601-00 so may just have to get some!
« Last Edit: June 11, 2017, 01:53:07 PM by davecumbria »
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Offline Alistair64

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Re: RD200DX piston rings
« Reply #5 on: June 11, 2017, 08:32:53 PM »
That replacement part number you gave is also showing as out of stock and on back order, so not sure if that means they're not available. Not cheap at £26 per side but I guess beggars can't be choosers. I suppose only one way to find out by placing an order.

I don't want to go the DT100 route thanks because the stroke is slightly different and therefore the port window sizes in the piston are likely to be different...unless someone can confirm the pistons do look identical.
« Last Edit: June 11, 2017, 08:35:20 PM by Alistair64 »
1982 Candy red RD200DX
1986 RD350F1

Offline RDDave

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Re: RD200DX piston rings
« Reply #6 on: June 11, 2017, 08:39:40 PM »
Out of stock and on back order means still available, usually says discontinued if not available any more.   :)

Online davecumbria

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Re: RD200DX piston rings
« Reply #7 on: June 11, 2017, 09:30:05 PM »
Agreed, they are still available from Yamaha but Fowlers wont hold them in stock and get them when ordered by a customer
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Offline Alistair64

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Re: RD200DX piston rings
« Reply #8 on: June 16, 2017, 07:48:19 PM »
Agreed, they are still available from Yamaha but Fowlers wont hold them in stock and get them when ordered by a customer

For information to everyone, I called in to Fowlers today as I was working in the area.
Despite 23F-11601-00 showing as on backorder on their web-site, the guy looked it up and apparently it's been discontinued.
I was going to place an order, but I guess that's it now...genuine piston rings are officially NLA for the RD200DX  :(
1982 Candy red RD200DX
1986 RD350F1

Online davecumbria

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Re: RD200DX piston rings
« Reply #9 on: June 17, 2017, 06:56:02 AM »
OK done a bit more research, 23F is RX100, and the amount of them belting round in India (see the FB page) will mean they are about and available

There are loads on Ebay, but not in the UK, apart from these.... http://www.ebay.co.uk/itm/Yamaha-RS100-Piston-ring-set-23F-11601-00-/292150826304?hash=item44058bd540:g:VhgAAOxyMxpRxzQP


You may know the seller, he's the Editor of a famous magazine..... Mr Derek  (Superdel) Freeguard !!!!!
« Last Edit: June 17, 2017, 06:59:23 AM by davecumbria »
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Offline Alistair64

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Re: RD200DX piston rings
« Reply #10 on: June 17, 2017, 11:00:34 AM »
OK done a bit more research, 23F is RX100, and the amount of them belting round in India (see the FB page) will mean they are about and available

There are loads on Ebay, but not in the UK, apart from these.... http://www.ebay.co.uk/itm/Yamaha-RS100-Piston-ring-set-23F-11601-00-/292150826304?hash=item44058bd540:g:VhgAAOxyMxpRxzQP


You may know the seller, he's the Editor of a famous magazine..... Mr Derek  (Superdel) Freeguard !!!!!


Yeah, I did see these, Dave.
However, they look suspiciously unlike gen Yam in that packaging!
1982 Candy red RD200DX
1986 RD350F1