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Hi all,

Could one of you experts tell me what original master cylinder should be on this bike. Is it the one which has a translucent reservoir like the UK model? Does the fitting has any distinguishing names/marks on the fitting eg NISSIN?

Many thanks for your help and a picture or two would be appreciated.

Dave
2
I am looking for some new genuine footrest rubbers for my 400C which are discontinued but i notice that some ebay sellers are listing the LC footrests rubber part number 4L0-27423-00 for the RD400?

My question is, are these a suitable replacement and do the the fit correctly.

Thanks.
3
It is a rd400. So let me make sure I am getting this correct. Each time the points open then close at the moment they close it should ground the points and the orange or grey wire and there should be a spark at that moment at the spark plug correct? So in theory I can unplug the orange lead from either one of the coils and run a jumper wire from the + battery and quickly touch it to the orange lead and I should get a spark as long as the coil, plug, plug wire, and plug is grounded to the block?


you should have a spark generated immediately as the points open. this creates a feed at the orange or grey wire at the coil which in turn creates the HT spark. If you dont have a spark at plug (grounded on cylinder head),  have a test light earthed and connected to the orange or grey wire at coil, it will light up as points are opened if LT side is working correctly. If no light then you have a break in the LT circuit betwen coil and points.
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Aircooled RD Tech Help 250cc and Above / Re: Temp fuel "tank"
« Last post by nerradw on Today at 03:09:40 PM »
Yep very handy. I bought a similar one when I was having problems with the coils,saves taking tank off and on which is always a drag. Mine hasnt got a tap as good as yours though.
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Aircooled RD Tech Help 250cc and Above / Temp fuel "tank"
« Last post by mts on Today at 02:59:44 PM »

Recently bought one of the cheap temp fuel tanks from eBay. A simple plastic clear pot with tap and fuel line and less than a tenner.
Very useful bit of kit just add a T piece for the twin carbs .very handy to save tank on and off faff when setting up and I would recommend. Also gives you a good idea on how thirsty she is as graduated scale on side
6
Looking at the flywheel straight on the points on the lower left at 8 o'clock are for the left cylinder and points at top right at2 o'clock are for the right side.
Now. Remove spark plugs and rotate engine slowly with the kickstart until one set of points are fully open, then turn on the ignition and open the other set of poits with a lolly stick or something insulated. You should see a good blue spark each time you manually open the points.
Now do the opposite set . IMPORTANT dont leave ignition on for very long or youll damage the coils.
If you find a good spark at each set of points using this method you can now put a sparkplug in its cap and lay it on the head, now make the points spark as before and you should see a spark at the corrisponding plug.
If you dont then it might be good to try a borrowed coil.
PS.as Bluehaze has said do this in a dull area of your garage
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It is a rd400. So let me make sure I am getting this correct. Each time the points open then close at the moment they close it should ground the points and the orange or grey wire and there should be a spark at that moment at the spark plug correct? So in theory I can unplug the orange lead from either one of the coils and run a jumper wire from the + battery and quickly touch it to the orange lead and I should get a spark as long as the coil, plug, plug wire, and plug is grounded to the block?

Sorry I don't know about this bike.
8
Restorations Diary / Re: UK Pre A 350 'box of bits' Resto
« Last post by nerradw on Today at 01:12:37 PM »
This might be what you are referring to in which case you could easily make one.
https://www.cmsnl.com/yamaha-ds7-1972-usa_model8399/seal_2142126800/#.Xo2_ANjTU0M
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Thanks John.

I sort of see how it could be, but it doesn't bear much resemblance to the item shown in the parts manual.

Regards.

Alan
10
It is a rd400. So let me make sure I am getting this correct. Each time the points open then close at the moment they close it should ground the points and the orange or grey wire and there should be a spark at that moment at the spark plug correct? So in theory I can unplug the orange lead from either one of the coils and run a jumper wire from the + battery and quickly touch it to the orange lead and I should get a spark as long as the coil, plug, plug wire, and plug is grounded to the block?
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