Rs36 inlet rubbers

S

Shuggie

Full member
Location
Scottish islands
Big day today and got the 1200TS running for the first time , it's all good no oil leaks or nasty noises as you'd expect with a Keith Nairn built engine...it's super to hear it running after two and a half years 🙂 quiet engine no smoke

The only minor issue is that rs36's annoyingly keep working their way off the aluminium stubs....seems to happen more when the engines hot....I've tried using a grease and oil film remover solution to clean the mating surfaces but they keep doing it...anyone got a solution?

I've seen a brace to the cylinder head used to stop them moving up and down, is that the solution..

Any ideas welcome 😁
 
A neat solution, Piet I like it...😀

My redax stubs are made to exit horizontal metal stub and a rubber joint piece, do you have an issues with the rs36 carbs contacting the underside of the tank
 
Nope. As stated, no issues at all.

Engine in stock location in basically stock frame with a 1200 tank. Haven't even bothered to lift the rear of the tank...

The undersides of the 1000 (at least the later ones) and 1200 tanks should be identical.

IMG_1572.JPG

piet
 
Is this the bracket you are referring to ?
Set of mikuni's fitted with bracket, supplied by Red. Bracket is sturdy.
Treaded adaptor goes into the cam cover, other end onto the bar joining the 3 carbs.
20250417_172007.jpg
 
That's also what I have from Red: my carbs were wiggling off the stubs as well. Before that alloy mount was made, we were using heavy-duty plastic cable ties. It's much worse in mt case without the airbox, adding a bit of support. Air filter pods add even more cantilever
 
Different carbs (not my engine!) but photo shows Red's threaded adaptor which replaces a cam cover allen screw. I fitted a rubber mount on the carb end of the flat strip bracket to minimise vibration effects on my RS36 setup.

IMG-20200226-WA0003.jpeg
 
Shuggie said:
A neat solution, Piet I like it...😀

My redax stubs are made to exit horizontal metal stub and a rubber joint piece, do you have an issues with the rs36 carbs contacting the underside of the tank
Click to expand...
I have a Red's Mikuni set up on my 1978 1200, complete with Red's alloy angle inlet stubs. To date never had a problem with them coming loose. Yes, without the alloy spacers (see photo), I believe supplied by Red, the top of the carbs hit the underside of the tank. HTH
 

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Thanks a lot to you guys 🙂👍 👍 I am grateful for the information you've passed on, a great help.
I was up early and made a silver soldered adaptor bolt for the cam box , the special shouldered screw was vfr750 and I used a fairly stiff anti vibration bobbin to isolate the carbs...1000010574.jpg1000010571.jpg
 
I chose a slightly different approach. I'd venture an opinion that it's simpler than creating a special cam box bolt and convoluted steel bracket. Obviously it's only suitable for engines with a tacho cable sprouting out of the cam box.
It only took a few minutes to fabricate. It's made from a piece of aluminium sheet - actually an old road sign (bought at the tip shop, not purloined from the side of the road).

If you find a disused road sign, pick it up. Mine was a STOP sign, but that's not important. It's been handy for many small projects. There's not much of it left now.

I'm not sure how thick the road sign is. I could measure it if anyone is really desperate to know, but I'd guess about 1.5mm. There's just enough of a gap under the tacho cable nut for it to tighten down snugly onto the aluminium bracket. The most technical step in the process was to drill and tap a hole in the carburettor frame. I think it's an M5 thread. Luckily I had an M5 bolt to go in it.

Mikuni carb support.JPG

This version (below) was the prototype that I'm ashamed to admit stayed on the bike for about 10 years before I got around to doing the neater job above.
It's even simpler to make. If anyone wants a set of drawings for this prototype version, send me a PM and I promise I'll make an immediate start on ignoring it.

Carb stay.JPG
 
Rob said:
Different carbs (not my engine!) but photo shows Red's threaded adaptor which replaces a cam cover allen screw. I fitted a rubber mount on the carb end of the flat strip bracket to minimise vibration effects on my RS36 setup.

View attachment 103883
Click to expand...
Looks a good set up to me, but I would get rid of the metal plug chain and fit something non conducting.
 
  • Haha
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