450 Desmo cam bearing circlip size ?

[graeme]

Late model 450 Desmo,

I’m building a 450 engine that I’ve had for a long time.
Was in bits when I bought it
The circlip that holds the cam bearing in place behind the cam bevel gear is missing.
Can anyone tell me what size this circlip is ?
Save me taking it out of a going engine to measure.
Number 42 in the Haynes manual.

Thank you

Regards
Graeme

[themoudie]

Aye Graeme,
After a grand day watching the 2024 NW200 on the TV and seeing as nobody had got back to you, I have dug out the one from the back of the 350 MKIII head that I have apart, I believe that they are the same.

The first link is to identify that we are talking about the same circlip #12 in the head drawing.
250-350-and-450-desmo/all/cylinder-head

If this is the case then this second link takes you to one of our UK suppliers, giving dimensions.

Internal-Circlip-for-36mm-Bore-Diameter-Un-Sprung-Diameter-38.8mm

I have also attached an image of my circlip and using verynear calipers, I measure 39mm OD expanded/33mm ID expanded and 1.5mm thickness.

Aurora was magic last night up here and expected for at least another night, I see Oz was getting some good colours and hope that you might see them too on Taz.

Good health, Bill

[graeme]

Thank you Bill,
That’s what I need.
I appreciate the effort you have taken to answer my question.
(take $20 out of petty cash and buy yourself a beer)

Regards
Graeme

and yes re the Aurora, it was the largest I’ve seen

[themoudie]

G'day Graeme,

Bit of a damp squib t'night, a wee glow to the north, but not the power of last night, which was exceptional. The last I saw as good was 20 years ago, when the whole of the sky had cloud cover and yet at 16:30 it all turned pink and mauve for a good 30 minutes. I've given up trying to get images as I can't keep the camera still enough.

Glad the info was of use and hope that you get the motor running at your convenience.

Good health, Bill

[graeme]

Apparently it was visible last night but I didn’t see anything.

Graeme