Manky's XS650 Yamaha

[Manky Monkey]

New manifolds.

[Manky Monkey]

Amals. Missing half the internals, but all available new from the Amal website.

[Tony oily bike]

They look nice, and fitting non-CV carbs give it an older/classic look too.  Always like the look.

I've a set of roundslide mikunis to fit to mine (quite a common mod), they’re kinda the Japanese equivalent to the mkI Amals

Couldn't quite see if you had insulating blocks between the carb flange and manifold, but just in case you haven’t, I’d suggest it will be worth fitting them as the Triumph workshop manual shows the following assembly order for MkI Amals: carb, O-ring, insulating block, paper gasket, manifold.

One reason for insulating blocks (and in more modern times ‘rubber mounts) is to reduce the heat transfer from the cylinder head to carb,

The original XS650 CV carbs used ‘rubber’ adaptor mounts, and photos I've seen of XS650s with the roundslide mikuni conversion also use rubber mounts.

Really old (early 1900s) vintage bikes can actually boil the fuel in the carb when the bike is parked up after a run........... ask Dslam. We had to wait ages for the darling little bike to cool down!!  



Photo shows original CV carb mounting

[Dslam]

SMOKIN

[Olds]

SMOKIN

Well hopefully not

[fifer]

Andy , a few questions on the Amals .
{ 1 } Are you going to be using separate cables or the single into 2 adaptor on the Amals ?
{ 2 } Gonna balance the 2 carbs up using lollipop sticks etc ?
{ 3 } Doing away with the choke slides { if fitted} and fitting blanks ?
{ 4 } Gonna fit the viton tipped needle valves ?
{ 5 } Gonna enjoy have petrol fingers again after a tickling session ?
.
.



   

[Manky Monkey]

Ahh, the joys of stinky fuely fingers!
I was going for the 1 into 2 cable set-up to operate the choke slides.

[Cabman77]

Ahh, the joys of stinky fuely fingers!
I was going for the 1 into 2 cable set-up to operate the choke slides.

I think I`ve got a nice little chrome 2 to 1 able housing thingey somewhere. I`ll see if i can find it for you Andy, if you want it?

[Manky Monkey]

Yuss please Mr C. 
Various jets & needles ordered from the Amal website. Looking for insulating blocks now.

[hunter]

Andy,What size carbs are they,I have some insulating material here could make some.

[Manky Monkey]

It's O.K mate, just ordered some 3mm thick ones from Hitchcocks Motorcycles, thanks to a link from Dslam.
Ain't t'internet wonderful. 

[hunter]

No problem,Thestuff i have is thicker than 3mm,probably 12 or 14mm.

[Manky Monkey]

A quiet afternoon at the workshop today. Various bods there working on their own projects, so I was just tinkering.
Decided to quickly chuck the motor back in the frame to check the carb clearance. Quickly chuck it in -ha!! Big Darren & I struggled with it for over an hour & got absolutely nowhere -except he managed to pinch his big fingers between the engine & frame. Ouch. Could've been worse though. Could've been my fingers.
Even though the engine was in the frame when it was hardtailed, it looks like the bottom frame rails may have tweaked inwards a little during welding. In the end I had to sand the inside faces of the engine mounts with a soft pad on the angle grinder to clearance them. Still took 4 of us to get the motor in. XSs are bloomin' heavy old lumps. Gonna be fun doing it when the frame's painted.

[Manky Monkey]

The new cast aluminium carb manifolds aren't as sharply angled as the steel ones Pete started making when he built the hardtail. That means I have to fit 1" Amal bellmouths rather than the 3" ones I bought at the Popham Megameet back in August, otherwise they'd foul on the frame. Just as well the 3" ones I bought were the wrong size for the carbs I've got.  Anyone want a lovely pair of polished ali 3" bellmouths for 600 series Amal carbs?

[Manky Monkey]

This old exhaust flange is almost exactly the same as the standard Amal 1" intake.