Manky's XS650 Yamaha

[Manky Monkey]

  Hadn't thought of that! Thanks for helping load it in the van this morning Mr Chimp.
After a whole afternoon of tweaking mixture & throttle stop screws, lifting, (& lowering again), the needles etc, I've completely lost track of just where we are with it -hah! "We" -as if I had anything to do with it. I sat on a stool in the corner of the shed & tried not to break anything.
As I said to Mr Slam, this is my "keeper" bike. I'm not building another, so it needs to be reliable & useable. So he has a free hand to modify or change whatever he thinks it needs. Looking forward to road testing time now. 

[BikerGran]

Really glad to hear it's running now!

[Baychimp]

I like the sound of throttle stop screwing ( ooh arh). Its great that its running, see what can happen when you get someone who knows what they doing. You could get it M.O.Ted locally, then some tax,insurance and ride it back.

[Manky Monkey]

Yeah, if only I'd found someone who knew what they were doing when I built it. 
Already insured, so I guess I could book an MOT on the way home from Andy's house.
It was taxed as "disabled" by the previous owner, but hopefully that's just a matter of ticking the appropriate box when I re tax it.

[Baychimp]

You knew what you were doing when you built it. Its just the fine tuning you need the help with. Like a lot of us.

[Dslam]

As Andy said,
Loads of snot in the bowls and the small fuel filters fitted would struggle to pass enough fuel without the addition of grinding grit and paint residue blocking them further.
First job-float height. I know from experience this is often overlooked. Although the height is not critical they need to be the same. This done I realised that the carbs are from different periods. The left one has the screw in pilot jet and the right has the pressed in variety. Both are pre Burlen.
Dumped both stripped carbs into the ultrasonic cleaner for 20mins on jolly hot setting. The fluid began clear and ended up a rather nasty grey colour.
Balanced the slide lift by eye.
Rebuilt and fitted we attempted a start. Fired up but ran as rough as hell. Out with the screw driver and start twiddling in an attempt to get a clean idle. This was followed by soft blip and hard blip which revealed over rich transition from pilot to slide cutaway. The next size up would probably make it too lean so I plan to mill the slides to suit. I have successfully done this in the past.
A few small oil weeps and the left exhaust  blowing at the head. Dragging clutch are all minor issues.
I will concentrate on the running issues as Andy is more than capable of sorting those issues.
So, thus far we have a runner. Ticks over OK but not good enough. Rough pilot to slide transition. Needle transition seems OK. Cannot really test needle to main until we get it on the road.
After a few chores tomorrow morning I shall continue.................

[morrag]

Congratulations, once its run for a spell you should expect more like 120-130 psi, thems "Christian units Andy!, per cylinder with no more than a 10psi dfference between.Usually, once going the tweaking settles them down and....bingo, where's that open road.................Morrag

[Dslam]

I was concerned about the 6.5 bar reading, sorry 91psi. Quite low but both pots the same pressure. It is either my pressure gauge is tired or the rings need a bit of running to seal it or strip and rebuild (hopefully not!!) It revs quite crisp on the needle jet and sounds good too so I think all will be well. We shall see.

[Olds]

Well done sir. Hopefully decent filters will stop most of the gunk still in the tank from reaching the carbs. The fact that both cylinders  are low on compression but the same, at least suggests nothing is disasterously wrong.

[morrag]

Sounds "Tickety-Boo" nice one Guys, once its done a few miles the rings will "unstick", is that a technical term and away to go Boyo....Morrag

[Dslam]

Annoyingly today was full of visitors and other stuff so didn't get to the XS. Going to have another go tomorrow.............

[Manky Monkey]

It's been 5 or 6 years since I bought the donor bike, so don't worry about it Andy

[Olds]

It's been 5 or 6 years since I bought the donor bike, so don't worry about it Andy

You bought it in May 2010 (before XS prices sky rocketed). A relatively quick build.

[Manky Monkey]

 

[BikerGran]

A relatively quick build.

hahah love it!