Johnt3
Still learning...
Good for you Paul! Enjoy that good weather my friend. I hope to get mine fired and a little scoot in on Sunday.
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UK Bobber Build thread
- Thread starter Paulrxs650
- Start date
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- Tags
- build
Paulrxs650
XS650 Enthusiast
Yep, weather is forecast to be good for the weekend! Yey!
Hope to get a few more miles on!
Ordered the Canadian needles and jets from Heiden yesterday so hopefully they'll be here next week and I can carry on with some jetting experimentations!
Hope to get a few more miles on!
Ordered the Canadian needles and jets from Heiden yesterday so hopefully they'll be here next week and I can carry on with some jetting experimentations!
Paulrxs650
XS650 Enthusiast
Well the weather this weekend has been ok. So, I've been out and and about putting a fair few miles on ! Got almost 700 on now 
Been tinkering around with the jets. I seem to be best at 45 pilot and 142.5 mains with three turns out on the mix screw. However, whatever jets I go for I still have the stumble in the midrange but I hope the adjustable needles will sort that out.
Riding around that stumble is producing good throttle response and strong acceleration at WOT to 90mph which, to be honest is quite enough!
Put around 100 miles on it today and I'm seeing 50 mpg with good coloured plugs so I am relatively happy with the set up bar the stumble.
Had a slight oil leak from the left hand cam cover. Upon investigation, it wasn't the seal but the gasket effectively being too thick and, combined with the o ring, not allowing the cover to seat firmly. So, I trimmed a 1/16th of the inside of the gasket which let the o ring sit flush. As of yet, no more leak
Been tinkering around with the jets. I seem to be best at 45 pilot and 142.5 mains with three turns out on the mix screw. However, whatever jets I go for I still have the stumble in the midrange but I hope the adjustable needles will sort that out.
Riding around that stumble is producing good throttle response and strong acceleration at WOT to 90mph which, to be honest is quite enough!
Put around 100 miles on it today and I'm seeing 50 mpg with good coloured plugs so I am relatively happy with the set up bar the stumble.
Had a slight oil leak from the left hand cam cover. Upon investigation, it wasn't the seal but the gasket effectively being too thick and, combined with the o ring, not allowing the cover to seat firmly. So, I trimmed a 1/16th of the inside of the gasket which let the o ring sit flush. As of yet, no more leak
I am Carbon
shade tree mechanic
Hey Paul. Riding is good 
Does your exhaust have mufflers?
Or are they straight pipes?
If they are straight pipes watch this video.
I found it it the exhaust thread.
Hell watch it anyway.
Does your exhaust have mufflers?
Or are they straight pipes?
If they are straight pipes watch this video.
I found it it the exhaust thread.
Hell watch it anyway.
Johnt3
Still learning...
Dang Carbon, That got me thinkin' about what I might be doing to my exhaust.Thank you man!
I am Carbon
shade tree mechanic
John that video got me to thinking as well.
My exhaust is not, shall we say good for the mid range.
My exhaust is not, shall we say good for the mid range.
Paulrxs650
XS650 Enthusiast
Really interesting video Carbon!
I have the knocked in baffles on mine but they arent as restrictive as on the video, and my midrange is reasonable, and should be even better when I can drop the needle a tad.
Got the carbs stripped down last night and the needle jets knocked out too. Just waiting for the Canadian needles to turn up from Heiden.
I have the knocked in baffles on mine but they arent as restrictive as on the video, and my midrange is reasonable, and should be even better when I can drop the needle a tad.
Got the carbs stripped down last night and the needle jets knocked out too. Just waiting for the Canadian needles to turn up from Heiden.
Johnt3
Still learning...
I was thinking you just had the steel baffles in yours Paul.
700 miles! Hell you should be tired of that damn old bike now!
700 miles! Hell you should be tired of that damn old bike now!
Paulrxs650
XS650 Enthusiast
Ha Ha - nah loving it!
They are the steel baffles but are more like an exhaust internal inside with the perforated sheet and baffles which I added from an old trail bike exhaust was a perfect fit so thought why not.
Well time to go home now! Maybe some needles will be waiting!
They are the steel baffles but are more like an exhaust internal inside with the perforated sheet and baffles which I added from an old trail bike exhaust was a perfect fit so thought why not.
Well time to go home now! Maybe some needles will be waiting!
Paulrxs650
XS650 Enthusiast
So, been away with work and come home to an empty mat - still no needles
As I want to be out riding this weekend in this lovely weather. I wanted to find a way to drop the needles. So I ground down a parting tool and popped the needles in the lathe and machined another slot above the original. Measured on the vernier and all happy.
So, if the the new needles don't turn up, at least I have something to try
As I want to be out riding this weekend in this lovely weather. I wanted to find a way to drop the needles. So I ground down a parting tool and popped the needles in the lathe and machined another slot above the original. Measured on the vernier and all happy.
So, if the the new needles don't turn up, at least I have something to try
Johnt3
Still learning...
Well dang Paul, to bad your needles didn't show up yet. Sounds like you have things under control though man.
Paulrxs650
XS650 Enthusiast
Up nice and early to another lovely day this morning with an ulterior motive to get my needles installed and out for a test!
I have a nice new camera that does good close ups so here is a picture of the "modified" stock needle. The plastic washer is pulled down so you can see the new groove a little clearer:
Popped them back in and out for a run - YEY Success!!!
No more midrange stumble, nice and strong pull and will sit at 80 but will go to 90 / 95 where I kind of chickened out and reminded myself not to be silly !
Jetting at the moment is 45 pilot, 142.5 mains and 3 turns out on the mixture screw. I think I could still go up a main size or two but a look through the stock only produced a 150 main which I think is too big. Might order a 145 and 147.5 this week to try out of curiosity. Incidently the Heiden needles still have not turned up but I dont really care now
I have a nice new camera that does good close ups so here is a picture of the "modified" stock needle. The plastic washer is pulled down so you can see the new groove a little clearer:
Popped them back in and out for a run - YEY Success!!!
No more midrange stumble, nice and strong pull and will sit at 80 but will go to 90 / 95 where I kind of chickened out and reminded myself not to be silly !
Jetting at the moment is 45 pilot, 142.5 mains and 3 turns out on the mixture screw. I think I could still go up a main size or two but a look through the stock only produced a 150 main which I think is too big. Might order a 145 and 147.5 this week to try out of curiosity. Incidently the Heiden needles still have not turned up but I dont really care now
I am Carbon
shade tree mechanic
All right Paul!
Now ride like the wind before the rain starts!
Now ride like the wind before the rain starts!
Johnt3
Still learning...
Great job Paul! I'm glad to see and hear you have your bike dialed in man.
What kind of temps do you see in your area in the summer? We'll most likely get into the 100's pretty soon.
What kind of temps do you see in your area in the summer? We'll most likely get into the 100's pretty soon.
Paulrxs650
XS650 Enthusiast
Thanks John
Ha ha a hot day over here is in the 70s, 80s at a push
Ha ha a hot day over here is in the 70s, 80s at a push
Johnt3
Still learning...
Yeah, it got to about 82 here today. Rain tonight, then sunny tomorrow. Hope to get to the shop and do some work on the bike!
Paulrxs650
XS650 Enthusiast
Nice one John!
It's pissing down here again
Shooting this morning but hope it'll fair up this aft!
It's pissing down here again
Shooting this morning but hope it'll fair up this aft!
Johnt3
Still learning...
Well damn Paul! I hope you got some riding in today after all.
Paulrxs650
XS650 Enthusiast
Yep got a few miles in this afternoon. Got 800 on her now
Going to chase up these needles and jets today.
Going to chase up these needles and jets today.
Paulrxs650
XS650 Enthusiast
Hurrah the needles and jets have arrived - now just to find time to get them in
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