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Old 10-20-2012, 10:16 PM   #1351
MattSR500
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Joined: Jul 2009
Location: Melbourne, Australia
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A Photo from Your Ride

Might I invite people to chuck up a nice photo from their latest ride whenever they get out on their W?



Here's a few of mine from some recent rides.

This is from a 2000km trip to Broken Hill, NSW:




This is from a 500km back roads ride to my hometown, Nyah, Vic. The bike and I later got caught in a dust storm and I've never quite got all the dust out:




And this is from another 2000km trip, this one through the Victorian Alpine region, here near Omeo. From my mate's camera with some fancy effect:

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Old 10-21-2012, 12:41 AM   #1352
Scrivens
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This one may have been up before - 800 in the Hills:



Nice bike for dirt roads.
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Old 10-21-2012, 07:40 AM   #1353
Pigford
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Quote:
Originally Posted by Scrivens View Post
All carb tuning does is to adjust the air/fuel ratio to maximise the burn efficiency of the fuel at a given rpm and load.
Adjusting the needle height, pilot jet, air screw, effects the air:fuel at a respective throttle opennings - irrespective of revs!
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Old 10-21-2012, 07:55 AM   #1354
ORexpat
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Quote:
Originally Posted by Scrivens View Post

The air screw smooths the idle, maximises the fuel efficiency at idle and nothing more. It has no effect on the bike once the carb is running off the pilot circuit and the slide and needle are rising. To adjust it properly get the bike fully warmed up, set the idle at the correct rate - 1000rpm - and *very slowly* turn the screw in until the motor stumbles. Then turn it out until the engine revs go up to their fastest point, and keep turning it past that until the motor just starts to stumble or hunt, then turn it back in 1/2 a turn. Do one carb only to this point and then do the other side the same. Adjust the idle speed (if it has changed) back to 1000rpm and do the whole thing again until you get the idle at that 1/2 turn back point and idling at the correct speed. You need to make each turn of the screw very slowly and in tiny increments and wait for the carb to adjust to the new mixture before you move it again. Take about 10 mins per air screw and do it in a quiet place where you can really hear what the motor is doing. If it still isn't perfect after 10 mins per side, take the bike for a short run to cool it off and do the final tweaking. On a multi cylinder bike you can do the same with a set of air gauges, but you still need to balance the dials at that same point where the idle is at the fast point on each carb as the screws are turned.

Tried that. Never could get a change in revs. Suspect the vacuum is already raising the slide a touch at 1000 rpm, overcoming the air screw.
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Old 10-21-2012, 11:24 AM   #1355
Barnone
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Quote:
Originally Posted by ORexpat View Post
Tried that. Never could get a change in revs. Suspect the vacuum is already raising the slide a touch at 1000 rpm, overcoming the air screw.
Also tried that technique with no success. My W650 is running just fine with the only carburetor modification being three turns out.


Just got back from a nice ride here in the mountains of Western North Carolina. The color is just about at it's peak.
In the background is the Santeetlah hydroelectric dam finished in 1928.
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Old 10-21-2012, 03:26 PM   #1356
ORexpat
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Nice photo, Barnone.
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Old 10-21-2012, 05:09 PM   #1357
Scrivens
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Quote:
Originally Posted by Pigford View Post
Adjusting the needle height, pilot jet, air screw, effects the air:fuel at a respective throttle opennings - irrespective of revs!
Yep, the A/F ratio is what the carb is all about, and notice that I said rev range and load. At 5000rpm in 5th on a flat road the throttle may be 1/8th open, at 5000rpm going up a hill in 4th with a pillion it might be wide open.
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Old 10-23-2012, 12:09 PM   #1358
Barnone
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Still Nice Riding in Western North Carolina

Still nice riding here in the mountains of Western North Carolina.



Took the gravel forest service road 81 ( map from http://www.tailofthedragon.com/other...wartcabin.html )
which runs kinda parallel to the Cherohala Skyway and stopped at the old Stewart Cabin about halfway up for a photo. Lots of bear hunters out for the season which started October 15th.
Got on the Cherohala Skyway at Stratton Meadow and took it back home. The fall colors are just about gone above 4000 feet.

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2012 Dong Fang DF250RTB hard tail bobber
2014 Sky Team ST125-8A Z50 clone monkey bike
2014 Ice Bear PBZ110-1P Z50 clone monkey sidecar
2014 Sky Team MC-D34 CT70 clone

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Old 10-23-2012, 01:22 PM   #1359
tonymorr
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Barnone; I'm jeleous that you live in such a great riding area. Sorry if it's been discussed but are those Distanzias on your bike?
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Old 10-23-2012, 02:16 PM   #1360
Barnone
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Tony,
Yep, great riding here in WNC but in two weeks I will be in flat Florida for the winter.

They are Avon Distanzias. They seem to just be ok in the gravel. They probably would be better if I dropped the psi when on the gravel but I would need to have an air compressor to pump then back up for pavement.
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2012 Dong Fang DF250RTB hard tail bobber
2014 Sky Team ST125-8A Z50 clone monkey bike
2014 Ice Bear PBZ110-1P Z50 clone monkey sidecar
2014 Sky Team MC-D34 CT70 clone
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Old 10-23-2012, 02:16 PM   #1361
Duelsporter
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Quote:
Originally Posted by MattSR500 View Post
Might I invite people to chuck up a nice photo from their latest ride whenever they get out on their W?
Took the W for a nice 120 mile ride today. Beautiful early fall day in Georgia.

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Old 10-23-2012, 02:34 PM   #1362
Duelsporter
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Quote:
Originally Posted by Barnone View Post
Still nice riding here in the mountains of Western North Carolina.



Took the gravel forest service road 81 ( map from http://www.tailofthedragon.com/other...wartcabin.html )
which runs kinda parallel to the Cherohala Skyway and stopped at the old Stewart Cabin about halfway up for a photo. Lots of bear hunters out for the season which started October 15th.
Got on the Cherohala Skyway at Stratton Meadow and took it back home. The fall colors are just about gone above 4000 feet.

Hey - I've been there! But on the DR650 -- not the W.

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Old 10-23-2012, 09:01 PM   #1363
zwish
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Marble Mod!

I blocked off the KCA with a marble today. This is a HUGE improvement. I shouldn't have waited so long to do it. First off, there is zero popping when I clutch in or decelerate, but more importantly, everything feels much smoother now; accelerating, engine braking. Thanks for the assistance.
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Old 10-24-2012, 06:20 AM   #1364
Barnone
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Zwish,
Glad the marble mod helped but in theory it should only reduce the popping and maybe make the engine run a little cooler.

The air is injected downstream of the exhaust valve to increase the burn of any exhaust gases to reduce emissions. Some W650 owners here have had improvements when removing the entire air injection system and capping off the vacuum port at four way fitting that is used to drive the air pump. The theory in that situation is there was an air leak in the hose or pump causing a lean condition.
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2012 Dong Fang DF250RTB hard tail bobber
2014 Sky Team ST125-8A Z50 clone monkey bike
2014 Ice Bear PBZ110-1P Z50 clone monkey sidecar
2014 Sky Team MC-D34 CT70 clone
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Old 10-24-2012, 06:31 AM   #1365
zwish
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Originally Posted by Barnone View Post
Zwish,
Glad the marble mod helped but in theory it should only reduce the popping and maybe make the engine run a little cooler.
Man, I thought the same thing and I had read the Jerk's post a ways back about how when he actually removed the system instead of just blocking it off, it caused a 300rpm rise in his idle (probably curing an air leak). But there is a definite, noticeable improvement in the way the bike accelerates and engine brakes now. Maybe I'm crazy, but either way, I'm pleased with the results.

zwish screwed with this post 10-24-2012 at 06:59 AM
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