ADVrider

Go Back   ADVrider > Bikes > Thumpers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-15-2011, 05:49 PM   #56896
silverwolf
Gnarly Adventurer
 
silverwolf's Avatar
 
Joined: Nov 2007
Location: Asheville, NC
Oddometer: 267
I did replace the pilot jet already. I really don't think this is a tuning issue as much as a something isn't right issue. I would say misbehaving throughout more than any particular throttle opening. By what is typical I am tuned way rich and yet still running lean. I don't want to be that guy that asks for advice and then doesn't take it but I don't think I will find anything from doing marks on the throttle. I've played with it a good bit and can't really say that it's a particular spot that is problematic.

Quote:
Originally Posted by motolab View Post
Replace the pilot jet (in case it is clogged or perhaps some inappropriate size).

Start and let the engine warm up. Lower the idle speed below the factory spec. Starting from a setting that is known to be lean, adjust the mixture screw to obtain the highest idle speed. Adjust no more than 1/8 turn richer than that. Then, adjust the idle speed back to 1500 rpm. Note the final mixture screw setting and report back.

Put some tape on the throttle housing and the edge of the grip. Mark zero throttle with a sharpie. This is best done with the engine idling, so you can tell when the slack in the cable has just been taken up. Turn off the engine and mark wide open. Now take a tape measure (metric works best in my opinion) and measure the length of the arc. Put a mark at the mid point. Duplicate this procedure to mark the mid-point between here and zero throttle opening to get 1/4 open. Repeat for 1/8 and 1/16 openings.

With the help of the marks, determine precisely during what throttle opening(s) it misbehaves. Don't have an accident trying to look at the marks while riding. If you do, I'm not responsible! Report back with results. This will help us determine what circuit(s) are responsible.

Regards,

Derek
silverwolf is offline   Reply With Quote
Old 11-15-2011, 05:54 PM   #56897
silverwolf
Gnarly Adventurer
 
silverwolf's Avatar
 
Joined: Nov 2007
Location: Asheville, NC
Oddometer: 267
Quote:
Originally Posted by airheadbruce View Post
5th clip kinda bothers me, from the top of the needle = richest, from the bottom( pointy end) = leanest. A leaky diaphragm on the top of the carb can make the needle not rise at all, bikes can run some on light throttle with no needle lifting. Also did this come on after a change or have you been running this combination for a while? Valve clearances pretty close is not the problem.
I think there is a 6th clip but I'm close to the richest setting on the needle. The bike runs all the way through to full throttle but is lean throughout. The diaphram looks good, no tears, the oring is in place at the top. I've tried spraying wd40 on the boots and found no leaks.
silverwolf is offline   Reply With Quote
Old 11-15-2011, 06:03 PM   #56898
Stringer99
Banned
 
Joined: Sep 2011
Location: Central FL
Oddometer: 183
Thumb

Quote:
Originally Posted by Al Tuna View Post
I believe you are correct, part 34 and 35.

Attachment 300459
nice! thanks alot!
Stringer99 is offline   Reply With Quote
Old 11-15-2011, 06:18 PM   #56899
Paddle007
Gnarly Adventurer
 
Joined: Jun 2008
Location: S.E. Louisiana
Oddometer: 300
Quote:
Originally Posted by MarkGS View Post
That all makes sense to me with the exception of clutch / brake levers, but I've seen a lot of people include them in their packing lists. What's the failure mechanism for them? Do they frequently snap in crashes?
Depends on how it hits. I carried extra levers for a couple of years and bought into the internet wisdom of "if your running handguards your levers are safe". Dropped mine on a huge rock and my buddies heard a big snap. The big snap was my handguard and the lesser snap which nobody heard was my clutch lever. Made for an interesting day. Never again. No pic of "the" drop but this was a little earlier.
Paddle007 is offline   Reply With Quote
Old 11-15-2011, 06:33 PM   #56900
Stringer99
Banned
 
Joined: Sep 2011
Location: Central FL
Oddometer: 183
Question

im at 4700 miles on a 2003 and need to take the top end apart to change a leaky head gasket, and a paper base gasket. should i bother to install new rings while i've got it apart?
Stringer99 is offline   Reply With Quote
Old 11-15-2011, 06:45 PM   #56901
shu
...
 
Joined: Feb 2010
Location: Colorado
Oddometer: 900
?? 4700 miles is a new motor. I can't see why you would need to touch anything. Unless you meant 47,000......


...........shu
shu is online now   Reply With Quote
Old 11-15-2011, 06:46 PM   #56902
Al Tuna
PUI... Deal with it
 
Al Tuna's Avatar
 
Joined: Nov 2006
Location: Moran Nation
Oddometer: 11,137
Quote:
Originally Posted by Stringer99 View Post
im at 4700 miles on a 2003 and need to take the top end apart to change a leaky head gasket, and a paper base gasket. should i bother to install new rings while i've got it apart?
How bad are the leaks? If it's minor seepage I'd put a few more thousand miles on it and then do the complete top end.
__________________
Southeast Weather Map

Under construction
Al Tuna is offline   Reply With Quote
Old 11-15-2011, 07:00 PM   #56903
Stringer99
Banned
 
Joined: Sep 2011
Location: Central FL
Oddometer: 183
Quote:
Originally Posted by Al Tuna View Post
How bad are the leaks? If it's minor seepage I'd put a few more thousand miles on it and then do the complete top end.
cylinder head gasket leak is somewhat slow but its also discoloring the motor. i figured id ask since ill be replacing all gaskets now, and pray i dont have to do it again. not sure if i would be throwing my money away on a JE piston or some new rings. Bike is in good condition but i do have a problem with oil turning black and idling/warming up/stuttering issues.
Stringer99 is offline   Reply With Quote
Old 11-15-2011, 07:02 PM   #56904
shu
...
 
Joined: Feb 2010
Location: Colorado
Oddometer: 900
Quote:
Originally Posted by Al Tuna View Post
How bad are the leaks? If it's minor seepage I'd put a few more thousand miles on it and then do the complete top end.


What am I missing here? My bike has 42,000 miles on it and is running nicely. Why would you put a couple of thousand more and then rebuild it? That motor would still have less than 10,000 miles on it.


............shu
shu is online now   Reply With Quote
Old 11-15-2011, 07:05 PM   #56905
vorg
Adventurer
 
vorg's Avatar
 
Joined: Apr 2011
Location: Bangor Maine
Oddometer: 60
Wink Cogent shock group buy

Friendly reminder on the Cogent group buy.

Be sure and tell Santa what you really want.


Chime in here: http://www.advrider.com/forums/showt...301968&page=26
vorg is offline   Reply With Quote
Old 11-15-2011, 07:16 PM   #56906
airheadbruce
Uncle Dumbshit
 
airheadbruce's Avatar
 
Joined: Jan 2004
Location: Idaho
Oddometer: 469
Quote:
Originally Posted by silverwolf View Post
I think there is a 6th clip but I'm close to the richest setting on the needle. The bike runs all the way through to full throttle but is lean throughout. The diaphram looks good, no tears, the oring is in place at the top. I've tried spraying wd40 on the boots and found no leaks.
Well, spark plugs.... torqued correctly and reasonably new and gapped? Plug wires in good condition? Electrical connections to coil, side stand and clutch lever OK? Poor sparking can cause some of your problems. Fuel filter at carb spigot? Compression test... pull a plug and turn engine over with finger over hole, should blow out strong.
Too rich can be as hard to diagnose as too lean also.
__________________
I'm in no hurry, I get paid by the hour....
2010 Aprilia Manana
2009 Suzuki DR650
2008 Yamaha Zuma
airheadbruce is offline   Reply With Quote
Old 11-15-2011, 07:16 PM   #56907
motolab
Beastly Adventurer
 
motolab's Avatar
 
Joined: Feb 2006
Oddometer: 1,951
Quote:
Originally Posted by Stringer99 View Post
Bike is in good condition but i do have a problem with oil turning black and idling/warming up/stuttering issues.
Oil turning black is a symptom of not changing it frequently enough, overly rich mixture or blow by. About that leak down test...

Regards,

Derek
motolab is online now   Reply With Quote
Old 11-15-2011, 07:19 PM   #56908
Al Tuna
PUI... Deal with it
 
Al Tuna's Avatar
 
Joined: Nov 2006
Location: Moran Nation
Oddometer: 11,137
Quote:
Originally Posted by shu View Post


What am I missing here? My bike has 42,000 miles on it and is running nicely. Why would you put a couple of thousand more and then rebuild it? That motor would still have less than 10,000 miles on it.


............shu
I agree with you... If it were my bike and the leak was minor, I'd give it some time... Probably lots of time and miles before I tore it down.

If I had to pull the cylinder, it would get a light honing and new rings.
__________________
Southeast Weather Map

Under construction
Al Tuna is offline   Reply With Quote
Old 11-15-2011, 07:21 PM   #56909
motolab
Beastly Adventurer
 
motolab's Avatar
 
Joined: Feb 2006
Oddometer: 1,951
Quote:
Originally Posted by silverwolf View Post
By what is typical I am tuned way rich and yet still running lean.
If you are convinced that it is running lean, why not install the main jet that makes it run properly at WOT and then determine what the other circuits want?

Regards,

Derek
motolab is online now   Reply With Quote
Old 11-15-2011, 07:25 PM   #56910
Stringer99
Banned
 
Joined: Sep 2011
Location: Central FL
Oddometer: 183
Quote:
Originally Posted by motolab View Post
Oil turning black is a symptom of not changing it frequently enough, overly rich mixture or blow by. About that leak down test...

Regards,

Derek
oil and filter has been changed every 200 miles since purchased 1000 miles ago. i am assuming i am not overly rich because exhaust is almost sootless and plugs are pretty clean.
Stringer99 is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 11:56 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014