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 02-05-2013, 02:12 PM   #6886
Homerb
Gnarly Adventurer
 
Joined: Jun 2011
Location: Toukley NSW Australia
Oddometer: 431
I had a similar problem on a yamaha some years ago. Pulled head off, checked valves, cleaned and rebuilt carbs countless times. Bla bla bla. Turned out to be cdi.
If possible, swap for a known good cdi, to eliminate that as a possibity.
Homerb is offline   Reply With Quote
Old 02-05-2013, 05:10 PM   #6887
m2h
"Old guys rule"
 
m2h's Avatar
 
Joined: Nov 2012
Location: Waipu New Zealand
Oddometer: 115
Hi guys, Am doing a rebuild on my '86 and would like to ask about partzilla's crankcase gasket set. It says its not OEM and i was wondering if anyone had any experience with them? Would appreciate any help as to alternatives
Thanks
M2H
m2h is offline   Reply With Quote
Old 02-05-2013, 07:06 PM   #6888
davek181
Studly Adventurer
 
Joined: Aug 2007
Location: Idaho
Oddometer: 736
I prefer OEM gaskets, sometimes if you price them they are fairly competitive. I definitely use only OEM seals. It is really hard to go back and replace the center case gasket after the fact in case of failure.
davek181 is offline   Reply With Quote
Old 02-05-2013, 11:24 PM   #6889
Stretchah
Gnarly Adventurer
 
Joined: Oct 2012
Location: London
Oddometer: 117
Quote:
Originally Posted by beardothebeardo View Post
I hate writing out what my back ground is. Maybe we all should start putting what experience we have in our signatures, just as a heads up. I have done all that you have talked about. That's why I mentioned having the carbs off multiple times. Just to double and triple check myself. The only other part I can think of is the actual ignition pick-up not picking up as the revs rise. But one would think that would be affecting at all RPMs.

Starving for fuel was the first thought through my head, and will probably triple check all that again.

I was hoping there was something obscure with these bikes that I was missing.



Stock main jets shouldn't produce what I'm going through. If so, then all these bikes when new would have gone through the same thing. They didn't, and that's why I rule that out.
Have you checked the ignition pick up is in the right resistance range? I'd give that a go first as easier to rule out rather than opening up the carbs again. I've had issues with pick-ups before and it tends to bog down in the upper rev range as the resistance builds and it steadily gets worse moving down the rev range over time...if it's not that and I think you said you'd swapped out cdi and coil then at least you know it's more likely to be fuelling issues, good luck
__________________
____________________
84 Harris Magnum 2
84 XL600R
85 Vespa PK135
Stretchah is offline   Reply With Quote
Old 02-06-2013, 05:24 AM   #6890
davek181
Studly Adventurer
 
Joined: Aug 2007
Location: Idaho
Oddometer: 736
Never hurts to double check the electrical side. Usually though it seems electrical maladies aren't so predictable and repeatable. I had an intermittent issue with a stator that had me convinced it was carburetor problems.

I had been battling previous owner neglect and finding white crusties from dried fuel occasionally collecting in the the fuel bowl and getting sucked into a main jet on high flow. Luckily I have XR carbs and could just unscrew the nut off the bottom of the float bowl and dump it out. I cleaned and flushed the tank but still seemed to act up now and again, curiously after a wheelie more often than not, I figured I was stirring up muck in the tank. I would set the front end back down and notice reduced power, very much like one carb's main jet choking on a hairball. It would run but just at half power. Sometimes it would pass on it's own, but more likely I would stop at first opportunity and pull the right main jet cover and dump it out noticing that I really didn't see much for chunks there, but it always worked. I figured I would eventually get all the crap worked though bit by bit. I was curious why always the right side cured it and never had to pull the left.

One day sitting at a stoplight after having been far out of town, the engine shut off like someone had turned off the key. Fortunately I was only about a block from the shop so I could push it from there. I found the stator had failed so I ordered up a Ricky and put it in, a modification I was planning anyway if it gave me any lip. The bike fired right up first kick after the new stator and I also noticed easier starting in general from that point on, so it was apparently weak and I didn't know it. From that day forward my mysterious carburetor drop out problem completely disappeared too. I still wonder to this day how it was triggered by a wheelstand or heavy load, and how pulling the main jet cover and dumping it seemed to revive it. I can only imagine the load broke it down, and the ritual of pulling the cover allowed enough cooling time to recover.

My Ricky stator has failed once too since then, but it died on the charge coil side of it that time and didn't make me walk, or cause any running problems. It had lasted a long time, so I bought another Ricky without hesitation and put it in. I figured it had gone 20,000 miles which was farther than the original so it was the obvious choice. Also after contacting Ricky they offered to repair or replace it free of charge. I still need to send it in to them and have a spare on the shelf just in case.
davek181 is offline   Reply With Quote
Old 02-06-2013, 07:38 AM   #6891
beardothebeardo
Gnarly Adventurer
 
Joined: Feb 2009
Location: City of Champions
Oddometer: 188
Quote:
Originally Posted by Stretchah View Post
Have you checked the ignition pick up is in the right resistance range? I'd give that a go first as easier to rule out rather than opening up the carbs again. I've had issues with pick-ups before and it tends to bog down in the upper rev range as the resistance builds and it steadily gets worse moving down the rev range over time...if it's not that and I think you said you'd swapped out cdi and coil then at least you know it's more likely to be fuelling issues, good luck
You happen to know what the resistance values are for the pick-up? I'm almost positive I checked that awhile ago, but been long enough that I'm uncertain.
beardothebeardo is offline   Reply With Quote
Old 02-06-2013, 01:36 PM   #6892
lookfar
from the land of OZ
 
Joined: Feb 2011
Location: Cairns, FNQ
Oddometer: 562
Quote:
Originally Posted by Moparmanpete View Post
510-570 Ohms
Or 0.7 to 1.0 Volt as the engine is turned over.
__________________
Stu in FNQ
The early bird catches the worm, but the second mouse gets the cheese.
Growing old is mandatory... growing up is optional.
1985 XL250R
1985 XL600R 1988 XR600
lookfar is offline   Reply With Quote
Old 02-06-2013, 05:27 PM   #6893
m2h
"Old guys rule"
 
m2h's Avatar
 
Joined: Nov 2012
Location: Waipu New Zealand
Oddometer: 115
Quote:
Originally Posted by davek181 View Post
I prefer OEM gaskets, sometimes if you price them they are fairly competitive. I definitely use only OEM seals. It is really hard to go back and replace the center case gasket after the fact in case of failure.
Yep I agree there. Ok I'll look into it some more. Thanks Dave
Regards
M2H
m2h is offline   Reply With Quote
Old 02-07-2013, 11:14 AM   #6894
beardothebeardo
Gnarly Adventurer
 
Joined: Feb 2009
Location: City of Champions
Oddometer: 188
Quote:
Originally Posted by Moparmanpete View Post
510-570 Ohms
Mine is at a consistent 389. Too low...
beardothebeardo is offline   Reply With Quote
Old 02-07-2013, 12:25 PM   #6895
Stretchah
Gnarly Adventurer
 
Joined: Oct 2012
Location: London
Oddometer: 117
Quote:
Originally Posted by beardothebeardo View Post
Mine is at a consistent 389. Too low...
Sorry mate don't want to confuse things, but, I just remembered something and have double checked... it may be okay...

I had a few issues when I first bought mine and tested the pickup coil and found it to be 383 ohms, thought it was knackered and bought a nos honda one and found that to be the same. So, I figured there may be an error in the Honda workshop manual or just newer parts testing differently. Anyway, finally sorted out the issues and it seemed to run okay until the issues with the valve seat.

My Haynes manual turned up shortly after and in there it states the pulsar/pickup coil should test at 360 - 440 ohms. I've just tested mine again and it's 383. Not sure if one of the XL guru's can shed any light on this? I'm also wondering what values the clymer manual gives, if anyones got one?
__________________
____________________
84 Harris Magnum 2
84 XL600R
85 Vespa PK135
Stretchah is offline   Reply With Quote
Old 02-07-2013, 02:00 PM   #6896
mcma111
Beastly Adventurer
 
mcma111's Avatar
 
Joined: Jul 2007
Location: San Francisco,Ca.
Oddometer: 10,869
End Float

Stretchah

If you go by a Honda parts fich and have ALL of the shown spacers and washers in place there is no reason to have to shim the shaft. I'd go over the shaft and recheck it for all of the correct pieces. Some end play is normal.
__________________
Steve in SF

BMW's
58 R26
79 R100s
91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
mcma111 is online now   Reply With Quote
Old 02-07-2013, 04:30 PM   #6897
mcma111
Beastly Adventurer
 
mcma111's Avatar
 
Joined: Jul 2007
Location: San Francisco,Ca.
Oddometer: 10,869
Jim who?
__________________
Steve in SF

BMW's
58 R26
79 R100s
91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
mcma111 is online now   Reply With Quote
Old 02-07-2013, 11:09 PM   #6898
Stretchah
Gnarly Adventurer
 
Joined: Oct 2012
Location: London
Oddometer: 117
Quote:
Originally Posted by Moparmanpete View Post
sorry, Jimridesthis was asking about spacers in his rebuild thread.
Yep, definitely not me, but, cheers anyway :)
__________________
____________________
84 Harris Magnum 2
84 XL600R
85 Vespa PK135
Stretchah is offline   Reply With Quote
Old 02-07-2013, 11:20 PM   #6899
Stretchah
Gnarly Adventurer
 
Joined: Oct 2012
Location: London
Oddometer: 117
Hi everyone, while the head is still being worked on :( I thought I'd get a few things upgraded for the Xl :)
My Dakar tank arrived yesterday, planning to do a trip to Morocco later in the year so thought it would be a good idea to increase my range.
I know a few people on here have fitted Dakar/LM tanks, so, I'm wondering how they went about fitting and securing the front tank brackets to the R frame? I want it so that I can still fit and use the standard tank too as the LM one looks like a little large for my off road trips ;) Any ideas or pics greatly received :)
__________________
____________________
84 Harris Magnum 2
84 XL600R
85 Vespa PK135
Stretchah is offline   Reply With Quote
Old 02-08-2013, 06:45 AM   #6900
brucifer
Beastly Adventurer
 
brucifer's Avatar
 
Joined: Nov 2007
Location: Eureka, Ca.
Oddometer: 2,214
Quote:
Originally Posted by mcma111 View Post
Jim who?
Here Steve. http://advrider.com/forums/showthrea...=785374&page=7
__________________
2005 KTM 525EXC-2000 Buell M2 Cyclone-1996 XR600R-Plated 1995 XR600R-1993 Kawasaki KX500-1984 Honda XL600R/XR650L Hybrid-1984 Yamaha TT600L-1980 Honda CB750F
brucifer 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 06:15 AM.


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