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 04-24-2013, 09:10 PM   #601
JAB
Unsprung Weight
 
JAB's Avatar
 
Joined: Dec 2004
Location: Beautiful Monrovia
Oddometer: 1,230
__________________
1991 Honda XR628R
1978 Yamaha XT500
JAB is offline   Reply With Quote
Old 05-27-2013, 08:53 AM   #602
Sidecar Jockey
Studly Adventurer
 
Sidecar Jockey's Avatar
 
Joined: Aug 2012
Location: MD
Oddometer: 523
One of my Xt500's recently started ablowing headlights like crazy. They last about 2 minutes, and the bulb blowing seems to be independent of rpm (they will blow at idle). I rode this bike for about 6 months and 500 miles with NO problems, then the headlght issue started. None of the other bulbs blow out... just the headlight.

Its a 1979 Xt500 E, with stock wiring, and all stock electrical components (it does NOT have the lights ON/OFF switch like the older bikes, the headlight is just on when the motor is running).

The battery is 6 months old, holds a 6.5 volt charge, and when I rev up the motor, the voltage reading at the battery goes to 7 volts. (I know the headlight is seperate from the charging curcuit, I'm just posting this to show that my regulator probably* works)

At the headlight plug, I'm getting about 3 volts, independent of engine rpm. 0 volts with motor off and key on (as it should be). I soldered leads to an 1154 bulb (6 volt dual filament tail-light bulb), and wired it to the headlight plug, and went for a 30 minute ride. The bulb was still working when i got home.

I checked and cleaned the regulator ground, then installed a new 6v sealed beam. It blew within 2 minutes.

Whats with this? Thanks or the help in advance.
Sidecar Jockey is offline   Reply With Quote
Old 05-27-2013, 12:14 PM   #603
pvt joker
Latebird
 
pvt joker's Avatar
 
Joined: May 2011
Location: Cucamonga
Oddometer: 113
I just picked this up last week. It needs a little of everything. I heard it run but I'm going to need to go through it before riding it. The silencer is loose, its got some sort of pressure guage screwed into the window. Front end is KX, I think. It looks as though a previous owner cut off the xt head tube and welded one from a donor kx. Its missing most of the fasteners including those for the seat, tank, fenders and exhaust.

I'll be on the lookout for a frame, exhaust, and all sorts of other bits.







pvt joker is online now   Reply With Quote
Old 05-27-2013, 08:11 PM   #604
BIG ED XT FAN
Beastly Adventurer
 
BIG ED XT FAN's Avatar
 
Joined: Feb 2006
Location: Finger Lakes Western New York
Oddometer: 1,184
Quote:
Originally Posted by pvt joker View Post
I just picked this up last week. It needs a little of everything. I heard it run but I'm going to need to go through it before riding it. The silencer is loose, its got some sort of pressure guage screwed into the window. Front end is KX, I think. It looks as though a previous owner cut off the xt head tube and welded one from a donor kx. Its missing most of the fasteners including those for the seat, tank, fenders and exhaust.

I'll be on the lookout for a frame, exhaust, and all sorts of other bits.







That oil meter will have to go! One tip-over and you have to push it! The front end looks good!!
BIG ED XT FAN is offline   Reply With Quote
Old 05-28-2013, 01:07 PM   #605
montesa_vr
Legend in his own mind
 
montesa_vr's Avatar
 
Joined: Mar 2006
Oddometer: 2,019
Quote:
Originally Posted by stteve View Post
http://www.topspeed.com/motorcycles/...0-ar37550.html

Yamaha started producing its first 4-stroke enduro in 1976 and it was named XT500C. In 1977 the bike became brown and to mark its evolution, Yamaha added a D to the name of XT500. It had the same technical features, wheels and structure.
Yes, the letter designations corresponded to model year. Model year does not always match date of manufacture.

The summary misses a rather major exhaust change from the original 1976 model to all that followed.
__________________
Often wrong, but never in doubt.
montesa_vr is offline   Reply With Quote
Old 05-30-2013, 04:33 AM   #606
xt500nz
Adventurer
 
Joined: Mar 2013
Oddometer: 42
hey pvt joker. do the usd forks hit the tank when the steering is at full lock?. could you add a close up piture of the headstock tube? im fitting 43mm forks, and have been trying to figure out if cutting the top of the tube and pushing it forward, then shifting the 78 tank back will work. don't want to put dents into a classic tank!. cheers.
xt500nz is offline   Reply With Quote
Old 06-02-2013, 08:24 PM   #607
pvt joker
Latebird
 
pvt joker's Avatar
 
Joined: May 2011
Location: Cucamonga
Oddometer: 113
The forks do go up against the tank as there are no steering stops. I'm going to add them when I clean up the welds around the headstock. I'll try and get some pictures.
pvt joker is online now   Reply With Quote
Old 06-02-2013, 09:32 PM   #608
xt500nz
Adventurer
 
Joined: Mar 2013
Oddometer: 42
Quote:
Originally Posted by pvt joker View Post
The forks do go up against the tank as there are no steering stops. I'm going to add them when I clean up the welds around the headstock. I'll try and get some pictures.
thanks. pulling down the gearbox tomorrow, get the frame stripped and see what welds need grinding out for an attempt at rake reduction!
xt500nz is offline   Reply With Quote
Old 06-17-2013, 04:38 PM   #609
johnclaude
n00b
 
Joined: Nov 2009
Location: Iowa
Oddometer: 9
1978 XT500 dies around 45 mph

Hey guys,
I'm having a bit of an issue with my 1978 XT500. It starts fine and runs fine at lower speeds. However, if I take it up to 45-50 mph (in 3rd/4th gear) for an extended period of time eventually it will sputter and surge a little bit, and then die. Can anyone shed some light on the issue? I don't know where to begin. This is my first bike. I would appreciate any help. Thanks!

-John
johnclaude is offline   Reply With Quote
Old 06-17-2013, 04:41 PM   #610
jungleplant
Motorcyle Stuff
 
jungleplant's Avatar
 
Joined: Jul 2009
Location: ManRacks, California
Oddometer: 1,842
Quote:
Originally Posted by johnclaude View Post
Hey guys,
I'm having a bit of an issue with my 1978 XT500. It starts fine and runs fine at lower speeds. However, if I take it up to 45-50 mph (in 3rd/4th gear) for an extended period of time eventually it will sputter and surge a little bit, and then die. Can anyone shed some light on the issue? I don't know where to begin. This is my first bike. I would appreciate any help. Thanks!

-John
leaning out because float bowl gets empty, maybe
__________________
1-855-ManRack
http://www.manracks.com
jungleplant is offline   Reply With Quote
Old 06-17-2013, 05:37 PM   #611
BIG ED XT FAN
Beastly Adventurer
 
BIG ED XT FAN's Avatar
 
Joined: Feb 2006
Location: Finger Lakes Western New York
Oddometer: 1,184
Cry XT500 no Go?

Quote:
Originally Posted by johnclaude View Post
Hey guys,
I'm having a bit of an issue with my 1978 XT500. It starts fine and runs fine at lower speeds. However, if I take it up to 45-50 mph (in 3rd/4th gear) for an extended period of time eventually it will sputter and surge a little bit, and then die. Can anyone shed some light on the issue? I don't know where to begin. This is my first bike. I would appreciate any help. Thanks!

-John
Check the following: Gas cap, coil is not loose, have a new condenser points are new, theres no wires are rubbing on the frame, the key switch is not loose, wire are plug in good. The wires are over 30 years.
also check the rubbber intake has no cracks in it. Good Luck!!
BIG ED XT FAN is offline   Reply With Quote
Old 06-17-2013, 05:41 PM   #612
jungleplant
Motorcyle Stuff
 
jungleplant's Avatar
 
Joined: Jul 2009
Location: ManRacks, California
Oddometer: 1,842
ok try this get out on a dirt road and when it happens shut the gas off pull the clutch in , stop and see if you have any gas in the float bowl
__________________
1-855-ManRack
http://www.manracks.com
jungleplant is offline   Reply With Quote
Old 06-17-2013, 08:37 PM   #613
vudu
Gnarly Adventurer
 
vudu's Avatar
 
Joined: Jul 2009
Location: southern sydney, au
Oddometer: 187
Fuel Starvation? Check the fuel cap vent. I've seen a wasp nesting in the end of the vent tube. Good Luck.
vudu is offline   Reply With Quote
Old 06-18-2013, 09:56 AM   #614
johnclaude
n00b
 
Joined: Nov 2009
Location: Iowa
Oddometer: 9
Thanks for the replies Ed, jungleplant and vudu. I will check those things and report back. I'm gonna clean the carb today also.
johnclaude is offline   Reply With Quote
Old 06-18-2013, 03:33 PM   #615
johnclaude
n00b
 
Joined: Nov 2009
Location: Iowa
Oddometer: 9
Thanks for the help guys! Turns out the fuel vent hose from the gas cap was wedged up against the under bracket which might explain the fuel cutting out at higher speeds. Runs fine again. I might be an idiot....
johnclaude 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 09:48 PM.


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