ADVrider

Go Back   ADVrider > Bikes > Old's Cool > 2 smokers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-17-2013, 11:31 AM   #1
Vankaye OP
n00b on the move
 
Joined: Mar 2009
Location: TampaBay
Oddometer: 212
1980 YZ250 Lots of new parts - still no spark

Hi, I am trying to source the electical specs for a 1980 Yamaha YZ250.

I've scoured the interwebs and couldn't find fuck-all... so I thought I would ask you guys.

I'm specifically looking for the testing specs for the stator and coil.

I have restored this bike and it ran great for quite a while but suddenly started losing spark intermittently.
I bought a new coil (brandnew) and plug and cap. Didn't help.
I replaced the stator with a really pretty specimen I found on Ebay but I suddenly have no spark at all.

I am looking for test specs so I can test the used stator I got and of course I should probably also see what kind of resistance the new coil is showing.

Here are some before and after of the restoration:





Vankaye is offline   Reply With Quote
Old 03-17-2013, 11:44 AM   #2
k-moe
Beastly Adventurer
 
Joined: Jun 2012
Oddometer: 2,394
Shop manuals are worth every penny spent. http://www.servicerepairmanualonline...stroke-manual/
k-moe is offline   Reply With Quote
Old 03-17-2013, 12:33 PM   #3
Vankaye OP
n00b on the move
 
Joined: Mar 2009
Location: TampaBay
Oddometer: 212
Quote:
Originally Posted by k-moe View Post
Shop manuals are worth every penny spent. http://www.servicerepairmanualonline...stroke-manual/
I agree. I have the Clymer manual for the bike but there doesn't seem to be any resistance specs.

The whole bike is rebuilt. I would never attempt that without a manual. Not trying to be a wise-guy, just trying to pre-qualify myself.
Vankaye is offline   Reply With Quote
Old 03-17-2013, 01:00 PM   #4
Scootern29
Gnarly Adventurer
 
Scootern29's Avatar
 
Joined: Sep 2012
Location: In the hot, hot, dezert
Oddometer: 466
From experience, I would bet it is the CDI box.
Scootern29 is offline   Reply With Quote
Old 03-17-2013, 01:17 PM   #5
pvangel
Team AARP
 
Joined: Sep 2005
Location: South Salem, NY
Oddometer: 2,325
I agree with the black or CDI box, that is the most common failure on these vintage bikes, I went through a bunch on my 1980 rm 125 until I couldn't find them any more...PVL ignitions is the only way to go but it's about $500 for the setup. The biggest forum on these bikes is www.vintagemx.us that I know of, ask away and you will get answers right away!
pvangel is offline   Reply With Quote
Old 03-17-2013, 01:23 PM   #6
pvangel
Team AARP
 
Joined: Sep 2005
Location: South Salem, NY
Oddometer: 2,325
PVL does make one for your bike, http://www.pentonracingproducts.com/pvl.htm

Didn't see pricing there but $519.00 on another site.
pvangel is offline   Reply With Quote
Old 03-18-2013, 05:11 PM   #7
kbasa
Colnago!
 
kbasa's Avatar
 
Joined: May 2002
Location: Marin County, California
Oddometer: 66,045
Moved to 2 smokers.
__________________
IMHO.

Fuck Cancer. Ride bikes. - dave + tina
kbasa is offline   Reply With Quote
Old 03-21-2013, 04:16 PM   #8
wfopete
Suffer Fools; Gladly!
 
wfopete's Avatar
 
Joined: Aug 2004
Location: Somewhere North of Dover, AR
Oddometer: 444
Hmmm. Fresh resto? Might want to check your grounds.
__________________
Suffer Fools; Gladly!....

RIDING the TAT? CHECK IT OUT:

TAT SHAK
wfopete is offline   Reply With Quote
Old 03-21-2013, 07:46 PM   #9
Scootern29
Gnarly Adventurer
 
Scootern29's Avatar
 
Joined: Sep 2012
Location: In the hot, hot, dezert
Oddometer: 466
He has already had the bike running and it progressivly lost spark. I doubt it is the grounds.
Scootern29 is offline   Reply With Quote
Old 03-21-2013, 08:19 PM   #10
Grreatdog
Beastly Adventurer
 
Grreatdog's Avatar
 
Joined: Apr 2007
Location: Annapolis, MD
Oddometer: 9,927
Have you checked the kill switch? Back in 79 we spent a couple of hours working on my friend's DT175 because it suddenly lost spark and died on the trail. We finally either jumped or disconnected the kill switch and it fired right up.
__________________
640E, MXC200, XT200
Grreatdog is online now   Reply With Quote
Old 03-21-2013, 08:38 PM   #11
Foot dragger
singletracker
 
Foot dragger's Avatar
 
Joined: Dec 2006
Location: chico,just below rag dump(nor-cal)
Oddometer: 12,788
looks like a fun bike once its sorted,I just lucked into one the other day.
Its a 1976 Montesa 250 enduro,saw it on craigslist,called the guy,loaded the dog and loading ramp and zipped up and got it quick like.

The guy said it ran,turns out the engine is rebuilt and sounds like new,frame has fresh powder coat,new SS spokes,new square Amal carb all dialed in,new oem fenders,cad plated bolts,pretty much all stock except the carb,even stock bars from 76.
Ive been doing wheelies around the back yard,the thing starts quick and runs clean. It runs like a crisp Bultaco but shifts on the left side and kicks on the right.
I hate to say what I paid but it was way too cheap,way.
__________________
Some bikes around at times
Foot dragger is online now   Reply With Quote
Old 03-22-2013, 07:51 AM   #12
D.T.
One wheel wonder...
 
D.T.'s Avatar
 
Joined: Aug 2004
Location: Moneyapolis, MN
Oddometer: 9,662
Nice job!

I'd like to find an old YZ or IT to fix up.
__________________
Quote:
Originally posted by burgerking So?
Holland is about the most expensive country in Europe when it comes to bikes and fuel..Stop whining and go riding It's just money and you only live once...
D.T. is online now   Reply With Quote
Old 03-31-2013, 07:23 AM   #13
dentvet
Beastly Adventurer
 
Joined: Aug 2008
Location: hunt country virginia
Oddometer: 1,230
fun bike. try playing with the cdi, freeze it or try a heat gun. i had a tw200 that missed badly until i squeezed the box with my hand

dentvet is offline   Reply With Quote
Old 03-31-2013, 01:35 PM   #14
Twin-shocker
Beastly Adventurer
 
Joined: Jan 2012
Oddometer: 1,673
Most AC ignitions will work fine using AC pit bike CDI units, which can be found for less than $20 on Ebay. You need to sort out the correct pins of the PB CDI to connect to your OE wiring, but this is pretty easy, and a new Chinese CDI is better than taking a chance on a used part which might not work anyway.
Twin-shocker 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 07:41 AM.


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