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Discussion in 'Thumpers' started by onaXR, Jan 18, 2006.

1. ### ThumpnRedPig Wrangler

Joined:
Aug 30, 2009
Oddometer:
2,621
Location:
Eye Duh Hoe
Wikipedia? :huh
2. ### ONandOFF¿to post or to ride?

Joined:
Aug 8, 2009
Oddometer:
8,127
Location:
Shenandoah Valley riding wonderland
It's a bit more than a basic introductory lesson, but if you leave current densities and dot products for later study, you can work to take home the basic understanding that: the current, measured in amperes, is directly proportional to the potential difference, measured in volts, between two ends of (across) a resistor (or other ohmic device), and inversely proportional to the resistance, measured in ohms. That "aha" moment is the beginning of the comprehension of the volt and amp.
One can conjure a rough analogy of the volt as water pressure (units pounds per square inch) and the amp as water flow (units gallons per second) with a good imagination.
I hope that helps.

Joined:
Apr 30, 2008
Oddometer:
7,546
Location:
Cypress, Tx

4. ### RedclayriderLong time gone

Joined:
Oct 28, 2012
Oddometer:
1,138
Location:
Way down in the southern lands

Ohm's law homey.
5. ### bwalshLong timer

Joined:
Jan 15, 2009
Oddometer:
13,123
Location:
Helltown
I was going to join until I found out they didn't serve liquor.

May not be the problem. When mine started acting up I bought a CDI. Didn't cure it. I tested the coil and it wasn't giving me the correct reading so I replaced it. The bike worked like a charm for about six months then started giving me "no start" fits again.
Now that I've cleaned the ignition cut off switch it fires up "right now"!

Still have that new CDI in my parts box...

I think a lot of the CDI problems may be do to the location of the CDI and where the bike is ridden. Smooth roads, trails verses rough rocky roads and trails where the CDI is getting jarred to death. Mine has a lot of miles on it but I haven't been on too many rough trails.
6. ### ThumpnRedPig Wrangler

Joined:
Aug 30, 2009
Oddometer:
2,621
Location:
Eye Duh Hoe
Put the CDI in the pocket of your favorite riding jacket, tool pack or whatever you always have with you when out on the trail. It sure beats walking! I have a spare in my my tool kit that goes with me every time the tires hit dirt.
7. ### Spud RiderLong timer

Joined:
Jun 15, 2008
Oddometer:
3,891
Location:
Idaho
I agree on all points. In particular, thanks for posting the good information regarding the engine stop switch.

Many bikes with AC-CDI systems use the engine stop switch to kill the engine by grounding the output from the CDI unit. These switches are open in the "run" position, and divert the CDI output to ground in the "stop" position. Therefore, if the engine stop switch gets dirty, it doesn't cause ignition problems, because these switches are solely designed to kill the engine.

However, the XR650L employs a DC-CDI unit. Looking at the XR650L wiring diagram, it appears the engine stop switch provides 12V+ to the CDI unit when it is in the "run" position, and kills the engine by disconnecting power from the CDI unit when it is in the "off" position. Therefore, if the engine stop switch gets sufficiently dirty, it will not provide enough DC power for the CDI unit to operate properly.

One needs to make sure the engine stop switch is clean, in addition to testing the ignition coil, pulse generator, and spark plug, before he assumes the CDI unit is bad.

Spud
8. ### tedmagnumTed_Magnum UK

Joined:
Dec 21, 2005
Oddometer:
159
Location:
Liverpool, UK
I have all day tomorrow to pull the bike electrics apart.

It's going to be an epic battle of emotions and head scratching.

Being English, I will consuming A LOT of tea as it is the only way to combat times of difficulty
9. ### LexLeroyChief Mansplainer

Joined:
Jan 2, 2011
Oddometer:
3,182
Location:
Lexington, KY
10. ### tedmagnumTed_Magnum UK

Joined:
Dec 21, 2005
Oddometer:
159
Location:
Liverpool, UK
Exactly !!!
11. ### mrfixit54016Wisconsin Dual Sporter

Joined:
Jan 19, 2008
Oddometer:
711
Location:
Hudson, WI
Fritz

If you still have this and it is complete, My brother could really use it. It would be his last ditch effort before spending the cash on a hydraulic clutch for his DR. PM a cost and how you would like payment.

Thanks

Joined:
Dec 10, 2006
Oddometer:
1,329
Location:
LaGrange, GA
Some here might advocate a bottomless pint of Guinness as a more soothing beverage.

Not me of course!
13. ### fritzcoincEnjoying my last V8

Joined:
Apr 30, 2008
Oddometer:
7,546
Location:
Cypress, Tx
Super, all it needs is a pivot pin. I'll get one fur it. Send me your info and of course post info on proposed trade item for Collective to pruse and approve. LOL
Pm me when you have time.
Fritz
14. ### fritzcoincEnjoying my last V8

Joined:
Apr 30, 2008
Oddometer:
7,546
Location:
Cypress, Tx
Skip the labor pains and just give me the baby.

Fix: Keep the kill switch clean for proper operation of the CDI unit as the kill switch is in the power feed to the CDI.
15. ### fritzcoincEnjoying my last V8

Joined:
Apr 30, 2008
Oddometer:
7,546
Location:
Cypress, Tx
Wait a minute! Stop the music!
Your bro. is not liking his DR's clutch? :huh Those things have a clutch pull like a single hole paper punch. Go over there and clean and lube the lever and cable first.
16. ### techforlifeCDI REPAIR

Joined:
Sep 21, 2008
Oddometer:
4,393
Location:
Moncton,New Brunswick
Shut the hell up Fritz.........FFS.......you are one freekin lousy salesman..

You are supposed to tell them AFTER you sell them something they don`t need..

I see why you are so poor now,geeeezzzzzzzzzzzussssss

B

Joined:
Mar 6, 2013
Oddometer:
53
Location:
Midway Louisiana
Fritz, what kind of ds riding you have around there ? Ya'll ever get up any rides in your area ?
18. ### mrfixit54016Wisconsin Dual Sporter

Joined:
Jan 19, 2008
Oddometer:
711
Location:
Hudson, WI
He is weak and has girly hands and works for a software company. But at least he tries to ride.
19. ### SycklemotorBeen here awhile

Joined:
Jul 2, 2007
Oddometer:
206
Location:
Eureka, Missouri
I recently purchased a 2007 XRL that I plan to tear down to the frame and build a new bike my way.I have purchased the Emig triple clamps and a set of 2003 CRF450R forks. What I'm wondering is if anyone on the forum has advice for fork set up. My intention was to rebuild the fork but I am unsure about spring rates etc.
Any help/advice would be greatly appreciated.
I will also be selling off the stock front end,wheels, bodywork,tank,speedo- just about everything but the frame and motor. If anyone has interest you can call me at 314-277-8744. I will be listing those in the classifieds soon.
20. ### MeroBeen here awhile

Joined:
Feb 9, 2013
Oddometer:
308
Location:
Olympia, WA
Try racetech.com they're good guys

Samsung Galaxy S3