ADVrider

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 08-02-2014, 07:54 PM   #1
shawshank9110 OP
shawboy
 
Joined: Aug 2014
Location: Nashville TN
Oddometer: 6
no spark

Ok. I bought a 77 triple. But has electronic ignition. I have replicated cdi, pickup coil, rectifier, and fuse box, and still no spark. Im going cross eyed looking at the wiring diagram chaseing wires because the guy I biught it from cut all wires that was once to the fuse box and direct wired them together. So mg question is, is there any stand alone ignition system to really clean up the bike and not have 10 miles of wire everywhere?
shawshank9110 is offline   Reply With Quote
Old 08-02-2014, 08:27 PM   #2
Danjal
Insert wit here.
 
Danjal's Avatar
 
Joined: Oct 2011
Location: Location,Location
Oddometer: 2,487
Got points on that thing?
Danjal is offline   Reply With Quote
Old 08-03-2014, 04:19 AM   #3
concours
WFO for 41 years
 
concours's Avatar
 
Joined: Dec 2008
Location: Kensington, NH USA
Oddometer: 5,261
Quote:
Originally Posted by shawshank9110 View Post
Ok. I bought a 77 triple. But has electronic ignition. I have replicated cdi, pickup coil, rectifier, and fuse box, and still no spark. Im going cross eyed looking at the wiring diagram chaseing wires because the guy I biught it from cut all wires that was once to the fuse box and direct wired them together. So mg question is, is there any stand alone ignition system to really clean up the bike and not have 10 miles of wire everywhere?
Hi, Welcome to the asylum. A triple WHAT did you buy? XS750 Yam? Trident? Sazook?
http://www.boyerbransden.com/micromarkiii.html
__________________
Too much is just barely enough.....

concours screwed with this post 08-03-2014 at 04:30 AM
concours is offline   Reply With Quote
Old 08-03-2014, 06:11 AM   #4
shawshank9110 OP
shawboy
 
Joined: Aug 2014
Location: Nashville TN
Oddometer: 6
It is titled as a 77 Yamaha xs750 but has electronic ignition as the 78 came with. So im guessing it is a latter model of the 77. And no, there is no points on my old gal. Is there any simpler way to get my ignition to work without all the other wiring bs? Im trying to really clean the wiring up being it is a bobber project.
shawshank9110 is offline   Reply With Quote
Old 08-03-2014, 01:36 PM   #5
shawshank9110 OP
shawboy
 
Joined: Aug 2014
Location: Nashville TN
Oddometer: 6
Eek

Recent update. Got new rectifier. So I plug it in and keeps blowing main fuse. Ugh. Im running out of ideas here. Any ideas?
shawshank9110 is offline   Reply With Quote
Old 08-03-2014, 04:46 PM   #6
concours
WFO for 41 years
 
concours's Avatar
 
Joined: Dec 2008
Location: Kensington, NH USA
Oddometer: 5,261
Tell us a bit about your skillset please... you have a DMM? Any experience with Ohm's law? Know how to measure resistance? This will help us know at what level to start.

Trying to unravel a horrible amateur bodge job can be a bigger challenge than any other.
__________________
Too much is just barely enough.....
concours is offline   Reply With Quote
Old 08-03-2014, 05:49 PM   #7
ttpete
Rectum Non Bustibus
 
Joined: May 2009
Location: Dearborn, MI
Oddometer: 5,507
Before you do ANYTHING, get your hands on a wiring schematic for that particular model. You'll be able to identify the wires by their color. Better yet, try to find a factory workshop manual. Google is your friend here. Chances are there will be a download. Look for forums that deal with vintage Yamahas.

Wiring problems are something that can't be addressed online except in a very general way because nobody can visualize them.
__________________
10 Ducati 1098 Streetfighter S - "Sleipnir"
09 Kaw Versys
67 Triumph Bonneville TT Special
"The problem with Socialism is that you eventually run out of other people's money" _____ Margaret Thatcher
ttpete is offline   Reply With Quote
Old 08-03-2014, 08:40 PM   #8
shawshank9110 OP
shawboy
 
Joined: Aug 2014
Location: Nashville TN
Oddometer: 6
Thank you for your replys. Yes I have a dvom. I have grown up working on cars with my dad since I was a kid. So yes I am pretty knowledgeable. What im having problems with is trying to figure out what the guy did before me. The wiring harness has been chopped to crap. I have damn near memorized the wiring diagram for this model of bike. I am half tempted to find a new wiring harness that has not been hacked on and work from that. I mean the one on it is a rats nest. Good or bad idea?
shawshank9110 is offline   Reply With Quote
Old 08-04-2014, 09:28 AM   #9
sailah
Lampin' it
 
sailah's Avatar
 
Joined: Aug 2005
Location: Turning expensive metal into scrap
Oddometer: 5,415
For $50 it would be worth it to me to start with a better unknown (ebay harness) than your complete unknown which is just frustrating. Get the bike running THEN start slimming down the harness. You're just throwing random darts right now, get the darts on target and start focusing on your aim.

Starting off with a complete rats nest is frustrating at best. I've done it. And I hear you about going blind on wiring diagrams. Do yourself a favor and get a decent harness that you are semi confident in. Start working down the line.

My favorite first place to test is with the kill switch to run are you getting 12v at the coils. If not, it's a much more basic problem. If you are you can then focus upstream on trigger reg rec problems.
__________________
We're not out here to rough it. We're here to smooth it . Things are rough enough in town.

Nessmuk
sailah is offline   Reply With Quote
Old 08-04-2014, 10:43 AM   #10
MotorradMike
MIL-TFD-41
 
MotorradMike's Avatar
 
Joined: Aug 2008
Location: Mallorytown Ontario
Oddometer: 997
I have a 1978 XS750 and a Haynes manual.
If you need pics of something specific, let me know.

Edit: The kill switch on mine was the cause of a very long intermittent engine quit scenario. Took a long time to find it.
__________________
Mike
So far, everything that has surprised me has been completely unexpected.

BMW R1100RS
MotorradMike is offline   Reply With Quote
Old 08-04-2014, 01:05 PM   #11
shawshank9110 OP
shawboy
 
Joined: Aug 2014
Location: Nashville TN
Oddometer: 6
Laugh

Quote:
Originally Posted by MotorradMike View Post
I have a 1978 XS750 and a Haynes manual.
If you need pics of something specific, let me know.

Edit: The kill switch on mine was the cause of a very long intermittent engine quit scenario. Took a long time to find it.
Thank you for the help. I may take you up on that. I just ordered a wiring harness today. Will keep everyone posted when I get it in and put on. Should be latter this week.
shawshank9110 is offline   Reply With Quote
Old 08-04-2014, 04:08 PM   #12
Danjal
Insert wit here.
 
Danjal's Avatar
 
Joined: Oct 2011
Location: Location,Location
Oddometer: 2,487
PO hack jobs suck. Been through that before. Your best bet is the wiring harness as said,or repairing everything you touch back to stock.
Danjal is offline   Reply With Quote
Old 09-08-2014, 02:32 PM   #13
shawshank9110 OP
shawboy
 
Joined: Aug 2014
Location: Nashville TN
Oddometer: 6
OK. Still no spark. Got a real nice harness and new kill switch. Still nothing. This thing is pissing me off. I'm about to sell the damn thing. Anybody have anymore ideas?
shawshank9110 is offline   Reply With Quote
Old 09-08-2014, 04:19 PM   #14
MATTY
ADV RIDER & DRIVER
 
MATTY's Avatar
 
Joined: Jun 2014
Location: THE BORDER ENGLAND
Oddometer: 225
Total shot in the dark here but is it the kill switch, there will be three wires in the kill switch two will be the coil feed that will suply coil. the other will be the starter solenoid wire.
Get continuity to the coil, join the coil feed wire to the power in and the solenoid wire continued to the starter button, it should start.
MATTY is offline   Reply With Quote
Old 09-08-2014, 05:58 PM   #15
k-moe
Beastly Adventurer
 
Joined: Jun 2012
Oddometer: 2,501
Have you checked the coils for proper primary and secondary resistance?

Have you checked the pickup coils for proper resistance?

Do you have a known-good TCI to swap for testing? While TCIs are durable, the capacitors do fail eventually, and solder joints can fail.

Have you checked the plug caps? They should be resistor caps, and the resistors can fail, or the retaining plug become loose.

Have you removed the plug caps and cut back the plug wires to eliminate corrosion?

Is the battery at full charge? Low voltage will spin the starter but not leave enough for the TCI.
__________________
Mixing metaphors is like killing two birds with a dog that won't hunt.
k-moe 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 12:13 PM.


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