Strobe lights and a little misfire - Triumph Forum: Triumph Rat Motorcycle Forums
» Main Menu

Discussion Forums
 » Twins
 » Tiger
 » General
 » RAT

Features
 » Blogs

Motorcycle.com Links

Contribute
 » Photo

Motorcycle Forums
» Insurance
» Sponsors
» Our Partners
»ATV Reviews
»Motorcycle Games

Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

Reply
 
LinkBack Thread Tools Display Modes
Old 12-02-2012, 03:35 PM   #1 (permalink)
Senior Member
Powerbike
Main Motorcycle: 1978 Triumph 750 Tiger
 
tommytiger's Avatar
 
Join Date: Mar 2012
Location: Derby
Posts: 356
Other Motorcycle: Trident 900
Strobe lights and a little misfire

I was intrigued to see how the points set up on my was behaving so I have splashed out on a strobe light, it's an 'accuspark' , under 14 from fleabay and I can say I am very impressed by it!

It has revealed a few things to me,

1. My timing which I set statically is spot on where I thought it should be (about 36BTDC fully advanced to help it cope with modern fuels.
2. The AAU is working perfectly.
3. Both cylinders are firing at the correct time relative to each other.
4. I appear to have a little misfire on my left cylinder!!!!

The bike starts and ticks over well but when I checked the timing I I held the rpm at around 3000rpm and noticed that every 3 or 4 seconds on the left cylinder the timing 'jumped' a little and this coincided with a little faint misfire noise from the exhaust so little I'd not really noticed before, it was only the light that highlighted it to me.

I'm thinking, clean the point, and then start swapping ignition components until the fault transfers to the other side?

The plugs and leads are nearly new so I'm suspecting the condensor or coil.
tommytiger is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 12-02-2012, 05:55 PM   #2 (permalink)
Senior Member
SuperSport
Main Motorcycle: 1978 Bonneville T140V
 
Morris the Cat's Avatar
 
Join Date: Feb 2008
Location: Farmington,Connecticut
Posts: 1,010
Make sure your not using the bikes battery for this test!

This is rule # 1 in the Triumph bible, at least it was when these were new.


Don't know what happens if you break the rule though. . .
__________________
http://farm3.staticflickr.com/2880/9419068358_fe3bbd6508_t.jpg
Morris the Cat is offline   Reply With Quote Quick reply to this message
Old 12-02-2012, 07:06 PM   #3 (permalink)
Moderator
Team Owner
Main Motorcycle: Rickman T120
 
Join Date: May 2010
Location: Victoria Australia
Posts: 4,412
Other Motorcycle: T160,TR6
Try swapping the spark plugs.A bad plug will do that.
Mr.Pete is online now   Reply With Quote Quick reply to this message
Old 12-03-2012, 05:20 PM   #4 (permalink)
Lifetime Premium
Site Supporter
Formula Extreme
Main Motorcycle: T100R Daytona special
 
Join Date: Mar 2010
Location: The Land of Oz
Posts: 828
Other Motorcycle: Ducati 748/853
Extra Motorcycle: Cagiva Mito
Quote:
Originally Posted by Morris the Cat View Post
Make sure your not using the bikes battery for this test!

This is rule # 1 in the Triumph bible, at least it was when these were new.


Don't know what happens if you break the rule though. . .
My vane VT-440 timing light won't work unless I use the bikes battery.
.
Old Cafe Racer is online now   Reply With Quote Quick reply to this message
Old 12-03-2012, 05:30 PM   #5 (permalink)
Senior Member
SuperSport
Main Motorcycle: 1978 Bonneville T140V
 
Morris the Cat's Avatar
 
Join Date: Feb 2008
Location: Farmington,Connecticut
Posts: 1,010
Quote:
Originally Posted by OCR
My vane VT-440 timing light won't work unless I use the bikes battery.
Try a different timing light then?

Quote:
vane VT-440 timing light
not sure what that is?

Google no help. . .

__________________
http://farm3.staticflickr.com/2880/9419068358_fe3bbd6508_t.jpg

Last edited by Morris the Cat; 12-03-2012 at 05:35 PM.
Morris the Cat is offline   Reply With Quote Quick reply to this message
Old 12-04-2012, 06:36 AM   #6 (permalink)
Lifetime Premium
Site Supporter
Formula Extreme
Main Motorcycle: T100R Daytona special
 
Join Date: Mar 2010
Location: The Land of Oz
Posts: 828
Other Motorcycle: Ducati 748/853
Extra Motorcycle: Cagiva Mito
Why would I try a different timing light when the one I have works perfectly as designed on the vehicles own battery?
A modern strobe has a power smoothing input circuit which filters any AC pulses from the input power supply.
Those instructions were written a long time ago I would suggest.

.

.

Last edited by Old Cafe Racer; 12-04-2012 at 06:39 AM.
Old Cafe Racer is online now   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Strobe light. tommytiger Classic, Vintage & Veteran 7 10-19-2012 05:30 AM
Strobe? Santalum Classic, Vintage & Veteran 6 02-17-2011 01:04 PM
? about strobe timing tobydmv Classic, Vintage & Veteran 4 02-11-2011 02:04 PM
Strobe timing paul lavery Classic, Vintage & Veteran 20 05-15-2010 11:04 PM
Strobe Effect? brolane Biker Hang-Out 16 01-29-2007 08:08 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 12:31 AM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum HD LiveWire Forum Ninja H2 Forum Ducati Scrambler Forum

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.