Got The Holeshot
Arm chair racerJust too addicted
After 20 + years of working on automobiles----I have been stumped with a question about Ignitions on an ATV---Help???
Honda uses a Pulse generator on the camshaft, to determine TDC on Compression stroke, and times the spark accordingly---
Yamaha has only the rotor and stator---with nothing for a Camshaft reference,
Crankshaft revolutions are 2x the camshaft revs --so how does it determine which stroke to fire on????
Buy American! Unless your only option is a HARLEY.
A customer walked in to my shop and Impatiently stated "My car doesnt start, Whats the problem?"I responded with a smile-"Yep that sounds like your problem alright"----
At The Back Of The Pack
Arm chair racerAt the back of the pack
The timing advance rotor. (Rotor attached to cam) It has 2 sides, the one with the mark tells the spark plug to ignite, if you have it 180 out, no spark. I was stumped by this on my first rebuild, I double checked everything and no spark, finally in frustation I turned the rotor 180 and presto. I guess when I removed the rotor from the timing advance assembly to clean it and check the springs I put it back together backwards, not knowing there was a particular way it went. I thought it was a no brainer being the cam has a pin that can only attach to the timing advance assembly one way. Forgat that the rotor has 2 sides.
Got The Holeshot
Arm chair racerJust too addicted
Exactly---Thats a honda---
Yamaha has NOTHING cam related----its all done at the crankshaft---I know it works -cuz our trikes run- But Im stumped---
Buy American! Unless your only option is a HARLEY.
A customer walked in to my shop and Impatiently stated "My car doesnt start, Whats the problem?"I responded with a smile-"Yep that sounds like your problem alright"----
At The Back Of The Pack
Arm chair racerAt the back of the pack
I sorry I thought you meant in general, I had a Yamaha once, honestly could never get it running right so I gave up and parted it out to raise money to fix my Honda. Not that I am saying one is better than the other, I just have no experience or luck with the Yamaha's.
Got The Holeshot
Arm chair racerJust too addicted
I was helping someone "Time -UP" a 185s pulse rotor--when I realized that 4 stroke yammys dont have anything that looks like this-----------My trike is a 2 stroke--so no luck checking there--Im just at a loss here---LOL
Buy American! Unless your only option is a HARLEY.
A customer walked in to my shop and Impatiently stated "My car doesnt start, Whats the problem?"I responded with a smile-"Yep that sounds like your problem alright"----
At The Back Of The Pack
Arm chair racerAt the back of the pack
I think the pulse generator is aligned next to the flywheel like in my 250sx or my sons trx 70 not really sure how it tells the difference in the strokes though maybe the exciter coil or cdi ?
Power User
Lord of the trike
Who says it has to only spark on the compression cycle? Why not have it have it spark on compression and exhaust strokes?
1984 Yamaha YT 60 Tri Zinger(current project)
1983 Yamaha YTM 200 (rear suspension kit)..... long term project
2004 BMW R1150R
1972 Honda CT 70
2007 Lifan 110
Got The Holeshot
Arm chair racerJust too addicted
--Touchdown---FOX
Waste spark------Like a Distributorless Ignition system-???
Buy American! Unless your only option is a HARLEY.
A customer walked in to my shop and Impatiently stated "My car doesnt start, Whats the problem?"I responded with a smile-"Yep that sounds like your problem alright"----
Registered User
Just too addicted
It may have a pulse generator winding on the stator, Ive seen some small motorcycle engines that way. Look for two hot wires to the ignition plus a lights feed if it has lights. I doubt its wasted spark because CDi's need all the charge time they can get at higher revs.
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