Honda ATV Forum banner

1 - 20 of 30 Posts

·
Premium Member
Joined
·
23,581 Posts
Discussion Starter · #1 ·

·
Registered
Joined
·
1,285 Posts
wow. great read. so to get timing right you might have to use a resister. im curious tho, do different coils put out different timing curves???
 

·
Registered
Joined
·
1,285 Posts
or is the ignition pulled from the motorcraft ignition box. and if so i guess a different type of ignition box would yeild different timing curves.
 

·
Premium Member
Joined
·
23,581 Posts
Discussion Starter · #4 ·
Yeah, the timing would be built into the ignition box.
 

·
Registered
Joined
·
1,285 Posts
gotcha, so a different ignition box would yeild different timing curves. but he said that one already had alot of timing so i guess its enough.

man great read and find.
 

·
Premium Member
Joined
·
23,581 Posts
Discussion Starter · #6 ·
Yeah, I stumbled across it looking for something and I figured someone might be interested in it. You don't see too much information about the CDI on the internet.
 

·
Registered
Joined
·
1,963 Posts
Yeah, I stumbled across it looking for something and I figured someone might be interested in it. You don't see too much information about the CDI on the internet.
Yeah it's usally just oem replacement.
 

·
Registered
Joined
·
1,285 Posts
i already sent him an email about this but figured i would ask yall too.

do different atv's have different timing curves??? like a utility maybe has more of a mid range timing curve and a race atv has more of a top end timing curve??

and do you think you could swap cdi boxes around from different atvs to achieve different timing curves??
 

·
Premium Member
Joined
·
23,581 Posts
Discussion Starter · #9 ·
i already sent him an email about this but figured i would ask yall too.

do different atv's have different timing curves??? like a utility maybe has more of a mid range timing curve and a race atv has more of a top end timing curve??

and do you think you could swap cdi boxes around from different atvs to achieve different timing curves??
I don't know that much about CDI's, other than a general ideal of what they do, but I'm sure different ATVs would have different timing curves.

As far as interchanging them, I would imagine it would work as long as you could figure out the wiring and get it right. I'm not sure if you could ever get one running exactly right or not, but who knows, maybe you could.
 

·
Premium Member
Joined
·
23,581 Posts
Discussion Starter · #11 ·
yea i was just curious if say i put a 300ex of 400ex on the 300 fourtrax what kind of power effect it would have.
I don't have any ideal, but I wonder about that too. I guess, the only way to know would be to try it.
 

·
Registered
Joined
·
1,285 Posts
yea, you got that right.

he might send me back an email on it and ill let yall know what he says.

i cant keep nothing stock :D
 

·
Premium Member
Joined
·
23,581 Posts
Discussion Starter · #13 ·
yea, you got that right.

he might send me back an email on it and ill let yall know what he says.

i cant keep nothing stock :D
I like keeping mine stock, but if I did change anything it would probably be the CDI.
 

·
Registered
Joined
·
1,963 Posts
i already sent him an email about this but figured i would ask yall too.

do different atv's have different timing curves??? like a utility maybe has more of a mid range timing curve and a race atv has more of a top end timing curve??

and do you think you could swap cdi boxes around from different atvs to achieve different timing curves??
I don't know that much about CDI's, other than a general ideal of what they do, but I'm sure different ATVs would have different timing curves.

As far as interchanging them, I would imagine it would work as long as you could figure out the wiring and get it right. I'm not sure if you could ever get one running exactly right or not, but who knows, maybe you could.
Would it spark when it was supposed to?
 

·
Premium Member
Joined
·
23,581 Posts
Discussion Starter · #16 · (Edited)
i already sent him an email about this but figured i would ask yall too.

do different atv's have different timing curves??? like a utility maybe has more of a mid range timing curve and a race atv has more of a top end timing curve??

and do you think you could swap cdi boxes around from different atvs to achieve different timing curves??
I don't know that much about CDI's, other than a general ideal of what they do, but I'm sure different ATVs would have different timing curves.

As far as interchanging them, I would imagine it would work as long as you could figure out the wiring and get it right. I'm not sure if you could ever get one running exactly right or not, but who knows, maybe you could.
Would it spark when it was supposed to?
Yeah, it should, the pulse generator or pick up coil is what triggers it when to fire, then the CDI circuitry advances it according to engine RPM and that's what makes your timing curve.

If you use the wrong CDI with the wrong timing curve, then the firing would be off a little bit. That would be the trick to it, finding the right CDI with the right timing curve. With the wrong CDI, it would probably run, but not run right, unless the timing curve was real close. But if the timing curve was off bad, it might not run.
 

·
Registered
Joined
·
1,963 Posts
I don't know that much about CDI's, other than a general ideal of what they do, but I'm sure different ATVs would have different timing curves.

As far as interchanging them, I would imagine it would work as long as you could figure out the wiring and get it right. I'm not sure if you could ever get one running exactly right or not, but who knows, maybe you could.
Would it spark when it was supposed to?
Yeah, it should, the pulse generator or pick up coil is what triggers it when to fire, then the CDI circuitry advances it according to engine RPM and that's what makes your timing curve.
Ok that makes sense. Then it could possibly hop up a quad pretty well.
 

·
Premium Member
Joined
·
23,581 Posts
Discussion Starter · #18 ·
Ok that makes sense. Then it could possibly hop up a quad pretty well.
I added some more to my previous post. Go back and read it and it will make a little more sense.
 

·
Registered
Joined
·
1,285 Posts
"One thing I noticed after using this ignition for awhile is that the battery runs down after a long period of low engine speed. I hooked an ammeter to it and found out that the charging circuit only puts out a small amount of power, something like 5 amps running the engine wide open. The ignition pulls about 2 amps, so you have to have the engine running about 1800 RPM before the thing charges the battery. So if you idle around a lot like I do, that is kind of a problem. One thing that worked on this engine that I figure is the same on most of them is that the original cdi box had a separate coil in the engine to power it. I checked the voltage and current coming from it, and it was a pretty high voltage but not much current. I took the coil out of the engine and found that it was wound with a lot of turns of small gauge wire. I rewound it with a slightly larger gauge than the charging coil was wound with and put as many turns on it as I could without causing it to rub. I put an old diode out of a Chevy alternator on it and connected it to the battery. Now at idle the 2 charging coils put out enough power so that running the original headlight, the ignition, and a pair of 35w halogen lights on it puts about .03A into the battery at idle. Anything above idle puts a good charge into the battery. Now I should be able to run about anything else I want and have the power to keep the battery charged."


would the 300 have something like this set up???

it would be nice to get some more charging power. i dont know if thats the issuies with my lights or its because i dont have a battery on it yet but there pretty bright at idle (plenty good) but once i take off they loose i say atleast half there power. wondering if there was a way i could amp up the power to them.
 

·
Registered
Joined
·
2,702 Posts
Geez where have you been? LOL seems like forever since you posted.. anyhow.. your problem is FOR SURE the fact that you have no battery! Get a battery and go from there.
 
1 - 20 of 30 Posts
Top