Deep breath, Dive! (GSX400X Impulse)

[Eddieb]

Any Suzuki 400cc coil from that era should work, google whether the 750 or rgv250 ones might do also.

I found with my GSXR400F that the coils suffered from heat issues, when the bike got hot they would start to fail and once the bike sat for 10 minutes they would work fine again. If you can work out some way of keeping them cooler that should extend their life somewhat.

[Drew]

No?

That's a damn shame! I need to find out what differences there are between ignition coils from one manufacturer to the other... Having trouble tracking down that kind of info online.

Any Suzuki 400cc coil from that era should work, google whether the 750 or rgv250 ones might do also.

I found with my GSXR400F that the coils suffered from heat issues, when the bike got hot they would start to fail and once the bike sat for 10 minutes they would work fine again. If you can work out some way of keeping them cooler that should extend their life somewhat.

They need to come from a four stroke twin or four cylinder. RGV is single outlet, where the multi (multi cylinder four stroke) runs a wasted spark system. One coil for no. 1 and 4 cylinder, the other for 2 and 3.

Nearly any coils from the same era will work, CBR or FZR even, it's all the same.

Have you tested for signal at the coil? The wire that goes back to the CDI (ignition box) should be earthed most of the time, and then not earthed when the rotor passes the pulse coil at the crank sensor. Usually need an oscilloscope to test that.

I've had problems with the old Suzuki multi in the past, where the magnet in the pulse generator (Hall effect sensor I think they're called) was broken and it didn't work proper.

Once you have diagnosed and sorted your spark issue, you are going to have to enjoy the fun that is the carbs (carburetors) on the Impulse. There are endless hours of fun to be had, trying to eliminate the air leaks on the airbox side of the carbs. It WILL NOT run right until you have fixed that, and I promise you WILL HAVE TO sort it as I've never seen one without buggered rubbers.

The standard battery on a lot of the earlier Suzukis, must have been an odd size they specified or something. People can only seem to get slightly taller ones, and they often mean the airbox bolts get undone to allow it to move up a bit. Dunno about the Impulse on that score, but if it's the case just shell out proper dollars for a LiPO4 battery as they are way smaller.

[Akzle]

...should be earthed most of the time, and then not earthed when the rotor passes the pulse coil at the crank sensor. Usually need an oscilloscope to test that.

can be seen on an LED test light as they have ridiculously small rise requirement.
Regular test lamp, no.

[bogan]

Update - 21/02/14

So I managed to do some further diagnosis today after watching this youtube video:


Basically I mucked around and diagnosed that there was a connection across the positive/negative of the primary coil but there was NO resistance to the secondary coil... Basically from the coil to the spark plug there was nil/nada/nothing... On both coils!

I've tested and tested and tested using the technique from the vid but still nothing... Looks like I could use two new ignition coils that will work with my bike! Anyone got any suggestions/parts to sell?

If you want a double check on your testing method before getting too into looking for coils (with both show bad reads it could be test method or something else) I can probably pop out this weekend.

[Akzle]

there was NO resistance to the secondary coil...

there shouldnt be? You know how coils work?

no resistance? Or infinite resistance= no continuity?

If theres no resistance, theyre fucked.

[gammaguy]

I have manuals parts and all sorts for a GK71E
You know what to do

[Reubix]

there shouldnt be? You know how coils work?

no resistance? Or infinite resistance= no continuity?

If theres no resistance, theyre fucked.

Yep, they're knackered.

Just bought 2x CB900 coils off TM

[buggerit]

Interesting to have both coils fail, makes you think doesnt it

[Reubix]

Interesting to have both coils fail, makes you think doesnt it

Aye, it does. A common fault with this model though... I'm thinking of putting together an extra bracket and using some heat-shrouding material to increase their longevity.

[Drew]

Aye, it does. A common fault with this model though... I'm thinking of putting together an extra bracket and using some heat-shrouding material to increase their longevity.

Coils tend to get warm of their own efforts, wrapping them could cause more problem than it's worth.

[Reubix]

Coils tend to get warm of their own efforts, wrapping them could cause more problem than it's worth.

Noted! Cheers for the tip!

Will just do the bracket/head shield idea rather than shroud the whole thing. Thanks for your input

[Akzle]

cowling and ducting. Air nigger. Git' mo' air.

[F5 Dave]

Haven't bothered reading full thread 'cuz I'm lazy. Dual coils test out a bit diff from single ones. The CB ones will school you up to what's normal. As an aside people do some silly things like replace spark lead with car type silicon stuff. Also take off the plug caps & test each one separately. Should be ~5-8k each.


Typical of this model the Reg rec goes. voltage spikes to 18 or so volts which boils the battery, kills the headlight bulb, burns out the alternator (as low oil level will) and worse kills the CDI which for want of an internal regulator is a common failing on these. Aftermarket ones are available.

As Drew sez pay attn to carbs. I have one of these to dig into for an old friend. Same engine setup as a GK76 GSXR400 or something. I've put it off a few years but I promised her I'll fix it up one day. No hurry.

[RDjase]

http://www.400greybike.com/

http://www.400greybike.com/forum/vie...0d93adb37e3349

Maybe a manual in here somewhere

http://www.400greybike.com/forum/vie...php?f=53&t=164

If you find one that works give me the link, I have got a Impulse for my son, its on the back burner though

[RDjase]

http://www.carlsalter.com/motorcycle-manuals.asp