lurch
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Posts: 217
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Post by lurch on Jun 26, 2006 11:19:32 GMT -5
Hi Guy's Here's my first question  The SR400 that i have just acquired wont start ,it seems to have too many sparks at the plug ,a constant stream of big fat juicy sparks just by pushing the kick start by hand a few inches . does anyone know what i should check ? I have cleaned all the connections from the alternator /magneto & the CDI unit .I only have the earlier version of the Haynes manual & it doesn't really cover the electronic ignition system . whats the procedure for checking the stator windings & and CDI unit with a ohms meter . I'm desperate to hear this motor run before i tear it down and throw time & probably money at it I think i have the basics for a very nice cafe racer project Thanks in advance ;D Lurch |
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Post by sjef on Jun 26, 2006 15:14:15 GMT -5
hallo lurch, here is a schematic drawing  hope this will help you sjef |
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lurch
Full Member
Posts: 217
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Post by lurch on Jun 29, 2006 3:02:29 GMT -5
Thanks sjef
I'm not very good at electrics so i have trouble following Schematic drawings ,my buddy ,who is my guide when it comes to bike electrics is in hospital at the moment recovering from a very serious bike accident so I'm asking for a little more help ;D
first ,on the CDI unit there are 2 connector blocks ,1 has 5 wires red,brown, black,white/red,white/green
the other has 3 wires ,black,orange,black/white
Can any one advise what wires i should test ? eg between red & brown or black & green /white with the ohms readings
I'll try the CDI first then go onto the sator windings if i have to.
Many thanks
Lurch
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Post by wotavidone on Jun 29, 2006 20:14:51 GMT -5
The question is, are the SR400 and SR500's wired the same?
If they are, then you might be able to get somewhere as below.
If you go to the SR500 Links section of this forum, you will find links to an SR500 manual.
In the Electrical section of this manual, you will find a very useful description of what wires do what.
I believe the three pin connector is the three phase charging stator. Looks too simple to be your problem.
I think you will find the 5 pin connector is associated with the CDI, and it gives you the OHM readings for each pair of those. The CDI colours appear the same as yours.
In the 500 at least, the bit that goes under the flywheel is simply a collection of coils of wire. If you get OHMs readings like those mentioned in the manual, then the unit is probably good.
I reckon I would do each and every test before jumping to any conclusions at all, and if I found a suspect part, I would try to borrow a known good one before shelling out the bucks to replace it. Looking at the diagram of the rectifier unit for instance, I'd be cautious about buying a new unit. Looks to me like the whole lot could be whipped up by your local electronics buff for about a fivers worth of parts.
But that brings us to the CDI unit itself. Not a lot of published info for these little beasties. There is a KIWI mob who advertise them on E Bay for $195 Australian. I'll see if my manual at home has any tests that can be done.
Hope you get somewhere.
Mick
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Post by sjef on Jun 30, 2006 14:30:34 GMT -5
hallo Lurch
impuls coil between white/green and black 90 ohm
ignitiontiming coil white/ red and black 16 ohm
coil brown and black 330 ohm
capacitorcharge coil red and brown 5ohm
all measured at the connector without the cdi
all measures at roomtemp +/- 20%
the black wire on the cdi is ground
the black/white is killswitch
the orange is for the ignition coil
ignition coil is prim 1ohm sec 12kiloohm (tandspole)
asuotani in japan sells programmable cdi for sr and other bikes just plug in and play
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Post by wotavidone on Jul 2, 2006 19:57:03 GMT -5
My shop manual was not all that helpful. It just says do all the coil check's as per sjef's post, then if there is no problem there replace the CDI. Programmable CDI would be great, wouldn't it?
Mick
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lurch
Full Member
Posts: 217
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Post by lurch on Jul 5, 2006 13:10:58 GMT -5
Hey All the Guy's that answered this question a big THANKYOU ;D All the sator values measured within tolerance ,I have replaced the ignition coil with a new one & a new spark plug .So I think it must be the CDI unit ,I have located one in a breakers yard so should be with me in a few days ,fingers crossed that it'll fix my problem  just cant wait till i hear the thumper THUMP  I'll keep you all posted thanks again LURCH |
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Post by sjef on Jul 5, 2006 14:57:32 GMT -5
lurch ,
keep in mind that there are 3 different stator/cdi combo`s none of them are interchangeable, if your cdi is from a 2j4 and your bike is a 2j2 or 2j4 you should be oke.
sjef
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Post by davedunsboro on Jan 8, 2007 9:09:20 GMT -5
Has the rotor been taken off at any stage ? the key has a tendancy to break off if its not tapped very firmly when reinstalled . This will give a spark but in the wrong place ? I've been caught twice on this, first on a SR500 then on a XT550 , both times after a repair job!
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Post by andy on Jan 8, 2007 14:20:48 GMT -5
hi lurch,i'm in leicester just down the M69,I have a spare cdi thats fine,get in touch if you want to borrow it to test out your theory.regards andy
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Post by sjef on Jan 8, 2007 16:37:59 GMT -5
hall lurch,
if your sr400 is a pre-93 a 2j2/4CDI should do
regards sjef
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Post by yamatopdog on Jan 8, 2007 18:44:46 GMT -5
Lurch,if you are geting good spark,i woud'nt be looking at your electronics.check the timming of the spark(shered key,ect) fuel,compression.if you have hot spark at the right time that's not the problem. just my 2 cents,Bob
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lurch
Full Member
Posts: 217
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Post by lurch on Feb 8, 2007 8:38:50 GMT -5
hi lurch,i'm in leicester just down the M69,I have a spare cdi thats fine,get in touch if you want to borrow it to test out your theory.regards andy Hi Andy Sorry mate just read your post The problem has been sorted out .bought a s/h cdi off ebay £25 .I just wanted to hear the bike run before i tore it apart for the cafe racer project . its been lying in a farmer barn in the cotwolds for the last 7 years since the cdi packed up . should be completed by the end of spring, finances permitting spent a fortune on her so far rolling chassis nearly finnished should start on the motor soon . Sjef Thanks mate ,I did use the cdi from a early SR500 cant get at the bike right now but i think the number on it ended with -50 ,theres another cdi used I think that the number ends with -35 do you know if this cdi will work with my ignition system ? like what cdi goes with what pick up /altenator windings Thanks LURCH |
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Post by sjef on Feb 8, 2007 11:39:46 GMT -5
Hallo Lurch,
As far as i know till 1983 CDI nippo denso nr 07000-035
from 1984-1992 07000-0510
from 1993 0n 07000-2430
best regards
sjef
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lurch
Full Member
Posts: 217
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Post by lurch on Feb 9, 2007 4:14:50 GMT -5
sjef I got a little confused with the CDI numbers ,the module has 3H1-50 on the label but also 070000-0510 written underneath Going by the info you've supplied the CDI is a 84-92 model but the 400 is registered as a 79 model Hmm even more confused  Is there a serial number stamped on the alternator windings ? I was going to use the alternator & cdi unit from the 400 on the yet to be built 500 motor as i know that the ignition works or at least it does just blipping the throttle ,haven't rode the bike . The 400 motors engine number is just 2H6 and the 500 reads 2J4-007390 do you or anybody know what year these numbers relate to ? Many thanks LURCH |
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just cant wait till i hear the thumper THUMP 
