cb500 four coil suppliers

[LesH]

I have suspect coil(s) !  Tried a coil swap over and continuity of wiring to points and still only get a very weak spark off one coil at 2 & 3 but nothing at 1 & 4 no matter what ! New points and condensers fitted. So am going to have to bite the bullet and get replacement coils if anybody can recommend a sensibly priced supplier or guide me as to what else may be going on would be much appreciated ? 

[hairygit]

I think you should check that you are getting power to the coils before spending out on new ones. Try running a live (+) feed to the coils power feed direct from the battery, as you may have dirty connections or intermittent breakdown of the live feed  from ign switch or handlebar kill switch feed to coils.

[LesH]

Thanks for that idea.   I'll give it a try tonight if and when I get the chance.

[AshimotoK0]

I have suspect coil(s) !  Tried a coil swap over and continuity of wiring to points and still only get a very weak spark off one coil at 2 & 3 but nothing at 1 & 4 no matter what ! New points and condensers fitted. So am going to have to bite the bullet and get replacement coils if anybody can recommend a sensibly priced supplier or guide me as to what else may be going on would be much appreciated ? 

http://www.sohc.co.uk/index.php/topic,10269.msg73700.html#msg73700

You know it makes sense!

[LesH]

Just returned from visiting Mrs in hosp so knackered.  Have to think about washing, feeding etc., Will now think I shall try these suggestions over w/e without so much pressure........... hopefully !  Thank you all.   

[Laverda Dave]

I bought a set from M&P, they are pattern parts though so if you want to keep it original use the Ash repair guide.

Just for info though, there was a previous thread on here about making sure pattern coils have a 4-ohm resistance if using electronic ignition systems as a number of pattern coils sold on e-bay are 2-ohm and will cause damage to the ignition system.  M&P told me their coils were 4-ohm, when I received them I checked to be on the safe side as I have a brand new Boyer system to go in 'project 400/4' and they were as described, happy days
Dave

[LesH]

Thanks for info Dave.  I have used M & P before so I do trust them and as you've tried and tested their coils that's another option open.  May well do that after reading 11 pages Ash's coil rebuild it left my head in a spin !  Like all these things, if you watch someone do it, it may not be such a problem as first appears but I just want to get up and running. 

[AshimotoK0]

Thanks for info Dave.  I have used M & P before so I do trust them and as you've tried and tested their coils that's another option open.  May well do that after reading 11 pages Ash's coil rebuild it left my head in a spin !  Like all these things, if you watch someone do it, it may not be such a problem as first appears but I just want to get up and running. 

It's not as daunting as you think Les but given your missus is in hospital, not the time for messing around I agree. I only did that detailed write-up because people on here requested it. To cut corners on the detail would lead to a million and one questions. The thing is for much less than a tenner you can give Honda coils a new lease of life. The replacements from DS are 230 GBP and and you can bet your life a great deal of the original ones are living on borrowed time due to the HT lead plastic going rock hard and fatiguing the inner conductor.

One thing I do plan to do is make a couple of little electronicboxes  which will power the coils at running frequency, off the bike. I will give them away on here and they can be passed around between members.

[LesH]

When you say "DS" I'm assuming that's the "DS" in Suffolk ?  I've checked on their site and the price quoted is £34:80 each inc VAT ( £230 as stated by Ash) but I've read a previous forum here saying that they don't perform at the 4/5 Ohm threshold.  Hummm !   

[gtmdriver]

I bought a pair of the DS coils for my CB350F and, fortunately, I checked them out before fitting.

They were only 2 ohm primary resistance.

I ended up having to fit a pair of ballast resistors in the power feed to the coils in order to use them on my Boyer system.



To be honest I wouldn't even use 2 ohm coils in a 12v contact breaker system. The extra current will cause the points to arc and burn much quicker than they should.

[hairygit]

I think Ash was referring to the prices of genuine coils at D.S. not the pattern ones!

[LesH]

That must have been in the "olden days" then because he only lists aftermarket parts now.

[AshimotoK0]

That must have been in the "olden days" then because he only lists aftermarket parts now.

Yes David Silver Spares in Suffolk. OK so that was for the 750 which used the same Nippon Denso FL703 coil as the 500 and 400/350 fours. The only difference is the lead length but you could shorten the 750 ones to suit . The 500 assy is 30500-323-023 which is obsolete and is likely to be even more than the 750 if you can find one, even CMSNL don't have any. The alloy frame is the same on the 500 as the 750.

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[LesH]

That is a scary amount !!  I shall do some of the suggested checks over the weekend and failing that buy some of the M & P ones.  Thank you for your guidance and replies one and all.

[Johnwebley]

try Wemoto,

  they offer a couple of pattern ones


  http://www.wemoto.com/bikes/honda/cb_500_four_k2/73/picture/ignition_coil_-_alternative/