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 Post subject: Required for Serow 4JG model - Ignition CDI Unit.
PostPosted: Sun Jun 26, 2016 12:52 pm 
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650 cc Monster
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Joined: Fri Dec 07, 2012 2:22 pm
Posts: 2439
Location: Romiley
Greetings,

I am looking for a replacement cdi ignition unit, either to borrow for testing :roll: or to buy.

My bike started with an intermittent loss of power, not really misfiring, after running constantly at about 50 mph then going up a hill, change down a gear and although not happy it would keep going, close the throttle for a little while and then the problem would seam to clear. Eventually this condition has got worse and despite all bench testing I have not found the cause. The bike starts and idles just fine, pulls away and runs at low speeds fine, but eventually up the rev range it starts to stutter and then loose power. The fuel system has been totally stripped and cleaned with nothing found, inlet manifold replaced as the original was age cracking, so I must conclude that the fault is electrical.

I suspect that the fault is most likely with the CDI unit, (it could even be the coil), unless you might have experienced the same problem and know of a different answer.

TTFN

Hugh.

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Please note that I am not a National TRF Officer, any views expressed are my own and may not be in accordance with any official policy.


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 Post subject: Re: Required for Serow 4JG model - Ignition CDI Unit.
PostPosted: Sun Jun 26, 2016 4:14 pm 
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650 cc Monster

Joined: Sun Nov 11, 2012 7:31 pm
Posts: 3512
Hugh,it may be the HT lead breaking down, I had this on a bike once...even though most coils and leads are 'captive' it is possible to grind the body of the coil where the lead enters, and replace the lead with a new one (soldered on)....then fill back up with sealer.Worth a try as its a 'free' fix.


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 Post subject: Re: Required for Serow 4JG model - Ignition CDI Unit.
PostPosted: Mon Aug 08, 2016 8:15 pm 
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650 cc Monster
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Joined: Fri Dec 07, 2012 2:22 pm
Posts: 2439
Location: Romiley
Greetings folks,

Well what a nightmare that has been but finally I have rectified the severe misfire/hesitation.

Repeatedly cleaned the carburettor, tank tap and filter; new inlet manifold stub; tested wiring harness; cleaned and tested switch gear; new high output winding fitted to the generator; substituted cdi; new Yamaha ignition coil fitted after bench testing the old one; new spark plug cap; spark plug changed but still could not pull higher revs nor road speed above 40 mph.

Sit down, think it through, so today I dismantled the silencer to find it partially blocked with disintegrated absorption blanket and mesh; cleaned it all out; fitted new steel scouring pads without any blanket and guess what - noisier :evil: but pulls like a train again - result ;)

Carburation looks a bit rich by residue on the spark plug so still some fine adjustments to be made but I can put up with that. Bring it on :lol: :lol:

TTFN

Hugh.

_________________
Please note that I am not a National TRF Officer, any views expressed are my own and may not be in accordance with any official policy.


Last edited by Hugh Cleary on Mon Aug 08, 2016 8:28 pm, edited 1 time in total.

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 Post subject: Re: Required for Serow 4JG model - Ignition CDI Unit.
PostPosted: Mon Aug 08, 2016 8:25 pm 
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80 cc

Joined: Sat Nov 15, 2014 9:36 pm
Posts: 88
All that head scratching, you must be 'exhausted' ...............
..............................................................

I'll get my coat :roll:


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 Post subject: Re: Required for Serow 4JG model - Ignition CDI Unit.
PostPosted: Wed Aug 10, 2016 12:18 am 
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650 cc Monster

Joined: Sun Nov 11, 2012 7:31 pm
Posts: 3512
Doh ! Sometimes loud exhausts with big straight throughs ARE better !Glad to hear your TAIL, now has a happy ENDING....


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 Post subject: Re: Required for Serow 4JG model - Ignition CDI Unit.
PostPosted: Wed Aug 10, 2016 4:58 pm 
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125cc

Joined: Mon Feb 22, 2016 6:19 pm
Posts: 145
Hi Hugh ,glad your sorted ,I thought this one had you baffled :lol:


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 Post subject: Re: Required for Serow 4JG model - Ignition CDI Unit.
PostPosted: Wed Aug 10, 2016 6:14 pm 
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650 cc Monster

Joined: Sun Nov 11, 2012 7:31 pm
Posts: 3512
So what you are saying Hugh is your 'silencer is golden'.... Ahem...


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 Post subject: Re: Required for Serow 4JG model - Ignition CDI Unit.
PostPosted: Fri Aug 19, 2016 12:39 pm 
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650 cc Monster
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Joined: Fri Dec 07, 2012 2:22 pm
Posts: 2439
Location: Romiley
Greetings,

The battery suddenly lost charge, recharged, lost charge again :roll: Strange all tested out fine, upon closer inspection however I found that the charger connector socket wiring had fractured just where the leads enter the top and was hidden under the securing cable tie :evil: :evil: :evil: :evil:

New cable fitted and moved the position of the new cable tie, result :D :D :D

Attachment:
charger.jpg
charger.jpg [ 161.93 KiB | Viewed 8120 times ]


TTFN

Hugh.

_________________
Please note that I am not a National TRF Officer, any views expressed are my own and may not be in accordance with any official policy.


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