Posted by Chris N Deuchar on May 23, 2006, 7:44 am
Being an electronicky person I have no qualms whatsoever about delving
into the tinny depths of the Unit of my 1981 Yamaha XV750SE, however,
to save me working out the circuit diag, has anybody done this already
- or know where I can find a copy?
The problem is that, once running, the beast goes fine, but on
starting (and overrun), it appears "over advanced". Elsewhere I have
heard that something in the CDI retards things under these conditions
so I would like to find out which 'bit' this is and sort it. Its
really struggling to turn over against the first firing - despite new
Yuasa batt.
A thorough electrical (and valve clearance) check has revealed no
other issues. I never had this problem when I first got the bike - any
help gratefully received.
Cheers
Chris D
--
The Deuchars. BBB#40 COFF#14
Suzuki GS550t, Yamaha XV750SE
http://www.Deuchars.org.uk
Tel(work):0115 951 6264
Posted by TOG@Toil, chateau.murray@btint on May 23, 2006, 8:25 am
Chris N Deuchar wrote:
> Being an electronicky person I have no qualms whatsoever about delving
> into the tinny depths of the Unit of my 1981 Yamaha XV750SE, however,
> to save me working out the circuit diag, has anybody done this already
> - or know where I can find a copy?
> The problem is that, once running, the beast goes fine, but on
> starting (and overrun), it appears "over advanced". Elsewhere I have
> heard that something in the CDI retards things under these conditions
> so I would like to find out which 'bit' this is and sort it. Its
> really struggling to turn over against the first firing - despite new
> Yuasa batt.
> A thorough electrical (and valve clearance) check has revealed no
> other issues. I never had this problem when I first got the bike - any
> help gratefully received.
In my experience, CDI units either work or they don't - there's no
halfway house. And as the XV750 is notorious for its self-destructing
starter motor clutch, I'd suggest the problem lies here. I'd also check
things like air intakes, carb diaphragms etc to sort out the over-run
thing. Either way, I bet it's not the CDI.
Posted by e on May 23, 2006, 10:09 am
>Chris N Deuchar wrote:
>> Being an electronicky person I have no qualms whatsoever about delving
>> into the tinny depths of the Unit of my 1981 Yamaha XV750SE, however,
>> to save me working out the circuit diag, has anybody done this already
>> - or know where I can find a copy?
>>
>> The problem is that, once running, the beast goes fine, but on
>> starting (and overrun), it appears "over advanced". Elsewhere I have
>> heard that something in the CDI retards things under these conditions
>> so I would like to find out which 'bit' this is and sort it. Its
>> really struggling to turn over against the first firing - despite new
>> Yuasa batt.
>>
>> A thorough electrical (and valve clearance) check has revealed no
>> other issues. I never had this problem when I first got the bike - any
>> help gratefully received.
>>
>In my experience, CDI units either work or they don't - there's no
>halfway house. And as the XV750 is notorious for its self-destructing
>starter motor clutch, I'd suggest the problem lies here. I'd also check
>things like air intakes, carb diaphragms etc to sort out the over-run
>thing. Either way, I bet it's not the CDI.
there are fixes for the starter. check the yahoo groups.
Posted by The Older Gentleman on May 23, 2006, 2:37 pm
sort out the over-run
> >thing. Either way, I bet it's not the CDI.
> >
> there are fixes for the starter. check the yahoo groups.
There are indeed.
--
Trophy 1200 750SS CB400F CD250 Morini 500 Sport
GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3
BOF#30 WUSS#5 The bells, the bells.....
Posted by Chris N Deuchar on May 24, 2006, 7:49 am
someone@some.domain says...
> there are fixes for the starter. check the yahoo groups.
Ta, will do
Chris D
--
The Deuchars. BBB#40 COFF#14
Suzuki GS550t, Yamaha XV750SE
http://www.Deuchars.org.uk
Tel(work):0115 951 6264
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> into the tinny depths of the Unit of my 1981 Yamaha XV750SE, however,
> to save me working out the circuit diag, has anybody done this already
> - or know where I can find a copy?
> The problem is that, once running, the beast goes fine, but on
> starting (and overrun), it appears "over advanced". Elsewhere I have
> heard that something in the CDI retards things under these conditions
> so I would like to find out which 'bit' this is and sort it. Its
> really struggling to turn over against the first firing - despite new
> Yuasa batt.
> A thorough electrical (and valve clearance) check has revealed no
> other issues. I never had this problem when I first got the bike - any
> help gratefully received.