\'88 GSX-R750 - Pinging story 
Hey ya'all,
I'm new to this forum, but i've known of it for quite some time, a problem has
developed with my '88 GSX-R 750 after getting the bike back from a major
service a week and a half ago.. I didn't know who
else to turn to for immediate advice / assistance on what to do.. I would
really appreciate your help here.
Basically the situation is this:-
Took the bike in for a major service as recently it started idling very high
(around 2,500rpm) when it would warm up... it was overdue for a service
anyway.. they held onto the bike for a few days and reported back to me that
one of the main needles in each of the carbs was worn half way through,
which was causing the idling problem in the heat.. (apparently it's a common
problem with this particular model) so they replaced those, and tuned the
bike up for me.. saying that it was actually in excellent nick mechanically
for it's age, considering these particular bikes have more then likely been
through a very rough life.. I pick the bike up ... take it for a ride in the
immense heat the following day.. voila, idling problem gone! .. was happy
about that, the following day I take it out again.. within 5 mins... as i
pull up at the first set of lights, the bike sounded like it was running on
3 cylinders.. it would 'try' to run on 4 as i take off again but was running
very rough.. so i ring the guys up, take it back last thursday and leave it
with them... he gives it back to me today (free of extra charge) stating
that there was something else wrong with the carbs (to do with the slides?)
causing it to run extremely rich... problem solved he said, so i take it
away this afternoon ... noticed within 10 mins that it was still idling
quite rough, but when revving it, it sounded fine...... after another 10
mins or so riding around, it started pinging severely... it used to do it
when taking off under lag (ie. second gear) .. but only a little bit, now
it's doing it EVERY time i take off in first gear,.. with next to no load...
i'm not sure what causes pinging to occur or whether or not it causes
permanent damage ... but the point is, before i gave the bike to the
mechanic.. none of these rough idling (3 cylinders?) or horrible pinging was
occuring..
I'm wondering if it's the fuel changeover thats caused it... the bike's been
running on synergy 8000 (premium unleaded) for as long as i've had it, as well as the
previous owner... so at least 4 years... it seemed to love the stuff, but i
was told the first time i brought the bike to the mechanic, NOT to run
premium .. but just standard unleaded, as premium is causing it to run too
rich... so when I got it back, i filled up the tank with the first lot of
standard unleaded it's ever had (as far as i know) .... perhaps the bike
hates the stuff because it's been running on premium for so many years?
Sorry for not making this as short and simple as it probably could have been
said,... I just wanted to make sure the situation was clear to everyone..
I phoned the bike shop just before and told them about the immense pinging
and they said it sounds like the unleaded i've put in it, but ferFUXsake, it
was one of the mechanics there that advised i do so.... they have now
suggested that i take it easy on the bike and use up the 10 bux worth of
fuel currently in it.. once on reserve... go and fill it back up with the
premium and see if all symptoms of eratic idling / pinging dissapear, if
not, they said to bring it back to them and they'll look at the coils (?)
sometimes they can just decide to die in the arse apparently... i fail to
see how that could be a direct cause of the pinging though....
what do you guys suggest I do? and are the guys at the bike shop
correct in saying it's the changeover in fuel?
I'm really concerned the bike will never be the way it was before i gave it
to the shop (apart from the original high idling problem in the heat)
Cheers,
Urasia
[ 01-28-2003, 01:56 AM: Message edited by: Urasia ]
Hey ya'all,
I'm new to this forum, but i've known of it for quite some time, a problem has
developed with my '88 GSX-R 750 after getting the bike back from a major
service a week and a half ago.. I didn't know who
else to turn to for immediate advice / assistance on what to do.. I would
really appreciate your help here.
Basically the situation is this:-
Took the bike in for a major service as recently it started idling very high
(around 2,500rpm) when it would warm up... it was overdue for a service
anyway.. they held onto the bike for a few days and reported back to me that
one of the main needles in each of the carbs was worn half way through,
which was causing the idling problem in the heat.. (apparently it's a common
problem with this particular model) so they replaced those, and tuned the
bike up for me.. saying that it was actually in excellent nick mechanically
for it's age, considering these particular bikes have more then likely been
through a very rough life.. I pick the bike up ... take it for a ride in the
immense heat the following day.. voila, idling problem gone! .. was happy
about that, the following day I take it out again.. within 5 mins... as i
pull up at the first set of lights, the bike sounded like it was running on
3 cylinders.. it would 'try' to run on 4 as i take off again but was running
very rough.. so i ring the guys up, take it back last thursday and leave it
with them... he gives it back to me today (free of extra charge) stating
that there was something else wrong with the carbs (to do with the slides?)
causing it to run extremely rich... problem solved he said, so i take it
away this afternoon ... noticed within 10 mins that it was still idling
quite rough, but when revving it, it sounded fine...... after another 10
mins or so riding around, it started pinging severely... it used to do it
when taking off under lag (ie. second gear) .. but only a little bit, now
it's doing it EVERY time i take off in first gear,.. with next to no load...
i'm not sure what causes pinging to occur or whether or not it causes
permanent damage ... but the point is, before i gave the bike to the
mechanic.. none of these rough idling (3 cylinders?) or horrible pinging was
occuring..
I'm wondering if it's the fuel changeover thats caused it... the bike's been
running on synergy 8000 (premium unleaded) for as long as i've had it, as well as the
previous owner... so at least 4 years... it seemed to love the stuff, but i
was told the first time i brought the bike to the mechanic, NOT to run
premium .. but just standard unleaded, as premium is causing it to run too
rich... so when I got it back, i filled up the tank with the first lot of
standard unleaded it's ever had (as far as i know) .... perhaps the bike
hates the stuff because it's been running on premium for so many years?
Sorry for not making this as short and simple as it probably could have been
said,... I just wanted to make sure the situation was clear to everyone..
I phoned the bike shop just before and told them about the immense pinging
and they said it sounds like the unleaded i've put in it, but ferFUXsake, it
was one of the mechanics there that advised i do so.... they have now
suggested that i take it easy on the bike and use up the 10 bux worth of
fuel currently in it.. once on reserve... go and fill it back up with the
premium and see if all symptoms of eratic idling / pinging dissapear, if
not, they said to bring it back to them and they'll look at the coils (?)
sometimes they can just decide to die in the arse apparently... i fail to
see how that could be a direct cause of the pinging though....
what do you guys suggest I do? and are the guys at the bike shop
correct in saying it's the changeover in fuel?
I'm really concerned the bike will never be the way it was before i gave it
to the shop (apart from the original high idling problem in the heat)
Cheers,
Urasia
[ 01-28-2003, 01:56 AM: Message edited by: Urasia ]
