Bike won't run - GSXR750 K7

[f2dz]

Quick update – got the bike running last night and idling how it had been previously. I always thought it idled a bit rough/low ever since I bought it a few weeks ago so I'm gonna get it looked at by George at MD I think.

It has a K&N filter on it and the exhaust looks stock but doesn't sound stock, so I'm just wondering if the air/fuel mixture could be off because of this, or should the ECM be able to compensate for that?

That's not good news mate. Hope you sort it out soon. At least you've got your little 250 to get around on......

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Was glad to have it, but at the same time reminded me that there's no turning back to a lil 250 again now!

K6/7s have a fuel prefilter inside the pump which can clog. The actual filter is in the pump body. Idling issues can be a tps (throttle position sensor)issue which involves putting the bike in dealer mode. Battery cond is often an issue with idle so check voltage using a load tester. Finally, this model has a reputation for reg/rec issues which affect charging and therefore idle/throttle response.The appropriate sub forum on gixxer.com may help once you filter the USA bullshit out. Hopefully it is just a bunch of bad gas/moisture in a connector!

Thanks for this, all really good information. I'll keep this in mind if it happens again. Cheers!

[SVboy]

I think the ECU can cope ok with a filter and slipon/modified exhaust but probably wont be running optimally. Best way forward is a PCV and custom dyno map but that involves a few $$. Great benefits however, and good to know your bike is not leaning out because of the mods. The std k6/7 muffler is loud standard-sounds very good in fact imho![but weighs a tonne!]

[Drew]

Take it to a dealer with a dyno, and get the standard ECU tuned. No need to fuck around with a power commander when you have a gixxer.

[BuzzardNZ]

Take it to a dealer with a dyno, and get the standard ECU tuned. No need to fuck around with a power commander when you have a gixxer.

+1

I had this done to my SV ( TEKA tune ) and it sorted out all the rough running / flats spots that the bike had after I added after market pipes and air filter + desnorkel.

Well worth it. Only downside is that while I got a smoother running bike with more power, the fuel economy got noticeably worse ( as if I give a toss about that! )

[f2dz]

Take it to a dealer with a dyno, and get the standard ECU tuned. No need to fuck around with a power commander when you have a gixxer.

Hoping George can do all that for me. Pain in the arse for me to get to Colemans during the week or weekend. I don't live nearby at all.

+1

I had this done to my SV ( TEKA tune ) and it sorted out all the rough running / flats spots that the bike had after I added after market pipes and air filter + desnorkel.

Well worth it. Only downside is that while I got a smoother running bike with more power, the fuel economy got noticeably worse ( as if I give a toss about that! )

My fuel economy is pretty horrible as it is! Something I really didn't think about when considering a supersport and makes me look like an idiot when I complain about it, but meh. I'll take power over economy any day.

[BuzzardNZ]

I'll take power over economy any day.

Same here. But would be nice to own a 100+ HP bike with a gn250 like thirst!

[SVboy]

Get your mechanic to put a new set of plugs in at same time. And put a -1 tooth front sprocket on-cheap performance upgrade. Your speedo will over read[ fix with speedo healer/speedo DRD] . Thank me later! [will NOT improve fuel consumption!]

[f2dz]

Same here. But would be nice to own a 100+ HP bike with a gn250 like thirst!

I'd love that too. I died a little inside once I realised how much more the GSXR was costing me in gas over my old VTR250, especially as I use it to commute 60km a day.

Get your mechanic to put a new set of plugs in at same time. And put a -1 tooth front sprocket on-cheap performance upgrade. Your speedo will over read[ fix with speedo healer/speedo DRD] . Thank me later! [will NOT improve fuel consumption!]

Will do the plugs for sure but might leave the sprocket for now until I get a bit more familiar with the bike. Cheers for the tip!

[R650R]

GSXRs can get fine fuel mileage if you can restrain yourself. My 98 GSXR750WW averages 5.5L per 100km easy staying below 120 on main roads and passing with restraint. At a puke' track day though I've had it hit reserve in 140 km from a full tank.
My model (and urs to prob) has a richer fuel map above 120k and when accel in 5 & 6.
I've had elec probs with mine (they will still run fine on dead batt just start hassles).
I'd say sounds more like water in loom/connectors after rain.
The early models had problem with plastic fuel pipe on pump inside tank breaking too.
No recall just is ones that break...

I wouldn't put that gull ethanol rubbish anywhere near my motors either.
If it was fuel contamination it would effect whole rev range too.

[bsasuper]

Get rid of the K&N filter, sure they flow a bit more than stock, that's because they don't filter very well.

[f2dz]

GSXRs can get fine fuel mileage if you can restrain yourself. My 98 GSXR750WW averages 5.5L per 100km easy staying below 120 on main roads and passing with restraint. At a puke' track day though I've had it hit reserve in 140 km from a full tank.
My model (and urs to prob) has a richer fuel map above 120k and when accel in 5 & 6.
I've had elec probs with mine (they will still run fine on dead batt just start hassles).
I'd say sounds more like water in loom/connectors after rain.
The early models had problem with plastic fuel pipe on pump inside tank breaking too.
No recall just is ones that break...

I wouldn't put that gull ethanol rubbish anywhere near my motors either.
If it was fuel contamination it would effect whole rev range too.

Good to know. Yea I've gradually been able to restrain myself lately after having owned the bike for a few weeks now. Wasn't too keen on using Gull fuel myself either, so have ruled that out for now as the bike seems to be running okay again. George from MD is coming to service it next Wednesday.

Get rid of the K&N filter, sure they flow a bit more than stock, that's because they don't filter very well.

First person that I've heard this from so I'll ask my mechanic what his opinion is. Logic makes sense though.

[Akzle]

Get rid of the K&N filter, sure they flow a bit more than stock, that's because they don't filter very well.

keep them cleaned and oiled apropriately (read: time and effort and pita) and they filter just as well as paper, with m0ar flow.

[Akzle]

and bro dont chu know it givz yous ten more horse powers au. Tru as, i saw it on need for speed

[R650R]

keep them cleaned and oiled apropriately (read: time and effort and pita) and they filter just as well as paper, with m0ar flow.

Yep that's right. I've got one in the car (just because its in a PITA spot to access/service) and my oil is clean as even with longish service intervals. Must make time to clean it and re oil, done 60,000km on it.

[bsasuper]

I have seen many engines with damage due to dirt /crap etc not being filtered out, all had K&N filters, one of the engines was my own.If I have to use an aftermarket filter I use another brand that starts with the letter B. But everyone to their own so use a K&N if you feel it will do the business.