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seeyalater
Trackday Trickster



Joined: 15 Sep 2019
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PostPosted: 19:36 - 04 Dec 2019    Post subject: Is the rev range ok Suzuki gsf650 - Reply with quote
Hi, this is probably daft, but il ask anyway.
I have a gsf650 on a 2007 reg. its my 1st bike and i trained on a brand new speed triple 765 which seemed really quiet.

ive noticed on the suzuki at 50mph in 6th gear im at 4000rpm. it has a different exhaust (beowolf) which is louder than standard can. it seems to want another gear, something i didnt notice on the quiet triumph.

is it the exhuast or just me not being used to a differnet bike. sorry if dumb
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Easy-X
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Joined: 08 Mar 2019
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PostPosted: 21:17 - 04 Dec 2019    Post subject: Reply with quote
50mph, 6th gear?! Barely cruising.

What's it redline at, 12k? Surely there's loads left in it?
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Kentol750
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Joined: 24 May 2016
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PostPosted: 21:31 - 04 Dec 2019    Post subject: Reply with quote
Yeah. 4 cylinder different. Revs depend on if bike set up to exhaust. Not all are plug and play.
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Alex A
World Chat Champion



Joined: 05 Mar 2007
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PostPosted: 22:21 - 04 Dec 2019    Post subject: Reply with quote
Kentol750 wrote:
Yeah. 4 cylinder different. Revs depend on if bike set up to exhaust. Not all are plug and play.


Utter rubbish.

The ratio of engine RPM to wheel speed (and therefore vehicle speed) is entirely a product of gearing and wheel circumference (including tyre diameter/pressure/wear).

You could fit any exhaust to your bike (or no exhaust). If that's all you change, it'll still do 4000rpm at 50mph.

If the redline is 12k, that's a theoretical top speed (by gearing) of 150mph. That seems about right for a faired 650cc Bandit.

OP: As you've suggested, it's probably more a perception issue due to the noise of a straight through exhaust. Get used to it or fit a bigger silencer.
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seeyalater
Trackday Trickster



Joined: 15 Sep 2019
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PostPosted: 08:14 - 05 Dec 2019    Post subject: Reply with quote
Hi, yes redline is 12000 so more a noise issue. do wonder if carbs were set up to the exhaust though, seperate issue i guess but its a thought., rides nice but will test later with new plugs, looks like originals been there 26000 miles. revs crisper with choke on than off, i could try get a video and see what you experienced guys/girls think.

my gut feeling is this guy put a aftermarket can on and did nothing else to match it all up. next thing is either pay to have done or have a go and get to know the bike.
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seeyalater
Trackday Trickster



Joined: 15 Sep 2019
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PostPosted: 14:32 - 05 Dec 2019    Post subject: Reply with quote
mpd72 wrote:
Leearchertog wrote:
Hi, yes redline is 12000 so more a noise issue. do wonder if carbs were set up to the exhaust though, seperate issue i guess but its a thought., rides nice but will test later with new plugs, looks like originals been there 26000 miles. revs crisper with choke on than off, i could try get a video and see what you experienced guys/girls think.

my gut feeling is this guy put a aftermarket can on and did nothing else to match it all up. next thing is either pay to have done or have a go and get to know the bike.


Isn't a 2007 GSF650 fuel injected?

It's just a louder can with standard gearing. It may seem odd if you're used to cars, but cars don't redline at 12,000rpm.
Cruising at 1/3 revs at 50mph is perfectly normal.

No amount of changing fuelling will lower the revs.


Hi, its got 2 carbs, not sure if there is a fuel injection model. I can see its the can and i should just ride and enjoy lol. driving a car for years that cruises at 2000rpm at 70mph just threw me off

New plugs have made it crisper and i rang the can manufacturer and that bike should be fine with no tuning unless someone has upgraded the air filter. which i need to check.

thanks for input everyone.
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Teflon-Mike
tl;dr



Joined: 01 Jun 2010
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PostPosted: 15:49 - 05 Dec 2019    Post subject: Reply with quote
Leearchertog wrote:
driving a car for years that cruises at 2000rpm at 70mph just threw me off.
Very common. A car is a box, full of sound deadening. Engine is in another box full of sound deadening. And they tend not to rev very high.
Bikes? There's no box, and you're sat over the top of an engine that likely revs to 2x or more the rpm's.
Consequently, the tendency is to 'short-shift' up the gearbox and try doing all your speed control on the gears not the throttle.
Perversely, this is NOT as oft presumed good for the engine or the environment. It takes X power yo go Y mph, end of. Power is load times revs, so if you are doing 50mph, it matters little whether you achieve that necessary X power from a tall gear, few revs and a lot of throttle, or the other ways about, a low gear, lots of revs and not a lot of throttle... its the same 'power', and the same fuel consumption and emissions to make it.. There is he question of efficiency... b-u-t, the infernal combustion engine is horrendously inefficient to start with, to all extents and purposes you are talking rain-drops-in-an-ocean. Generally efficiency falls with revs, but wear increases, and you are in a world of swings and round-a-bouts, looking for an optimum; to wit, usually the most optimal and hence usually most 'efficient' revs for an engine co-incide with where peak torque is made, and on a more highly tuned motorbike engine (Compared to a car, or a lorry, or a cement mixer!), that peak torque revs tends to be higher up the rev-range and closer to peak power, if not almost co-incident with it as some sports bikes, than it is down near tick-over rpm.

BUT the long and the short of it is USE THE REVS NOT THE GEARS, learn to modulate speed on the throttle and ride for response and SOD the noise... if its to loud, get a more silencing silencer!

I tend only to use 1st at launch, then almost every-where else, once the bike's moving' I can 'do' in 2nd or 3rd; especially around town, where I want, nay NEED, the response of the lower gears to deal with SMIDSYing twits! I only ever get above 3rd really, on open A-Roads where I can SEE for a long way, like 1/4 mile or more, that I wont have to change speed or very much for a while, and I dont need the throttle response or flexibility, and can appreciate the more 'relaxed' cruising of lower revs.

Ie learn to use the throttle properly, and don't be so sensitive to what will always be a much more frenetic 'engine-noise' cos you is so close to it, with do little noise deadening.

A-N-D if you are still bothered by the exhaust noise... buy a quieter exhaust, or bike, or a car! This is a symptom, not a problem.

But yeah, if PO has fitted after-market can, you are pizzing in the wind as to whether that would make the mixture go weak, and valves burn out, or not... B-U-T that's a totally separate question to how 'busy' the engine may sound, what gears you try use, and when, or how loud the exhaust may be. You need separate the issues there.
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seeyalater
Trackday Trickster



Joined: 15 Sep 2019
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PostPosted: 16:47 - 05 Dec 2019    Post subject: Reply with quote
Teflon-Mike wrote:
Leearchertog wrote:
driving a car for years that cruises at 2000rpm at 70mph just threw me off.
Very common. A car is a box, full of sound deadening. Engine is in another box full of sound deadening. And they tend not to rev very high.
Bikes? There's no box, and you're sat over the top of an engine that likely revs to 2x or more the rpm's.
Consequently, the tendency is to 'short-shift' up the gearbox and try doing all your speed control on the gears not the throttle.
Perversely, this is NOT as oft presumed good for the engine or the environment. It takes X power yo go Y mph, end of. Power is load times revs, so if you are doing 50mph, it matters little whether you achieve that necessary X power from a tall gear, few revs and a lot of throttle, or the other ways about, a low gear, lots of revs and not a lot of throttle... its the same 'power', and the same fuel consumption and emissions to make it.. There is he question of efficiency... b-u-t, the infernal combustion engine is horrendously inefficient to start with, to all extents and purposes you are talking rain-drops-in-an-ocean. Generally efficiency falls with revs, but wear increases, and you are in a world of swings and round-a-bouts, looking for an optimum; to wit, usually the most optimal and hence usually most 'efficient' revs for an engine co-incide with where peak torque is made, and on a more highly tuned motorbike engine (Compared to a car, or a lorry, or a cement mixer!), that peak torque revs tends to be higher up the rev-range and closer to peak power, if not almost co-incident with it as some sports bikes, than it is down near tick-over rpm.

BUT the long and the short of it is USE THE REVS NOT THE GEARS, learn to modulate speed on the throttle and ride for response and SOD the noise... if its to loud, get a more silencing silencer!

I tend only to use 1st at launch, then almost every-where else, once the bike's moving' I can 'do' in 2nd or 3rd; especially around town, where I want, nay NEED, the response of the lower gears to deal with SMIDSYing twits! I only ever get above 3rd really, on open A-Roads where I can SEE for a long way, like 1/4 mile or more, that I wont have to change speed or very much for a while, and I dont need the throttle response or flexibility, and can appreciate the more 'relaxed' cruising of lower revs.

Ie learn to use the throttle properly, and don't be so sensitive to what will always be a much more frenetic 'engine-noise' cos you is so close to it, with do little noise deadening.

A-N-D if you are still bothered by the exhaust noise... buy a quieter exhaust, or bike, or a car! This is a symptom, not a problem.

But yeah, if PO has fitted after-market can, you are pizzing in the wind as to whether that would make the mixture go weak, and valves burn out, or not... B-U-T that's a totally separate question to how 'busy' the engine may sound, what gears you try use, and when, or how loud the exhaust may be. You need separate the issues there.


well thankyou for a very detailed and well written reply. totally agree with around town gears etc, even in training i stayed in 3rd/4th. i like the noise, just initially was worried if it was 'too high' for that speed. Which now seems a daft question but was worth the ask. If you dont ask you dont learn.
cheers.
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Confusion
Scooby Slapper



Joined: 02 May 2013
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PostPosted: 17:48 - 05 Dec 2019    Post subject: Reply with quote
Leearchertog wrote:

Hi, its got 2 carbs....


You need to count them again. Four carbs on the K5/K6 (05/06)
GSF650. These used the old air/oil cooled engine. Still one of
the best bike engines ever made.

Quote:
not sure if there is a fuel injection model.


K7 (07) and later models are fuel injected and
'water' cooled.

Quote:
I can see its the can and i should just ride and enjoy lol. driving a car for years that cruises at 2000rpm at 70mph just threw me off


As a car driving born-again biker, it also took me a while
to get used to 5000RPM+ on national routes and 6000RPM+
on motorways.

Quote:
New plugs have made it crisper


Mine came with a set of the cheaper CR9E plugs in it.
It might be my imagination, but it seems to run slightly better on
the recommended CR8EK plugs. These are the ones with the
dual earth electrodes.
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seeyalater
Trackday Trickster



Joined: 15 Sep 2019
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PostPosted: 18:06 - 05 Dec 2019    Post subject: Reply with quote
Confusion wrote:
Leearchertog wrote:

Hi, its got 2 carbs....


You need to count them again. Four carbs on the K5/K6 (05/06)
GSF650. These used the old air/oil cooled engine. Still one of
the best bike engines ever made.

Quote:
not sure if there is a fuel injection model.


K7 (07) and later models are fuel injected and
'water' cooled.

Quote:
I can see its the can and i should just ride and enjoy lol. driving a car for years that cruises at 2000rpm at 70mph just threw me off


As a car driving born-again biker, it also took me a while
to get used to 5000RPM+ on national routes and 6000RPM+
on motorways.

Quote:
New plugs have made it crisper


Mine came with a set of the cheaper CR9E plugs in it.
It might be my imagination, but it seems to run slightly better on
the recommended CR8EK plugs. These are the ones with the
dual earth electrodes.


Oh haha i just assumed 2 due to a paring thing i saw, but yes theres 4. mines 2007 but is defo carbed.
I just put the CR8IEK in, iradium or whatever it was, smoother today. think il just relax and stop worrying.
not done motorways yet, guessing that will do my head in, can now see why most wear ear plugs, did wonder. Although the guys i saw had quiet bikes.
cheers
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Easy-X
Super Spammer



Joined: 08 Mar 2019
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PostPosted: 18:55 - 05 Dec 2019    Post subject: Reply with quote
Funny, I always rag my old Skoda to get the turbo to kick in (>2000rpm) when actually the efficient thing to do is hover around 1500 and barely let the turbo see any action Sad

Needless to say no problems adjusting to higher revs after getting a bike Smile
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 18:58 - 05 Dec 2019    Post subject: Reply with quote
Is a Street Triple 765 OK for the DAS? I'd have thought it's far too powerful? Confused Confused

But yeah, hammer it to the redline, as long as you look after it and aren't bouncing off the limiter it's all gravy.

The chassis on the other hand...
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seeyalater
Trackday Trickster



Joined: 15 Sep 2019
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PostPosted: 19:35 - 05 Dec 2019    Post subject: Reply with quote
MarJay wrote:
Is a Street Triple 765 OK for the DAS? I'd have thought it's far too powerful? Confused Confused

But yeah, hammer it to the redline, as long as you look after it and aren't bouncing off the limiter it's all gravy.

The chassis on the other hand...


yeah was very good, on paper there 120bhp but i did wonder if restricted.
was EAW doncaster, the bikes are on fb page.

by the way to those who mentioned it, my 2007 is a K6 for some reason
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