GSXR600 SRAD to 750cc

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

A mate of mines got a Gixxer 6. SRAD. Bit of an old girl, Overall quite a good bike. But its high mileage and the engines a bit run down.
After a long run, It starts to cut out, And die, As if its flooding out.

Theres an un-nerving rattle coming from the engine. The clutch is shocking. First gear doesn't select 90% of the time. It needs to be really stamped into gear.

To cut a long story short, It would be cheaper / easier to either replace the bike. Or the engine as a whole.

I suggested sticking a 750 engine from a bike of similar year. Is this as easy as I think it is? A straight swap in terms of engine mounts etc?

And how much better is the 750 motor over the 600. I've had a go on this 600 of my mates and its a tired old girl. it wont even clutch wheelie its that underpowered.

Ben

Phoenix · Twisted Firestarter Joined: 01 Aug 2002 Karma :

Frames are identical so it'd be a straight swap, you just need the engine, carbs and CDI, swapping to a fuel injection 750 engine is more hassle as you'd need the injection specific tank, and clocks are different (FI light etc) though you could no doubt still used carbed versions.

geordiecbrblo... · Trackday Trickster Joined: 17 Jul 2005 Karma :

Hmmm what about investigating the faults? The fuelling / cutting out won't be fixed with a new engine cos you don't normally get the ancilleries with the engine. The rattle? CCT? 1st gear, strip, clean, re-lube linkages? Might not cost much at all...

If you do go for the engine swap, I'd recommend staying with the 600 - at least the bike can be sold as standard then, rather than spending a lot of cash to devalue / limit the bikes resale.

Just my 2p Smile

Keir · World Chat Champion Joined: 11 Apr 2006 Karma :

Coxyzxr · Brolly Dolly Joined: 22 May 2008 Karma :

Are you sure the engine's on it's last legs? A light rattle from the piston end can still keep going for a good while.

A definite 'knocking' or machine gun kind of sound then likely big end and it's a pretty iminent failure.

Thing is... most jap engines are bullet proof and will last (Suzuki certainly no exception) but everything else (as your friend has probably realised) fails around it.

Are you sure the rattle IS from the engine?

Like others have said an engine swap won't be a fix all.
I'm inclined to think the doggy performance is down to the other components, clutch, worn chain, carbs likely out of whack, plugs old. All little things that WILL add up to a big performance hit.

A friend had a 93/94 gsxr 750 that was ragged to hell.
He refreshed all the consumables and had a sevice done on the carbs and dyno'd it. As stock with an aftermarket yoshi can on it was still kicking out around the same HP as it was supposed to from new.
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**WAS FITTED "WRONG WAY ROUND" !** CANT ACCOUNT FOR THE STUPID !

sickpup · Old Timer Joined: 21 Apr 2004 Karma :

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Is it definitely the clutch though, With the gear issue?
It selects all other gears fine. Even from Neutral, To 2nd. It will glide in.
It just wont go from 2nd to 1st without a fight.

How difficult of a job is a cam chain change?

Mileage is around 25k miles, And it was only serviced around 2k miles ago.

Ben

Coxyzxr · Brolly Dolly Joined: 22 May 2008 Karma :

MaybeGuy · Super Spammer Joined: 12 Mar 2007 Karma :

seconded. mines on just under 35k and going perfect.

i had a fuelling problem like the one described, but a new fuel pump sorted it.

rattle is likely a CCT problem. £40 for the part from APE for a manual one which is less likely to fail.

the gearbox problem sounds clutch related almost, as when i dont fully disengage the clutch mine doesnt like going into first, but then again, i do prefer the biting point close to the bars.

try keeping downward pressure on the lever and letting the clutch out slightly.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green

Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

I personally think its got more than 25k on it. I cant be sure they are the original clocks.

I've not had a good look at it really. I just know it goes powerless when its had a good run. And it does have a definite engine rattle.
It only really rattles when you blip the throttle, and the revs are dropping back to idle.

Its certainly not something jingling about behind the fairings etc. Its 100% an internal engine noise.

Ben

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Come to think of it, It could be the clutch rattling couldnt it? Which could possibly explain the dodgey gear?

Ben

MaybeGuy · Super Spammer Joined: 12 Mar 2007 Karma :

sounds like the CCT is rattling as the cam chain changes tension. i personally dont think its the clutch,
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green

Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

sickpup · Old Timer Joined: 21 Apr 2004 Karma :

Why not take the clutch lever off and see if the bolt hole is still round?

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

I'll have a look tomorrow. Leon is popping up to my work to collect a paddock stand.

Could an elongated bolt hole really make that much of a difference?

Ben

sickpup · Old Timer Joined: 21 Apr 2004 Karma :

That much that it's almost impossible to change gear.

sickpup · Old Timer Joined: 21 Apr 2004 Karma :

acks · L Plate Warrior Joined: 30 Jan 2008 Karma :

Normal for the SRAD to battle getting into first.....Its nothing abnormal for this bike. I sometimes stop on mine in 4th, and battles to go all the way down to 1st.

Just an SRAD Issue, clutch, I had the same problem, and the rattle, i got it too, have no clue what it is, but only at high revs. The other chain rattle is your cam chain and tensioner, replace them.

Id stick to the 600 SRAD, im not imressed with the 750 SRAD, there really isnt much difference, and the 600 pulls off faster, I think its because its carbed.

Thats my 2 south african cents worth Wink

trust me thats not much over your side!