Any bikers with advice?

[Cirrus]

I bought a Suzuki GSXR 600 SRAD on Sat. Nice example, 2000 model. Rode all the way from Bedford to mine (150 miles) without a hiccup. Monday I saw she was a little short on oil so topped her up but unwittingly over-filled her. Rode her for 8 miles and she started to ride very 'rough' below 5,000 revs. Brought her home and drained ALL oil out and did an oil and filter change. Thought while I was at it I would check the state of the air filter. Popped the tank up and hey presto - no filter but lots of gunk and dead flies. This bike has only covered 20 miles in 3 years so the first real blast it has had was the ride home. I popped a K&N performance filter in her and test rode her last night. Now she runs a tad better but is still very lumpy below 5K. In first she is dangerous because she coughs, splutters and then at 5K she pulls away.

Just wondered if anyone had any ideas (I know there are a few bikers on here) as spent a grand last week on my old bike before I part-Ex'd her so money is very tight with buying the new bike! I spoke to the dealer (small time doing it in his spare time) and he apologised saying he would never check if it had an air filter but now it seems like I have a fuelling issue with the 'juddering' below 5K.

 

[sprocketflup]

What year Srad is it? The early models were had carbs, in which case id be looking at the pilot jets for blockages. Im not sure about the SRad but a lot of carbed bikes had crankcase breathers which routed straight back to the airbox. Also check your plugs, I had one break down on my bike last month, was fine once you got it up the rev range a bit but spluttered in the low revs

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By the way, if you are now a Gixer owner, get yourself onto gixerjunkies.com for all the advise youll need, Ill see you there

 

[revjames]

Hmmm I would be concerned at the lack of air filter and the low oil. Lack of air filter could allow dust, sand whatever into the engine which would accellerate wear. The wear would manifest itself in lack of performance and high oil consumption. Sounds like it hasnt been looked after but hope you find a simple solution.

 

[steptoe]

Carbs or injectors? Sounds like a fuelling issue, may have been jetted or mapped to suit no filter, (badly), and now you have a k&N on the fuelling has gone to pot again. If its CV carbs its more likely a needle problem.

Why are the revs every that low? Give it the berries man!

ps. Could be a load of gunk in the carbs/injectors from sitting around. petrol evaporated leaving the water and additives behind which turns to glue!

 

[Cirrus]

It is the last of the carb models. Last serviced (according to service book) at 8K and is now on 14K. One owner from new and he put a Viper can on it. I reckon doing that he probably had running issues so found that by taking the air filter out he improved performance! Have bought a Haines manual today and some carb cleaner so will clean it all up, balance the carbs and hope that does it. Otherwise the bike will go into my bike mechanic and the dealer gets the bill.

 

[binky]

If its been stood for long periods of time, then the ride home probably stirred up all the crap in bottom of fuel tank, carbs etc etc. Strip it down, flush out all the crap, re-fill with nice fresh jungle juice (possibly with a bit of reddex thrown in). Check colur of plugs to see if carburation is correct, and then take for a long run on fast roads to blow cobwebs out. (get breakdown cover first )

Might also be worth putting a little Meths in fuel - apparently this helps clear water out of petrol tank.

 

[steptoe]

If its been stood for long periods of time, then the ride home probably stirred up all the crap in bottom of fuel tank, carbs etc etc. Strip it down, flush out all the crap, re-fill with nice fresh jungle juice (possibly with a bit of reddex evil stuffthrown in). Check colur of plugs to see if carburation is correct not so accurate on diesels as proper bikes. , and then take for a long run on fast roads to blow cobwebs out. (get breakdown cover first )Might also be worth putting a little Meths in fuel - apparently this helps clear water out of petrol tank isopropyl alcohol does a better job IMHO , but meths would be OK too.

agree with most of that, me in red,

strip the carbs and give them a good clean, steep in some cleaning solution, remember and take the CV vacumn rubbers out first!

the spray in stuff isnt really that good for really bunged up carbs TBH, but it might help if not too bad,

5k, sorry I thought it was higher, whats red line? 15? may well still be on the pilot(as someone else suggested), so could even be the emulsion tube clogged, does it make any difference if you have the choke on? slightly/half/full......

you could have a set of sliders that are too bunged to open smoothly and are jerking around the lift point, then suddenly jumping,

stick you finger down the bellmouth and push each one up and make sure it is nice and smooth and it should return smooth and gently too.

 

[sprocketflup]

agree with most of that, me in red, strip the carbs and give them a good clean, steep in some cleaning solution, remember and take the CV vacumn rubbers out first!

the spray in stuff isnt really that good for really bunged up carbs TBH, but it might help if not too bad,

5k, sorry I thought it was higher, whats red line? 15? may well still be on the pilot(as someone else suggested), so could even be the emulsion tube clogged, does it make any difference if you have the choke on? slightly/half/full......

you could have a set of sliders that are too bunged to open smoothly and are jerking around the lift point, then suddenly jumping,

stick you finger down the bellmouth and push each one up and make sure it is nice and smooth and it should return smooth and gently too.

Or a split CV rubber.

Careful what Steptoe tells you tho, hell have you checking the reeds and making sure the 2 stroke mix is correct

 

[sellers]

not upto speed on bikes, allthough I did have r1 carbs on my old golf.

Try this theory, overfilling oil, oil comes up through top breather pipe which may be connected to the airbox, chucking excess dirty oil through the carbs blocking the jets?

I'd try some carb cleaner on them.

 

[steptoe]

by jove old bean,

you may have something there.

(why dont we have a pipe smoking smilie? would that be un-PC?)

edit, Im not convinced carb cleaner will do the job properly, I have yet to use any that is actually 'good' , but I suppose that is relative to what you call good...

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not upto speed on bikes, allthough I did have r1 carbs on my old golf.Try this theory, overfilling oil, oil comes up through top breather pipe which may be connected to the airbox, chucking excess dirty oil through the carbs blocking the jets?

I'd try some carb cleaner on them.

the big problem with bike carbs on cars in the cornering, bikes lean in corners so the carbs stay constant, cars dont so then the carbs would either try and flood or starve,!

maybe you got it sorted,......

just a thought, we had the same issue on karts, had to use piston port carbs to be really effective.

 

[binky]

Diesel is good for cleaning purposes

 

[steptoe]

It is,

Its also good for destroying plastic and rubber components too,

Plus it leaves a nasty residue.

 

[NozSpark]

It is,Its also good for destroying plastic and rubber components too,

Plus it leaves a nasty residue.

Don't I frigging know it..

My kangoo has some stupid fuel line connectors that have a 'o' ring which seem to have perished and is now allowing air to enter.... Guess what, they don't sell the connectors! You have to buy a whole section of fuel line

 

[Sidewinder]

Noz,

What size 'o' rings mate, can't you just replace them?

 

[NozSpark]

Prob some weird French size knowing Renault... TBH I don't want to go stripping it down until I'm ready to replace them

It might not even have o rings,, it might be just a very good fit!

 

[steptoe]

Prob some weird French size knowing Renault... TBH I don't want to go stripping it down until I'm ready to replace themIt might not even have o rings,, it might be just a very good fit!

probably just a standard metric O ring, but will cost you a bomb as soon as you mention what it is for,

just buy a generic O ring, or even a box of them, about 7or8quid for a mixed box from most sellers.

 

[Cirrus]

Got her sorted in the end. New plugs needed as the over-fill of oil had gunked the old ones up. Runs like a dream now.

 

[Sidewinder]

Steps,

I carry 2 mixed boxes of std metric o rings on the van as well as boxes of plumbing standard seals!

 

[steptoe]

I needed an O ring for a pilot variable airjet once, 18 friggin' quid,!!!

then by pure accident I discovered that the O ring from a 520 O ring chain fitted exactly! had dozens of removed links all over the place from various chains,- all 520 too

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Steps,I carry 2 mixed boxes of std metric o rings on the van as well as boxes of plumbing standard seals!

but not really what the normal sparky would be carrying though sidewinder, is it?

 

[sellers]

I needed an O ring for a pilot variable airjet once, 18 friggin' quid,!!!then by pure accident I discovered that the O ring from a 520 O ring chain fitted exactly! had dozens of removed links all over the place from various chains,- all 520 too

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but not really what the normal sparky would be carrying though sidewinder, is it?

Shudda just cut down a 20mm open grommet job done