2t Exhaust Clogged?

[.Chris.]

Hi,

Does anyone know what sort of symptoms a blocked exhaust will give?

Recently my RXS100 has decided it doesn't like revving to more than about 5.5k in 1st or 2nd gear, but in higher gears it will happily rev all the way up to 9k. When it reaches about 5.5k in 1st and 2nd it sort of splutters until you change up. The amount of throttle doesn't seem to make much of a difference.

My mate who had a 50cc Reiju dirt bike when he was younger said that's the exact same symptoms he got when the exhaust was blocked up with carbon and gunge.

If it is blocked up then how might I go about unblocking it? Would redex in the tank do any good or do I need to burn the carbon off?

Cheers
____________________
Chris
1985 Kawasaki Z550F

[hmmmnz]

take the exhaust off plug the hole and fill with caustic soda..(im sure its caustic soda) let it sit for an hour or 2 and then empty and that should have gotten out all the carbon.

on my old smokey i used to cut the expansion chamber and burn out all the carbon, the reweld it back together, (i never knew there was an easier way)
im sure some one will pipe in if its not caustic soda that you are saposed to use
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[BFG]

[.Chris.]

OK, so if the exhaust is clogged then will both parts be bunged up (i.e. the curved pipe connecting the exhaust port of the engine to the silencer) or just the silencer itself? I've unscrewed and removed the baffle from the rear of the silencer and although obviously blackened it doesn't seem too bad, nothing came out when I bashed it on the ground!

[hmmmnz]

it doesnt matter about the silencer, its the expansion chamber and the pipes that connect to it.
that need to be cleaned out.
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[.Chris.]

[DaveW]

On my Kwak AR50 I had a Micron which you could slide the baffles out of the can and used a blow torch and maybe petrol or white spirit - obviously not at the same time!! Although some good flame shooters cleared some of it!! Dishwaher liquid is always good for getting rid of carbon and oil.

When it gets coked up the engine will feel constipated and probably sound it (muffled) and will be slow to rev and feel slightly sluggish.

If it gets coked up alot, maybe try a good brand of 2 stroke oil and/or check the feed isn't too much. I used to clean the AR out every 6 months - I think, can't quite remember, it was 14 years ago.
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Yamaha R6 '05 model, upside down forks, radial brakes, Blue flame can, dubble bubble and clear turn signals - as they say in America

[hmmmnz]

yeah basically all the power is controlled by the expansion chamber,
take that off and your bike will barely run
the silencer is just there to keep the noisy smokeys quiet.
take that off and you wont even notice a difference to the way it runs
get a cork from a wine bottle and jam it end where it connects to the bike and fill her up
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[DaveW]

[.Chris.]

[hmmmnz]

get some rubber gloves while your there, the shit is nasty on the hands, especially if you have a wee cut,
and try not to breathe it in, oven cleaner has nothing on caustic sodas evilness
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[.Chris.]

Will do.
____________________
Chris
1985 Kawasaki Z550F

[Kickstart]

Hi

Personally I would say the first thing it is likely to be would be the spark plug on its last legs. Bit of a thrash in the first 2 gear cleans it enough to run OK in the higher gears.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[.Chris.]

[Blau Zedong]

Take teh baffle out and attack it with a wire brush to unclog any holes. Block the end of the silencer with a rubber bung or potato, stand upright, fill with caustic mix, leave for 12 hours, then empty and blast through with a hose pipe. Reassemble baffle and refit pipe.
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[hmmmnz]

how did it go?? chris???
no burnt skin or eyes i hope
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[.Chris.]

Haven't done it yet - been in bed most of this morning (got a bit pissed last night ).

I'm doing it this afternoon, will let you know how it goes!
____________________
Chris
1985 Kawasaki Z550F

[.Chris.]

Right, cleaned the silencer and baffle with caustic soda, set the carb up as per the manual (it was running a little bit rich beforehand) but none of it seems to have done any good .

I think the next port of call is running with some redex in the tank, after that I'll test all the components of the ignition system, if that doesn't cure it then it's top-end rebuild time.

I have a suspicion that the piston rings might be knackered because when cold it gives off quite a large amount of white smoke, and when warm it still seems to give off a bit. The haynes manual says that if the exhaust is white (and the oil pump properly adjusted, which it is) then it needs a rebore.
____________________
Chris
1985 Kawasaki Z550F

[SilvaRizla]

Itialian Tune-up

Worked on my NSR and burnt the stodge off when I got it

(Rag the tits off it on a big ride, get the thing HOT)
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I'm Ivan Dobski the Meatsafe Murderer only I never done it, I only said that I done it so they'd take the truncheon out of my bottom

[hmmmnz]

its weird that its only the bottom to gears, my guess that its your gear box.
drop the oil from oil from the gear box and replace it,
and do what silva says give it the thrashing it deserves
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[.Chris.]

It does seem to improve a bit when it's really hot (say after a 20 mile ride). If the weather holds then I'll give it a good 50 mile run over Dartmoor today with some redex in there and see if that improves things. I'll also be interested to see whether the fact I've now correctly adjusted the mixture makes any difference.

I doubt it's the gearbox as there is plenty of oil in it which looks nice and clear, the box changes fine and also the engine does sound like it's struggling a bit in higher gears, but it's just not anything like as noticeable.
____________________
Chris
1985 Kawasaki Z550F

[Blau Zedong]

Chris, Redex won't shift any gunge in the carb mate. You will have to bite the bullet and strip it down. Takes about an hour. Use an airline (or a tin of WD40 with a straw attached) to blow through all the airways and jets.
____________________
18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[.Chris.]

Well it seems to have done the trick!

Today I filled her up, put a good dose of redex in the tank and took her for a 72-mile ride over Dartmoor. It's like a new bike!

There's now no stuttering in lower gears, the engine sounds much happier and it pulls better at the top-end too. Before the acceleration would level off at about 50-55, now 60mph is obtained with ease and I managed to get 70 out of it.

Not sure what was causing the problem then, but whatever it was has now been cured.

I'm a very happy person at the moment
____________________
Chris
1985 Kawasaki Z550F

[hmmmnz]

nice. those Italian tune ups are great

still, pull the carb off, remove the float bowl clean out all the crap, pull each jet and bow it through. then pull the top and make sure the diaphragm is still in good condition.
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[.Chris.]

Will do, I may as well do that in the next couple of days as the weather forecast is a bit crap
____________________
Chris
1985 Kawasaki Z550F