ZX6R (carb’d) misfire.

[Kawasaki Jimbo]

Having fixed the Yamaha I washed the ZX6R G2 (1999) yesterday, and then today took the Kawasaki to work, or that was the intention anyway. It started up first time, idled and warmed up nicely, accepted light throttle but had a weird misfire once out of the street and onto the main road. Weird because it only happened with a modest handful, it wasn’t like one cylinder just wasn’t working and there seemed no danger of stalling. I got 2 miles out hoping it would clear but then decided to go back home. It drives really well in town but had this ‘brrrrrrr’ flat note and reduced power at modest revs. Fine low down.

Tonight I drained the tank completely because the bike has been sitting with half a tank of E10 petrol since December (with a splash of Silkolene Pro FST). When I ran the bike with the intention of purging the carburettors I noticed (though not immediately) a quiet ticking sound which I think came from the right hand side, and didn’t change when I pulled the clutch in. Now I’m not sure this is unusual because I have rarely run it in the garage for a prolonged period, and usually it warms up on the concrete outside and I have ear plugs in.

I haven’t got fresh petrol yet but here’s the challenge; what might the problem be?

https://i.postimg.cc/vBT9Q0J1/E669229-E-29-F8-48-D6-9063-F2-D4-EBA73-C99.jpg

[A100man]

My bet .. A blocked main jet.
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Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[Kawasaki Jimbo]

The bike ran perfectly with fresh fuel and since it has sat longer without this problem occurring I think it must be due to E10, which I’ll avoid in future. The ticking sound disappeared and I think it might have been the fuel pump running dry. Ready for an MOT.

[A100man]

[to v or not to v]

isnt e10 fuel dodgy for the rubber used on older bikes? carbs, fuel line etc.
____________________
current bike Yamaha Thunderace.
its old and fat, but its a damned good ride. the bikes not bad either.

[UncleFester]

Yes - i refuse to run E10 in anything i own especially the two older Jap things as their fuel system has rubber pipe and gaskets in that E10 will eat away at.

If i was stuck somewhere and nothing else was available then i'd use it to get home but fill back up with 97/98 E5 ASAFP.
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Module 1 and 2 passed - October 2014. Happy owner of a 2017 Z1000SX, ex owner of a YBR125 / CB500 / VFR800.

[Kawasaki Jimbo]

I was of the view that I wasn’t going to be forced to buy the more expensive ‘Super Plus’ E5 and if rubber seals eventually perished so be it, I’d replace them then. However this incident has changed my mind, and I’ve also heard that E5 gives slightly higher mileage than E10 so the price difference may not be significant anyway.

Incidentally I’d wondered if what I’d experienced was ‘pinking’ or ‘knocking’ but I don’t think so. There was no metallic pinging sound, which is what I’m told would be heard.

[jaffa90]

Rubber pipes? as posted before i have binned all mine after dipping them in E5 and those with ok for unleaded use going slimey as well.
See pic.

[Kawasaki Jimbo]

[jaffa90]

[UncleFester]

It's not good enough to just be unleaded compatible, it needs to be a specific E10/E5 compatible rubber - which IIRC contains nitrile.

https://www.wheels-alive.co.uk/ethanol-and-classics-dont-mix-our-final-episode-of-three/

Have a read of ^^^
____________________
Module 1 and 2 passed - October 2014. Happy owner of a 2017 Z1000SX, ex owner of a YBR125 / CB500 / VFR800.

[jaffa90]

Nitrile rubber swells / softens with E5 E10 but Viton stays the same but not as pliable.

[redeem ouzzer]

So much misinformation on here but that’s what I would expect from people without 20 years experience in the industry. Most standard rubber bits in carbs etc are Nitrile. There are upgrade kits for sone things in Viton but not all Viton is the same. I’ve used aftermarket float bowl gaskets that have literally expanded after removal to the point where they won’t go back in (they sometimes shrink after a period of drying out). I wouldn’t trust any aftermarket Viton parts to outperform the OEM Nitrile originals. There are Viton grades that fuel wouldn’t touch but it seems the suppliers of these parts are not working with the higher end compounds.
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Be a REAL MAN!

[to v or not to v]

heres some rubber hose on the bay-
https://www.ebay.co.uk/itm/142385890358?
____________________
current bike Yamaha Thunderace.
its old and fat, but its a damned good ride. the bikes not bad either.

[jaffa90]

[Kawasaki Jimbo]

[jaffa90]

[jaffa90]

[to v or not to v]

[Nobby the Bastard]

Jaffa doesn't do anything right.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[Kawasaki Jimbo]

[Islander]

[jaffa90]

[Islander]

[Kawasaki Jimbo]

I think you need to buy from a reputable manufacturer and spend more than £1.