Had a ride out last week and after 2 miles started missing at lower revs and eventually stopping completely.
Now it will start but dies a second later. I have tried a new coil but has made no difference.
Any ideas what to try next?
Cheers, Ian.
fuel issue at a guess
I would also check fuel side first, trapped/kinked fuel line, blocked fuel filter if used, then block carb jets, sticking float. If the plugs are wet then check for strong spark. How old are the plugs/is the fuel fresh?
In my experience if you "loose low end" first it's the pilot jets/passageways silting up with fine rust/crud. If you don't have fuel filters fitted I would almost guarantee it's the pilot circuit.
Vacuum fuel tap? If yes, ?faulty or vac pipe split - try PRI position.
Best of luck, Laurie
Quote from: thump566 on May 05, 2025, 08:42:01 AMI would also check fuel side first, trapped/kinked fuel line, blocked fuel filter if used, then block carb jets, sticking float. If the plugs are wet then check for strong spark. How old are the plugs/is the fuel fresh?
Id like to think it was simply a fuel issue.
how long was the last fuel sitting in there for? (even if it was just this winter then the fuel has already broken down)
once the rubbers gaskets etc have started to rot due to the fuel then they'll need changing. been there do that got the damn repair bill.
ethanol free fuel is the only way forward.....
RESULT Thanks everyone, previous owner had fitted an in line filter and although it was clear it was restricting flow.I guess a result of the crap petrol we get now.
Cheers Ian
I started to use E5 petrol a few years ago when E10 became the normal? petrol.
E5 gives better engine response and mpg and less likely to perish all the seals and hoses in the fuel system.
The only downside is that it costs more per litre but is a small price to pay.
+1 for E5 - in my case Tesco Momentum 99RON, only stuff available round here. I also add this stuff (https://motorex.com/en-us/ethanol-treatment--18802) without knowing how it works, or indeed if it works. Trusting soul, me.
I've read that Japanese gas is 100RON and the R1-Z looks to have a more advanced ignition curve than a 1KT, so 99RON seems a reasonable precaution.
May be wrong on all the above counts, of course.
Laurie
Quote from: biggz on May 15, 2025, 11:38:22 PM+1 for E5 - in my case Tesco Momentum 99RON, only stuff available round here. I also add this stuff (https://motorex.com/en-us/ethanol-treatment--18802) without knowing how it works, or indeed if it works. Trusting soul, me.
I've read that Japanese gas is 100RON and the R1-Z looks to have a more advanced ignition curve than a 1KT, so 99RON seems a reasonable precaution.
May be wrong on all the above counts, of course.
Laurie
https://youtu.be/UvS_D4_lF5U?si=irupDgMbPRdWkjEt
THIS IS ESSENTIAL TO WATCH, then you'll understand why we buy ethanol free fuel.
Quote from: jamietzr250r on May 20, 2025, 05:37:33 PMQuote from: biggz on May 15, 2025, 11:38:22 PM+1 for E5 - in my case Tesco Momentum 99RON, only stuff available round here. I also add this stuff (https://motorex.com/en-us/ethanol-treatment--18802) without knowing how it works, or indeed if it works. Trusting soul, me.
I've read that Japanese gas is 100RON and the R1-Z looks to have a more advanced ignition curve than a 1KT, so 99RON seems a reasonable precaution.
May be wrong on all the above counts, of course.
Laurie
https://youtu.be/UvS_D4_lF5U?si=irupDgMbPRdWkjEt
THIS IS ESSENTIAL TO WATCH, then you'll understand why we buy ethanol free fuel.
Ouch. Looking at prices and availability of ethanol free (out here): prohibitive and limited in that order. You could argue to tear the carbs apart when problems arise, and use the cash saved through running pump fuel to buy the parts to refurbish where necessary...
L
So depends on where you are in the country (IF UK) there is the options of RSUR from Anglo American Oil.
They are based in Poole but they have Winchester Garden Machinery (https://www.gardenmachinerydirect.co.uk/) as stockists who have the 50L drums on their system.
There are are a few of us down in the South who now run this. I forget if this is what you run Jamie?
They do offer delivery but not sure if nationwide.
I thin my lastest calculaltions worked out it to be about 3.70 a litre which, granted is expensive but I think when you total up the time and materials for rebuilding carbs including US cleaning, replacing fuel lines, fuel taps and filters then it's probably worth it.
On top of that, the risk of water collecting and sinking into the tank which is what causes those rusted out tanks...
...and then on top of that the thought that the fuel does come into contact with crank seals too, albeit fixed with oil, it's another factor.
Aside from the cost, the other limiting factor is range. You can't just go top up at a petrol station so you're limited by one tank of fuel unless you carry a can on fuel in a back bag like some kind of Mad Max scenario...no names mentioned here ;D :-X ;).
I'm currently thinking about what sort of fuel bladders are out there that would fit in the storage container if I ever needed to do a longer trip but let's face it, these aren't touring bikes and although I've yet to find out the range of a tank I suspect wrists and backs would give out before depleting the tank.
on my 3xv a tank of juice will get me around 90 to 100 miles taking it easy.
in the us i run mine on 10% 93 ethanol and zero issues. just fyi.
Since they introduced E5 in the UK which is a long time ago now I haven't really noticed any difference. Sure I've had a few fuel hoses go hard, a couple of fuel taps leak, a couple of float bowl seals expand, and bought bikes with gummed up carbs, but all of these problems were so common before the ethanol that it's hard to guage if they're any worse or not.
If the problem comes back open the petrol cap and see if there's a rush of air, the breather passages can block.
Petrol around the UK is different. I believe that there are five petrol distribution centres and can you say for certain that each has EXACTLY the same blend/mix.
As for issues with bikes, things to consider are how often you ride, how much fuel you put in a tank to ride and how much is left in the tank. Where you keep it, indoors garage, shed or even a house. Is it kept outside covered uncovered.
All these things are a part of the potential possibility that failure can (and will) happen.
(Andy) I use ethanol free storage pluss 99 Ron, 3 year+ shelf life.
My tzr had both carb seals break down on the emulsion tube, and the carb bottom seal go. £375 to repair. So as I pay about £250 for 50 ltrs fuel a year yes it is worth it. Knowing I can get the bike out and within 6 kicks she starts and runs like it did when leaded fuel was available.
It's your choice what you feed your pony but I feed it the best she deserves.
try this. 1 oz premix per 2 gallons fuel. let sit, you'll be amazed how well it preserves the fuel. I've set it for 2+ years w no change. I'm sure this will help w the uk fuels as well. common trick here for large displacement touring bikes with carbs. yes, 4 strokes.
Quote from: m in sc on May 27, 2025, 08:31:41 PMI'm sure this will help w the uk fuels as well.
You'd like to think so but unfortunately Uk and Us fuels are very different. Yes there are both petrol based but that's where the similarities end. The additives are very different. (some US additives are banned in the UK and Europe).
so premix doesn't work in uk fuels? lol. that's ridiculous. also guess what country i heard about this from? GTR1000 in the concours forums... which is a uk version. fwiw this issue def sounds electrical.