My R1 eats me.
Join Date: Apr 2019
Location: South of France
Greetings from the South of France.
I bought my R1 new in the UK in 1998 and still love its scary awesomeness. I passed my bike test in 1977 (Honda CD 175 twin) and after many bikes later, I got me a YZF R1 :-) Not many miles rolled; only 12,000 since then due to work and family commitments, but the summer of 2019 brings me to a point in time when I can get to swing my leg over it and ride again!
In the years between 1998 and 2019 it has been started and ridden of course but often sits, sometimes for years at a time in a shed on its sidestand. The last dormant period, for probably 3 years or more. I didn't drain the tank. The rear seat has been nibbled by mice (actually, they gorged themselves) but that's another story.
So now, fast-forward to today....
The bike will start from cold with no problem and runs really well (as it should) until it warms up (2+mins) and then runs lumpy. It sounds and feels like a twin. It won't idle without cutting out.
This happened in circa 2010 and it went to the shop and they fixed the issue (what they did, I don't know exactly - nothing carb-spares-related was on their invoice ) The "same" issue returns today.
After 2-3 mins running, carbs 1 and 3 can be seen wet, then petrol seeps from the carb body of #1 and drips onto the road. Not too much, but enough to smell first and then see. The carb bodies of 2 and 4 appear dry.
(Carbs 1-4 are noted sitting astride, from left-to-right).
What kind of carb kit do I need to fix this? Just the bowl gasket and some carb cleaner, or the full-monty kit with the float needle-valve assembly and idle jet screw? I'm trying to do this myself to avoid a professional and costly invoice (I've had a quote from the same shop already).
From my layman's perspective, I think what is happening is that the float needle valve is stuck down allowing more fuel into the float bowl then is required?
If I turn the ignition on, there are no fuel leaks. The fuel pump can be heard ticking and then it stops. It's only when I run the engine, that it leaks fuel.
The non-metallic cone-shaped end of the needle that governs the float bowl fuel volume - does that wear out at 12,000 miles? Should it be replaced?
I've checked the tubing from the tank from the fuel pump to the carbs. No leaks. I've gently tapped the carb array with a rubber mallet but to no avail ;-|
I am trying to fix my bike on a budget. Long gone are the days when I can just take it to shop and say, "Fix-it please?".
Any and all opinions are welcome. If I don't reply promptly, it's 'cos I'm in another time-zone.