Yamaha R6 2001 Cuts out! :S

[fizzy0]

Hey all

recently bought a Yammy R6 2001 in infamous BLUE

all seemed well however, today when riding it cut out on me it did this twice

checked fuel, leaks etc all ok, it would start providing i had the throttle pinned all the way back and it would idle at 2k RPM but really rough

after a while the revs shot up and then it idled perfectly and rode like normal

done this twice

crap in carbs? bad fuel? running too rich?

any help and previous experience would be awesome

thanks all

[Copycat73]

battery /reg. rectifier voltage check

millage ? valve clearances due ?
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[fizzy0]

its got 20k on, not sure on valve clearance tbh nor does the previous owner know,

may be worth a shot, but dont want to chuck money at it here and there and end up still happening!

cheers dude

[P.]

Fuel pump?

[misscrabstick]

Sounds like a fuel issue to me, I would check tap, lines, pump and any filters for cleanliness.

Maybe the pumps on the way out?

[Copycat73]

[fizzy0]

but of an update
seems to only do it when it warms up to full temp

im gonna give it a full service

and redo the valves and see it that cures it

[J.M.]

[fizzy0]

good point, however with this you can feel it bog down but you can keep it going by pinning the throttle back more only at low revs this happens btw

anything over 5k it "seems" ok

after doing the internet search it can be anything

From cracked bores, to rectifiers to fuel pump, to valve clearance and something about some balance tubes

so there doesnt seem to be a guaranteed fix for this fault and the last thing i want is to chuck money as it and realize the fault is still there!

think ill phone a few garages tomorrow and see what my options are, else ill sell it for spares and repairs

[evoboy]

Is it running hot?

Does the coolant bubble in the bottle?

If you can, take the tank off and check to see if its blowing exhaust gas out of the crankcase breather.
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[cb1rocket]

Excuse my knowledge on the r6 but is this carb or FI?
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[Copycat73]

[fizzy0]

r6 is carb model upto 2003 after that FI

Been doing some more reading up

and sounds like either valve springs or cylinder bore cracked

im doing a compression test over weekend hopefully rule out the pistons but im never that lucky

I shall keep this thread updated to help others with same problem present/future

[P.]

Cracked bores are common apparently

[fizzy0]

[P.]

Thing is, there are bad things about ALL bikes, luck of the draw.

I bet if you bought a VFR or CBR, the regulator would have went, Thundercat would be missing 2nd gear and an RS125 would be 20 secs away from its main bearing failing. It's just how it is buddy

[misscrabstick]

I looked into this cracked bore thing a bit on the internet, I don't see that you have this issue, a wet liner type engine with a cracked liner/bore is going to display head gasket blow type symptoms such as coolant loss/boiling over, exhaust steam, coolant in the sump and a misfire, and would this occur on all 4 cylinders at the same time? no, you also indicate that your bike recovered from this issue after a short time and ran normally, I stick by what I first said, you have some sort of fuel issue.

[misscrabstick]

Check your tank is venting ok, a blocked vent can restrict the fuel supply effectively.

[fizzy0]

[thelamoth]

Check your fuel pump, my old 5eb had exactly the same symptoms.

They tend to burn out, not a well known common problem and not a hard fix.

[fizzy0]

hey all

abit of an update, i disconnected the pipe that went to the top of the airbox (breather pipe), let the bike warm up but there doesnt seem to be any smoke coming from it, which rules out blowby, so not a fucked engine thank jesusallahbuddha

fuel pump is ok, however the oil was low (due to leak) and the coolant was low too ive topped them both up and will take for a ride later to see if probs still there,

just happy its not the engine

[Robby]

When was it last serviced?

Before worrying about the engine being fucked, make sure it has a clean air filter and new spark plugs.

[misscrabstick]

Fuel pump may seem ok when you check it, but....... often they piss around intermittently for a very long time before going toes up.

[fizzy0]

not sure when it was last serviced, but waned to find out if engine was ok before i started to order parts

saying that, I did notice that both air intake pipes going into the air box were disconnected for some reason,

another theory is at low speed the air wasnt getting in making the mixture too rich/flooding the engine?

Ive put them back on, let it get upto temp and checked the breather once more, still all clear

Im going to take it for a test ride when the traffic dies down and report back

thanks for all the advice and help so far

[MistreKul]

Any news on this? I'm having similar issues, poor idling and rough running below 5k, when it's getting hot (above 90 degrees). I'm hoping it's just the carbs which need a tune/clean up, but the dreaded liners issue lurks in the back of my brain..

And before someone says it, yes, I did notice this is a very old tread, the spider web makes it pretty obvious, thanks. It's still relevant and there's no point in making another thread.