Carburetta conundrum?h

nop · Scooby Slapper Joined: 12 Sep 2011 Karma :

So I have just passed my test and have a badass bike. woot. Alas there is a small problem (as always).

I have an Yamaha XT600. This bike has a twin carb. It runs fine (a little bit tough to kick start). The problem is when I am stopping and brake sharply, the front end dives (which is what I would expect from long travel suspension) and the engine cuts out. This has become quite embarrassing at traffic lights as you may guess. I am sometimes able to stop the cutting out if I give the throttle a bit of a rev as I come to a stop. There is always a strong petrol smell to the exhaust when I do this.

Is this a carb problem? If so, what would be the best route to diagnosing it?

orac · World Chat Champion Joined: 25 Sep 2011 Karma :

strip, and clean the carb, also check the float hights. my GS5 used to do it, it seemed to stop after giving the carbs gppd clean.

it may be worth checking to make sure the jets sizes are correct (some one may have fannied around with it at some point)

spyuggy · Nitrous Nuisance Joined: 29 Aug 2011 Karma :

It sounds like the floats are too high and not enough fuel in the chamber, when you brake hard the floats move and stop the fuel entering the chamber, could be fuel starvation.
Alternative method====don't brake so hard, it knackers up tyres, brake pads, suspension and even accelerates chain wear.
Good luck with it.
____________________
Treat each day as if it was your last, because one day you will be right.

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

check the float height and the condition of the float and needle. I would replace the needle as a matter of course.
____________________
Some shite cruiser. Now with guns and FREEDOM!

nop · Scooby Slapper Joined: 12 Sep 2011 Karma :

Thank you, I will strip and inspect the carbs this weekend and report back.

nop · Scooby Slapper Joined: 12 Sep 2011 Karma :

Can I pump a load of brake cleaner through my carbs?

i.e. remove the fuel inlet hose, open the carb drain plug and pump like a can of brake cleaner through?

Or is this a retarded idea that will rape my o-ring?

Johnser · Renault 5 Driver Joined: 19 May 2011 Karma :

you really ought to dismantle and clean... would want to run the risk of having your O-ring raped? (snigger)

if you did want to try it, I'd go with carb cleaner rather than brake cleaner - possibly chemically identical but it'd be nice to think someone thought about its application when making it

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

nop · Scooby Slapper Joined: 12 Sep 2011 Karma :

God DAMNIT.

My engine stalls when I brake hard. It reaks of petrol, is running well rich and I am getting shit MPG. When it stalls it is like the bike is choking. Like there is something choked on the engine, like the engine has some kind of choke and it is on all the time choking.

Like the choke is on all the time. Like I didn't know which way around the choke works.

Derp.

https://photoface.webs.com/photos/Random-Photos/I-can-count-to-potato.jpg