XR650R Mikuni TM40 or Edelbrock?

[Kiko]

Originally Posted by BMKTW2

My Mikuni floods all the time. My XR is still out in the wood where it left me, stranded for the millionth time, I walked home...
It runs awesome on the street and on fire trails but when you try and ride in the woods and you go over steep mounds, or god forbid you tip over the top heavy elephant, it floods and shuts off then will not start back up until it has fully cooled down. I put a new iridium NGK plug and it worked good for a few months now back to being stranded.
What gives?!

If you have one of the gas tank fuel vent hoses with check valve, remove the check valve and install only an open fuel vent hose. There is a warning in the Mikuni manual about the check valve causing problems with fuel delivery and float levels.

[BuRPsa]

Time to come clean.
For quite a while I've been advising to use the 27.5 idle jet instead of the 25, for reason to keep the engine cooler at low revs/pace. Oh, airjet 1.2, altitude 1100-1700m HASL, temp ~30C.
Well, it doesn't, or not enough, on my last trip it boiled over again, in an area even where I'd have thought the wind/speed was enough.
So, I'm going back to the 25: better idling (perfect doesn't exist but it's close), and getting as hot & as quick (maybe a tiny notch quicker) as with the 27.5 it seems.

[ZXRaziel]

Originally Posted by BuRPsa

Time to come clean.
For quite a while I've been advising to use the 27.5 idle jet instead of the 25, for reason to keep the engine cooler at low revs/pace. Oh, airjet 1.2, altitude 1100-1700m HASL, temp ~30C.
Well, it doesn't, or not enough, on my last trip it boiled over again, in an area even where I'd have thought the wind/speed was enough.
So, I'm going back to the 25: better idling (perfect doesn't exist but it's close), and getting as hot & as quick (maybe a tiny notch quicker) as with the 27.5 it seems.

What jets are included in the new set from power barn ?

[BuRPsa]

No idea, never bought from them

[jm-2008]

[QUOTE=ZXRaziel;21139076]What jets are included in the new set from power barn ?


Nice chap, very helpful.
Specified what I wanted and thats how it arrived
Ordered a number of extras after the event and they arrived in a few weeks.
You are closer than we are here in OZ so it may be quicker for you.

Some of us (Ridefreak/Myself and others) sent back our settings and he (Mike?) may have a database for the XR650R by now.
That info should be a good place to start based on your elevation/motor/exhaust/air filter config.
Ridefreak is up fairly high in NewMexico so his data may not be appropriate for you in the UK.
I ride between 3000-4500 feet as a rule so can dig up my settings if your'e interested.
Runs acceptably well at lower levels as well
JM-2008