Jetting

[brokenheadbrad]

I have a 2012 XCR 300 with 2 rides on it. Its been re jetted but seems to be running rich (bogs at low RPM and drools oil out of the exhaust all the way down and drips onto the swingarm). I live at 5000 feet and ride between 7000 and 12000 feet. I'm mixing 50 to 1 full synthetic oil. I don't know what jets were put in it or where the need position is. Anyone ride up here in the thin air? suggestions would be helpful. THX!

 

[gasmonkey]

You'll have to find out what you have in there(jets,needle,clip pos)
Pull the carb to do this,also to set float level.
Then the jetting gurus on here can advise and send you in the right direction.

 

[Jakobi]

Yep! Pull the carb. Find out what model carb it is. PWK AS1/AS2. Screw cap? or a flat metal cap? How deep is the fuel bowl? If its a flat metal cap does it have a number printed in the top? 36 or 38?? Then pull the slide out and check if it has a notch on the bottom edge. Look under there and see what number is stamped next to the little star. Then 6mm socket and remove the needle. Have a look whats stamped on that and what position the clip is in. Depending on the carb you may be able to get the main and pilot out without taking the bowl off. I would do that to check the float level anyway.

The 2T jetting section has a sticky at the top for the float setting.

 

[BryanMcc]

jetting

i settled on a JD red needle, in clip pos 2, 165 main, 40 pilot, no spooge, i ride 5 to 8k. these are summertime settings, when the temps drop ill richen it up a bit.

 

[brokenheadbrad]

When i get some time this week i'll investigate the carb more and give more detail about it. Really quick tho do you guys oil drip out of the exhaust? I've heard some peoples gasser do that even tho they feel the jetting is spot on. The last 2 rides oil has run out of the tail pipe, run down the length of the silencer and dripped all over the swing arm, shock and linkage. It kills me cuz it's such a beautiful bike i hate to see oil all over it's back side. Plus it make cleaning the bike that much more difficult.

 

[Jakobi]

Mine spooged like crazy and was really poor on fuel. It would load up in single track and take a bit to clear out. Moving the stock needle down a clip pos helped but put me on the top (leanest positon). The bike was still rich off the bottom but the mid felt ok. Bike didn't idle well either and the idle screw was wound right in to the stops.

Jetted crisp now. Perfect plug colour. Oily ring around the extaust tip. Still get some oil at the join between the silencer and pipe but doesn't drip.

 

[brokenheadbrad]

ok good info jak. Mine is the same way oil drip, bogs off bottom., loads up in the tight stuff and wont idle at all. I played with the idle screw first i turned it all the way in then all the way out and it didn't seem to change it at all! I called Motoadventure and Bruce said he would take a look and re jet it. I'll let you guys know what i find out.

 

[gasmonkey]

My ride is jetted similar to Bryan's above but a whole lot fatter main.Oem settings it spooged like yours and ran like crap.Now it has great milage and a light black ring around it's date.Runs like an electric motor until it gets on the pipe,then watch out for the trees.

 

[Jakobi]

brad, probably best to take the time to learn how to do it yourself instead of palming it off to the shop. Its an invaluable skill to have and something that you don't really understand until you do it, but once you do you'll realise its not that complicated. I don't know the shop so can't comment on what they will do for you, but odds are they will continue to work with the stock needle and possibly just lift the clip 1 pos. If you give us the info requested above re whats in it and the particular carb model (post pics if thats easier). We'll be able to give you some recommendations for needles. For less than $50 you should be able to have enough brass and a few needles to have it running like a champ. I use a $10 yamaha needle in mine which I feel works better than the JD Red (which I have also tried). Very smooth off the bottom and an absolute machine when on the pipe!

http://www.youtube.com/watch?v=Ky2CsihX5_g

 

[Jakobi]

Here is a perfect example of what they run like stock - http://www.youtube.com/watch?v=fPMTIvIrfTQ - No idea who's video it is and its been sped up but you can hear it continually 4 stroking and not taking revs cleanly.

 

[BryanMcc]

brad, probably best to take the time to learn how to do it yourself instead of palming it off to the shop. Its an invaluable skill to have and something that you don't really understand until you do it, but once you do you'll realise its not that complicated. I don't know the shop so can't comment on what they will do for you, but odds are they will continue to work with the stock needle and possibly just lift the clip 1 pos. If you give us the info requested above re whats in it and the particular carb model (post pics if thats easier). We'll be able to give you some recommendations for needles. For less than $50 you should be able to have enough brass and a few needles to have it running like a champ. I use a $10 yamaha needle in mine which I feel works better than the JD Red (which I have also tried). Very smooth off the bottom and an absolute machine when on the pipe!

http://www.youtube.com/watch?v=Ky2CsihX5_g

do you feel the JD red took away some of the hit? Due to broken gasgas (my fault) the carb off my gasser now is on the wr300, seems it took away some of the hit on it also compared to stock mikuni
. no less power just smoother

 

[BryanMcc]

My ride is jetted similar to Bryan's above but a whole lot fatter main.Oem settings it spooged like yours and ran like crap.Now it has great milage and a light black ring around it's date.Runs like an electric motor until it gets on the pipe,then watch out for the trees.

what elevation and temps were you riding...Just curious.. mine ran okay at 4k feet 70-85 degrees far, but at six k feet same temps sometimes wouldt clear out sometimes

 

[gasmonkey]

0-1500ft and 60-70 deg.I've never ridden at higher elevations so cannot comment on that.
The op is certainly worlds away from the conditions I ride.The jd instructions cover this though.
It seams that the As 2 loves it lean.

 

[Jakobi]

I go up to 3000ft/1000M and have run as small as a 172 in mine, mind you I was running the N3CJ#2 for this too.

I didn't find the JD Red weak. Just a bit boring with the 2K3 ignition. It was a bit richer on the bottom end than I prefered (in clip 3) and very smooth transition through the midrange. Considering thats what JD claims its not a bad thing. Just not my cup of tea. Agree with Gasmonkey - the ASII 38mm appears to like quite lean jets.

 

[hannesd]

concerning the dripping exhaust : the silencer might allready be loaded with oil from previous rides, maybe some fresh packing might solve most of the dripping... along with some leaner jetting to prevent it from loading up again

ciao, Hannes.