Uncorking XR 600
Posted November 10, 2007 - 02:55 PM
Dead horse. Big stick. Healthy beating. yadda, yadda, yadda.
I've just spent over an hour searching several posts from the last couple of years about what to do to properly uncork the XR 600.
Most are pretty similar, but there is enough variation (maybe due to altitude and temperature?) between all the posts that there doesn't seem to be a single no-fail, for sure answer on what the best jetting is.
I know that my bike is absolutely bone stock.
I'm gonna put a Yosh full system on it in the next week or so, and I plan on evaluating the entire intake/exhaust tract.
Never gotten inside the carb before, so I really don't know for sure what kind of jetting it currently has, but I will probably run a 68 pilot and 155 main, needle in either the 3rd or 4th position.
We'll see how this works out. I intend to start messing with it in a few days, so I'll be resurrecting this thread from the dead on a regular basis as I have time to work on it.
Does a 68pj and a 155mj sound about right for SoCal?
Posted November 10, 2007 - 04:21 PM
With an aftermarket system you may need a 158 or even a 160 mj. The only way to know is to try them out. You can change the main jet and needle position without removing the carb.
Check your choke plate. The little flapper is know to fatigue off and get sucked into the engine.
Posted November 10, 2007 - 05:27 PM
Looks like the stock set-up is supposed to be a 62pj and 152mj. I'll crack open the carb and see what it's got first, though I suspect that's what I'll find.
cleonard, my air box has the snorkel in place, held on by two rivets. Like I suspected, totally stock. Thanks for the heads up on the choke plate, I read about that while I was researching my mods, I guess SRC sells a modified plate (or is it XR's Only?). How common is this problem, has anybody here lunched their mill due to this?
This upcoming week's going to be super busy for me, but I'm gonna try to find the time to uncork, pipe, and jet.
.... must learn the way of the pig..........
Posted November 10, 2007 - 05:46 PM
I totally removed the choke from my carb. I thought that it was going to be hard to cold start, but with the 68 pilot is has not been bad at all. If it is below 55 or so I have to lay the bike over so it floods a little bit. I have started it down to a chilly 30 this way. I have an aftermarket choke plate, but the bike has been easy enough to start so I have not installed it.
Posted November 21, 2007 - 10:38 AM
Found something really weird that I just cannot explain. There was a 125 main jet in it. Not a 152, which is what the stock main jet should be, and no, I am not dyslexic. It definitely reads "125". I don't get it.
Anyway, I've got a question for you folks about the "uncorking" procedure.
I drilled out the two rivets and removed the restrictor from the top of the air box. Is that all that needs to be done to the box? Should I run it without the side cover that gains access to the filter (left side of bike), or would that be too much air getting in?
Should I cut a hole on the opposite side of the air box (right side of bike) and rivet some screen to it?
I know that removing the snorkel from the top of the box really opened it up, but I just want to know if that's sufficient.
I put the Yosh full system on and installed a 68 pilot and a 160 main.
It started up pretty easilly and maintained an even steady idle and revved up briskly without stumbling or back firing. Seems to return right to idle without hanging up.
So far jetting seems okay, but I haven't ridden it yet. Hopefully in the next day or two.
I would have included a photo or two, but my wife is in San Diego for the day with our digital camera.
Posted November 21, 2007 - 06:12 PM
I would stay at 3rd clip on the needle. You don't need to open up the sides of the airbox as long as the snorkel is removed.
Posted November 29, 2007 - 04:37 PM
Once the octopus is off, do you guys attach a vent filter directly to the vent on the engine, or do you run some 1/2" hose up under the seat and mount a filter there?
Ever had problems with oil puking out of the hose/filter (after a fall, for instance) since the catch bottle is no longer attached, or do you guys add a catch bottle? I'm just going to cap off the vent return hose to the airbox, but the crankcase vent obviously has to be functional. The hose coming off the carb that tied into the catch bottle should just be a vent line that can be opened to the atmosphere, right?
here are a couple of photos showing what I'm talking about.
Open vent on crankcase and front of airbox.
Octopus (catch bottle with associated hoses).
Hey Redlines, here's a pic of the snorkel/restrictor that I removed from the top of the airbox. Notice the holes on either side where I drilled out the rivets that were holding it in place.
Posted November 29, 2007 - 05:01 PM
Here's how he did his on his 650R, so I'll rig up something similar on my 600.
Posted November 29, 2007 - 10:04 PM
its not in this pic., but if you can imagine, its mounted just to the right of the upper shock mount. viewed from the top, looking forward.
Posted November 30, 2007 - 01:12 AM
Below is a link to the snorkels that just pull out of the top of the airbox that I have always yanked and thronw away, you rarely see them. I couldn't figure out how to post a pic in the thread, so click the link below to view it. If you have a 2000 XR600R with the red tank and oem silver frame paint I think those looks sweet.
Posted December 01, 2007 - 09:03 PM
Now for the results..... Daaammmmmnnn! I thought uncorking, jetting, and putting a full exhaust system would give me a liitle more power here and there and be most noticeable on top end, but I've got loads more power throughout the RPM range, everywhere.
This set of mods definitely woke my bike up.
Here's a shot I took today.
Posted December 02, 2007 - 06:00 AM
Posted December 02, 2007 - 06:09 PM
Posted December 02, 2007 - 11:00 PM
Posted August 18, 2014 - 08:29 AM
I have a 2000 cali model 600R I bought a couple of months ago. Low hours 100% stock. My airbox snorkel was riveted. Removed it. Removed the crank case canister and routed directly to the air box. Installed Summers jetting, 68 pilot and 155 main. 49 state needle 3rd position. Part numbers for the needle are different between the Cali to 49 state model. Installed 49 state insulator boot. On the cali model the orifice on the insulator boot is about 1/2 the size of the 49 state model. Changing it really opens up carb flow. Still have stock pipe. When I first rode the 600 I thought it had a little more torque and was a little faster than my 400. Was nice but not all that impressive. After the changes the bike now has a lot more torque and speed everywhere. It's almost intimidating. Amazing difference with these changes. Was thinking about aftermarket pipe - now I'm not sure but don't feel any urgency.
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