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Old 08-18-2010, 06:59 AM   #5116
baja_brewer
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Quote:
Originally Posted by windquest
Welcome! If the bike is uncorked the following will apply:

Main jet- 170, 172, 175 (this should cover you from 80-60 farenheit)
Needle clip- 3 down from top (this is with a B53E needle)
Pilot- 68s
Thanks for the quick reply! One of the reasons I picked this bike was because of the cult following Not poking fun, I plan on joining inJust need to get a little knowledge first!

The bike is uncorked. Just to clarify, I can chose from between the 170, 172 and 175?

Last question: Suggestions for 40-60 *F? Fall is coming in New England...
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Old 08-18-2010, 07:14 AM   #5117
RedBirdStation
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Here try this, hope it helps out

http://www.xr650r.us/jetting/
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Old 08-18-2010, 07:47 AM   #5118
baja_brewer
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Quote:
Originally Posted by FLCBRXX
Here try this, hope it helps out

http://www.xr650r.us/jetting/
Thanks! I've seen that, I'm just trying to wrap my head around it....

Looks like I'd go:
Main jet- 175
Needle clip- 3 down from top
Pilot- 68s or 70

I imagine I'll be better once I get some hands on time working on the bike!
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Old 08-18-2010, 08:28 AM   #5119
zaptoad
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Location: North Idaho
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an eye to the weary

talking about reflectors, license plate lights, etc, etc......

http://usridernews.com/2010/08/12/nh...y-checkpoints/

With an Idaho registration, the XRR's have "not necessarily street legal" printed right on them in bold letters. This always makes me nervous about getting stopped any time, any state, so I ride very carefully on the street. I have been modifing my bike to look more like a real street bike all the time so as not to raise suspicion. I am even planning on converting to a low front fender(UFO Superbiker in black) this winter. However, with bull stops just targeting bikes, we don't have a chance.
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Old 08-18-2010, 09:17 AM   #5120
larryboy
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Quote:
Originally Posted by baja_brewer
Thanks! I've seen that, I'm just trying to wrap my head around it....

Looks like I'd go:
Main jet- 175
Needle clip- 3 down from top
Pilot- 68s or 70

I imagine I'll be better once I get some hands on time working on the bike!

175 is too rich at sea level unless you have the airbox cover opened up.

I'm at sea level.

Main-165
53E needle-clip 2 down from the top
Pilot-68s
Closed airbox
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Old 08-18-2010, 10:02 AM   #5121
baja_brewer
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Quote:
Originally Posted by larryboy
175 is too rich at sea level unless you have the airbox cover opened up.

I'm at sea level.

Main-165
53E needle-clip 2 down from the top
Pilot-68s
Closed airbox
Thus why I'm asking, thanks for the help! I've yet to pick up a new one, but I've been told they're cheap, so I can always mess around with it once it gets colder out.
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Old 08-18-2010, 11:45 AM   #5122
cdogg44
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Location: 50 Miles From Oark
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Quote:
Originally Posted by windquest
Welcome! If the bike is uncorked the following will apply:

Main jet- 170, 172, 175 (this should cover you from 80-60 farenheit)
Needle clip- 3 down from top (this is with a B53E needle)
Pilot- 68s

What main jet would you recommend for me?

I have a 68s, 53E needle at 3rd clip, stock Honda air filter and cover, drilled stock exhaust, XR's Only smog block off kit.

Ambient temps here are 90-100+ and I'm at 450-500'.

I've got a 175 in it right now but think I'm running a bit rich. Am I correct in thinking that I need a bigger main jet the cooler the ambient temp is? Does humidity play any factor in jetting?

Thanks
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Old 08-18-2010, 12:57 PM   #5123
lstzephyr
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Location: Huntsville, Al
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Quote:
Originally Posted by larryboy
175 is too rich at sea level unless you have the airbox cover opened up.

I'm at sea level.

Main-165
53E needle-clip 2 down from the top
Pilot-68s
Closed airbox
I'm at 1000 ft

Main-178
Needle is at 1st clip
pilot-68s
Open airbox, white brothers pipe

All these bikes are different really, the jetting just gets you close. So might as well throw as many working setups as possible out there.

You mention 53E needle, are there a lot of needle available? I didn't know that was something I could swap for tuning. Can anyone explain the effect of the needle change to me?


With carbs you are adjusting the main jet to air density. Altitude, temperature, humidity(I think), all affect it. So if its way hot out lower your jet, if its cold put a bigger jet in, if you go up in altitude smaller jet, down in altitude bigger jet. For example, I was running a 155 main at 8k feet and 85 degrees or so, I ran a 185 main at 1k ft and 85, and now run a 178 at 1k ft and 100 degrees. Does that make sense?

lstzephyr screwed with this post 08-18-2010 at 01:03 PM
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Old 08-18-2010, 10:41 PM   #5124
Daveoz31
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Hey Guys I have a few problems with my pig..

One. it has a nasty Wobble through the front end around 100 klms I have checked and changed a lot of things on the bike like tyres and pressures checked swing arm bearings steering and no play anywhere the steering is very light... anyone out there with similar probs or remedies?

Two. Is there a tank bag that suits the bigger tank I have fitted?
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Old 08-18-2010, 11:19 PM   #5125
larryboy
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Quote:
Originally Posted by lstzephyr
I'm at 1000 ft

Main-178
Needle is at 1st clip
pilot-68s
Open airbox, white brothers pipe

All these bikes are different really, the jetting just gets you close. So might as well throw as many working setups as possible out there.

You mention 53E needle, are there a lot of needle available? I didn't know that was something I could swap for tuning. Can anyone explain the effect of the needle change to me?

The key on your jetting is the open box, close that and it'll be way to rich.

I've been taping the airbox for riding down here at sea level and it's just a tick lean with the 165 main. I don't ride the 'R much down here and 10,000 feet is within a couple hours. It's nice to be able to pull the tape around 4500 feet and be good to go up to 12,500 feet, it was even a one kick to get going over 12k.

Different needles have different tapers to them. I've got three different ones and for performance the 53e works the best, I could probably pick up some mpg's with the stock needle.

I think the 53E needle was devoloped by HRC for Baja, others here know more about that stuff than I do.
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Old 08-19-2010, 01:25 AM   #5126
KASUYAHO
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Location: Aussie Land
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Quote:
Originally Posted by cdogg44
What main jet would you recommend for me?

I have a 68s, 53E needle at 3rd clip, stock Honda air filter and cover, drilled stock exhaust, XR's Only smog block off kit.

Ambient temps here are 90-100+ and I'm at 450-500'.

I've got a 175 in it right now but think I'm running a bit rich. Am I correct in thinking that I need a bigger main jet the cooler the ambient temp is? Does humidity play any factor in jetting?

Thanks
170 main jet is what i would go.
We use the needle to fine tune the air fuel mixture,
raise clip, lowers the needle, makes it leaner.
Lower clip, raises the needle, make it richer.

Yeh bigger main jet is needed as the air gets cooler, cooler air is more dense, more oxygen in the air.
Yeh humidity does play a part in jet sizes, more humidity a smaller jet is needed.
More moisture in the air, less oxygen, smaller jet.

What i do is soak the carby over night in solvent,
unleaed fuel forms a film of gum inside the carby.
Note: take out the aircutoff diaphram as solvent swells this diaphram.
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Old 08-19-2010, 04:30 PM   #5127
BigToad
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Location: Vancouver BC
Oddometer: 193
Quote:
Originally Posted by Daveoz31
Hey Guys I have a few problems with my pig..

One. it has a nasty Wobble through the front end around 100 klms I have checked and changed a lot of things on the bike like tyres and pressures checked swing arm bearings steering and no play anywhere the steering is very light... anyone out there with similar probs or remedies?

Two. Is there a tank bag that suits the bigger tank I have fitted?
Did you balance the front tire when replacing the tires? I had a similar problem that was eliminated by balancing. Also check the spokes and the rim to see if its true....

good luck!
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Old 08-19-2010, 05:19 PM   #5128
RideFreak
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I'm running a 165, open airbox, and HRC tip, it's a little lean at 5500' and worked nicely up to 13,600', slightly rich up that high but it's not like I could haul ass over some of those peaks

I've noticed the way you service the air filter and the oil you use makes a noticeable difference. The no toil stuff is thinner and gives me a slightly leaner mix while the Bellray is thicker and the motor runs a little richer. Also an extended ride (2~3 days) on the same filter will start to pull some of the oil out of the filter causing it to lean out a bit. I don't have an issue with it getting clogged up with dust, it's just the opposite.
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Old 08-19-2010, 06:17 PM   #5129
NMTrailboss
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Location: Albuquerque, NM
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Quote:
Originally Posted by RideFreak
I'm running a 165, open airbox, and HRC tip, it's a little lean at 5500' and worked nicely up to 13,600', slightly rich up that high but it's not like I could haul ass over some of those peaks

I've noticed the way you service the air filter and the oil you use makes a noticeable difference. The no toil stuff is thinner and gives me a slightly leaner mix while the Bellray is thicker and the motor runs a little richer. Also an extended ride (2~3 days) on the same filter will start to pull some of the oil out of the filter causing it to lean out a bit. I don't have an issue with it getting clogged up with dust, it's just the opposite.
RF...what kind/brand of air filter are you using on the BRP?

Has anyone had problems with the BRP allowing fine dirt into the air box no matter how well you service and seal the air filter element? I've tried three different brands of filters and greased the edges, serviced the hell out of the filters and still seem to have a fine, fine layer of dust on the inside of the air box each time the filter is removed. Prematurely wearing the intake valves too. WTF!
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Old 08-19-2010, 08:13 PM   #5130
AKASY
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Air Filter

Quote:
Originally Posted by NMTrailboss
RF...what kind/brand of air filter are you using on the BRP?

Has anyone had problems with the BRP allowing fine dirt into the air box no matter how well you service and seal the air filter element? I've tried three different brands of filters and greased the edges, serviced the hell out of the filters and still seem to have a fine, fine layer of dust on the inside of the air box each time the filter is removed. Prematurely wearing the intake valves too. WTF!
Me three--same issue, dumped the K&N and I'm now back to the original filiter. I think it has to do with the side panel being opened up--if I can ever find an unmolested one I will get it and see how that works.
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