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Old 06-18-2013, 03:37 PM   #60046
mcma111
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Originally Posted by Olderslowerguy View Post
You are correct, Steve!

I love being correct.

Do I get a cookie??
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Old 06-18-2013, 03:55 PM   #60047
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Quote:
Originally Posted by mcma111 View Post
I love being correct.

Do I get a cookie??


There you go Steve!!!
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Old 06-18-2013, 04:27 PM   #60048
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Quote:
Originally Posted by mcma111 View Post
I love being correct.

Do I get a cookie??
Just don't try it with the wife.
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Old 06-18-2013, 05:11 PM   #60049
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Found an interesting read on tuning FCR carbs explaining one persons ideas of how all the adjustments affect fuel charge and power including what to look for on your lambda sensors.

http://patrick.my.cape.com/brm/carbkei.htm
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Old 06-18-2013, 05:19 PM   #60050
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I have yet to see an FCR-MX off of a CRF that had an air jet in the intake bell. I read somewhere... can't remember where that many/most CRF carbs did not have air jets.
Quote:
Originally Posted by KyoXR View Post
I have the side draft and the more I read the more I believe that the jetting is different between the two.


Boojum:
As far as my jetting right now I suspect that I am robbing Peter to pay Paul but It works for me right now and I will fine tune it down the road.
I am tuning with a wide band O2 sensor.
my current setup (which confuses some but the bike runs pretty damn good):

Main Jet: 142
pilot jet: 42
Needle : NCVQ - (a rich needle) top notch. (needle bottomed)
AIR pilot: a half turn out.
AIR main: 200 (what it came with)
Stealth fuel screw- just cracked open

I would try raising the idle then lowering the idle
turn the fuel screw in all the way then try it out 3 turns
don't pump any fuel in while trying these, see If you can get it started playing around with these.

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Old 06-18-2013, 05:24 PM   #60051
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Factory Pro's
patented HDJ MAJ installation for crf / wr / yfz
Keihin FCR carbs

Where's my main air jet and what do I do with that drill bit and tap that came in my Factory Pro HDJ kit for my Keihin FCR carb?

Follow link for info re: patented


FROM: http://www.factorypro.com/prod_pages...rf250x,04.html

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Old 06-18-2013, 05:36 PM   #60052
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http://www.factorypro.com/tech/tech_...97_4gasEGA.htm
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Old 06-18-2013, 06:02 PM   #60053
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Quote:
Originally Posted by nic579 View Post
Just don't try it with the wife.

Whose wife?

Yours or mine???
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BMW's
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79 R100s
91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old 06-18-2013, 06:06 PM   #60054
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Quote:
Originally Posted by mcma111 View Post
Whose wife?

Yours or mine???

No wife here I learn the hard way.
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Old 06-18-2013, 06:54 PM   #60055
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Quote:
Originally Posted by fritzcoinc View Post
Something that should be checked is the alignment. I think it is possible that the snail adjusters on the rear axle could be way off on some bikes and Ok on others and for this reason some bikes may shake and others do not. Alignment turned out the be the reason why my Harley touring bike wobbled.
Mr. Fritz, I am not sure that I understand; could you explain this again? Are you saying that the snail adjusters--when set to the same number on both port/starboard sides--could actually cause the rear wheel to be mis-aligned?

Pardon the ignorance.
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Old 06-18-2013, 08:32 PM   #60056
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Quote:
Originally Posted by purpledrake View Post
Mr. Fritz, I am not sure that I understand; could you explain this again? Are you saying that the snail adjusters--when set to the same number on both port/starboard sides--could actually cause the rear wheel to be mis-aligned?

Pardon the ignorance.
Please call me fritz or dumb dick or something. Mr. eludes to someone who has a clue!

Yes. because the port and starboard ( left and right ) adjusters may not be the same size and the stack up of tolerances of the various components of the swing arm could also throw off the location of the pins the adjusters butt against.

Next time you have the rear wheel off place the snail adjusters together. Line up the ID's and see if the notches line up. You could also compare each adjuster using a caliper to measure the dimension from the ID to notches 5, 10, 20, and so on. Another way is to measure from the center of the swing arm pivot bolt ( axle ) to the center of the rear axle on both sides and compare/adjust ( see below ).

The adjusters are stampings and usually have a pretty loose tolerance.
Better quality adjusters are available, but you should check what you have before getting new adjusters.

What I did was to line up both adjusters ID's and Rat Tail filed the notches to match each other.


Here's checking the swing arm pivot to axle centerlines on a Husky during chain adjustment. I put a tight fitting transfer punch in the swing arm pivot and axle then measure point to point on each side and adjust to same dimension. This makes the wheel axle parallel to the engine and it's shafts but not to the front wheel and will not line up the sprockets. :



To get the chain running true, if needed, you would need to change the length of the wheel spacers to shift the wheel side to side. A laser can be used for this as well ( see below ):



Since I have not had a wobble problem that was not attributed to tires I have never checked fnt. to rear wheel alignment on my Honda or Husky. But my Harley is a different story because the engine, trans, swing arm unit is rubber mounted in the frame. This unit needs to line up with the front wheel. I use a laser on each brake rotor to do this. The engine unit is then adjusted to line up with the front wheel. This ended the high speed cornering wobble these bikes are infamous for.



Note the offset in the wheels.
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Old 06-18-2013, 08:36 PM   #60057
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Someones wife

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Old 06-18-2013, 09:03 PM   #60058
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Quote:
Originally Posted by ThumpnRed View Post
I have yet to see an FCR-MX off of a CRF that had an air jet in the intake bell. I read somewhere... can't remember where that many/most CRF carbs did not have air jets.
That sounds vaguely familiar and how some FCR-MX carbs come with a set AIR pilot jet (that can be swapped out for a different size) or can be swapped out with a adjustable one like the Side draft carbs in question have.


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Old 06-18-2013, 09:09 PM   #60059
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I need an ncvt,s, or r needle. My order in taking forever and I have a rally this weekend. Anyone hook a Mf up?
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Mention to HogWild which way the wind is blowing where you're at, wait 20 minutes, and he'll post a picture of the intersection your at and a Google Earth route of how to get there.
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Old 06-18-2013, 09:15 PM   #60060
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Main air jet's relation to main jet + needle profile could explain the differences in fuel needs between the FCR-MX and Sidedraft seeing the locked position on the MX, also the float valve may be something to look at as per keihin's specs for HP. Ie: I bet the air valve flow + float valve could both be on the restrictive side from a crf250 carb and crf450 carb possibly being close to correct.

Now what size tap is needed for the MAJ threading? And did I order the wrong jets and needle.

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