can I put a document in as a picture?

[tony.mon]

[quote]CV Carb Tuning High RPM engines
L Top end (full throttle / 7.5k to redline ) Select Best Main Jet
Best Main Jet must be selected before starting step 2 (needle height)!
To get the best, most even top end power (full throttle/after 7500 rpm), select the main jet that produces the highest top speed / pulls hardest at high rpm. If the bike pulls harder at high rpm when cold and less hard when fully warmed up, the main jet is too large. Install a smaller main jet and retest until you find the main jet that pulls the hardest at high rpm when fully warmed up If the bike doesn't pull well at high rpm when cold and gets only slightly better when fully warmed up, the main jet is too small..
This must be done first - before moving on to the other tuning ranges. In order to properly tune the midrange and low rpm carburetion, THE MAIN JET MUST FIRST BE PROPERLY SELECTED after 10 to 15 minutes of hard use!
Do not pay too much attention to the low-end richness when you are changing main jets - you still need to be using the main jets that produce the best power at high rpm. You will deal with the low-end / cruise later - after step 2.
-2~Midrange (full throttle/5k-7Q
Step I (Best Main Jet) must be selected before starting step 2!

Select best needle clip position
To get the best power at full throttle / 5k-7k rpm, adjust the needle height, after you have already selected the best main jet.
If the engine pulls better or is smoother at full throttle/5k-7k in a full throttle roll-on starting at <3k when cool but soft and/or rough when at full operating temperature, it is too rich in the midrange and the needle should be lowered. If the engine pulls better when fully wanned up but still not great between 5k-7k, try raising the needle to richen 5k-7k.
If the engine pulls equally well between 5k-7k when cooler as compared to fully wanned up, the needle height is probably properly set.
Do not pay too much attention to the low-end richness when you are changing needle clip positions - you still need to be using the clip position that produces the best full throttle / 5k-7k power in conjunction with the main jets (Step 1) that produce the best power at high rpm. You will deal with the low-end / cruise next.




3. Low end (full throttle / 2k-3k)
Step 1 (Best Main Jet) and Step 2 (needle height) must be selected before starting step 3!
Float height
To get best low-end power, set float height (fuel level) so that the engine will accept full throttle, without missing or stumbling, in 2nd gear from 2.5k to 3k rpm at minimum.
Float heights, unless otherwise specified in the installation guide, are measured from the "gasket surface" of the carb body to the highest part of the top of the float - with the float tang touching but not compressing the float valve spring.
If the engine has a "wet" rhythmic, soggy area at full throttle / 3k-4k rpm, that gets worse as the engine heats up, lower the fuel level by resetting the float height 1mm greater (if the original was 13mm - go to 14mm). This will lower the fuel level, making full throttle / 2k-3k rpm leaner. If the engine is "dry" and flat between 2k to 3k rpm, raise the fuel level.

Example: change float height from 15mm to 14mm to richen up that area. REMEMBER, since the main jet WILL affect low speed operation, the MAIN JET has to be within 1 or 2 sizes of correct before final float setting.
Warning: If the engine is left with the fuel level too high,, the engine may foul plugs on the street and will be "soft" and boggy at part throttle operation. Adjust Floats to raise/ lower the Fuel Level.
Base settings are usually given if a particular application has a history of critical fuel level. The Fuel level height in the float bowl affects full throttle/low rpm and, also, richness or leanness at cruise/low rpm.
Reference: a bike that runs cleanly at small throttle openings when cold, but starts to show signs of richness as it heats up to full operating temperature, will usually be leaned out enough to be correct if the fuel level is LOWERED 1mm. Check out and RESET all: Suzuki (all), Yamaha (all) and Kawasaki (if low speed problems occur). Needless to say, FUEL LEVEL IS EXTREMELY IMPORTANT!!!
If there are low-end richness problems, even after lowering the fuel level much more than 1.5mm from our initial-settings^ check for needle wear and needle jet (part of the emulsion tube It is VERY common for the brass needle jets (in the top of the "emulsion tube") in 36mm, 38mm and 40mm Mikuni CV carbs to wear out in as little as 5,000 miles. Check them for "oblong" wear - the needle jet orifice starts out round! Factory Pro produces stock replacement needle jets / emulsion tubes for 36mm and 38mm Mikuni carbs.
4. Idle and low rpm cruise
Fuel Screw setting (AKA mixture screws)
There is usually a machined brass or aluminum cap over the fuel screws on all but newer Honda. It's about the diameter of a pencil. Newer Honda carbs have no caps, but use a special "D" shaped driver, usually supplied in the carb recal kit. We do have them available separately, too. 800 869-0497 to order -
Set for smoothest idle and 2nd gear, 4k rpm, steady state cruise operation. Set mixture screws at recommended settings, as a starting point. For smoothest idle, 2nd gear 4000 rpm steady state cruise, and 1/8 throttle high rpm operation. Pilot fuel mixture screw settings, float level (but, you've already "fixed" the fuel level in Step 3!) AND pilot jet size are the primary sources of mixture delivery during 4000 rpm steady state cruise operation.



If lean surging is encountered, richen mixture screws (turn out) in 1/2 turn increments. Alternative pilot jets are supplied when normally required.
Pilot fuel mixture screw settings, float level and pilot jet size also affect high-rpm, 0 to 1/8 throttle maneuvers. Too lean, will cause surging problems when the engine is operated at high rpm at small throttle openings! Opening the mixture screws and/or increasing pilot jet size will usually cure the problem.
NOTE: A rich problem gets worse as the engine heats up. If the throttle is lightly "blipped" at idle, and the rpm drops below the set idle speed, then rises up to the set idle speed, the low speed mixture screws are probably set too rich: try 1/2 turn in, to lean the idle mixture.
NOTE: A lean problem gets better as the engine heats up. If the throttle is lightly "blipped" at idle, and the rpm "hangs up" before dropping to the set idle speed, and there are no intake leaks and the idle speed is set at less than 1000 rpm, the mixture screws are probably too lean: try 1/2 turn out, to richen mixture. Be sure there are no intake leaks and the idle speed is set at less than 1000 rpm!
Carb Kit Design is a combination of science, art, intuition and and at times, a fair dose of wizardry. There is no dyno that "tells" one how to assemble or modify the carb to deliver proper power and response.
Perfect Carb Kit TUNING requires patience and perseverance and "reasonable" feel to feel the changes - of which - most motorcycle riders have a good ability to do.
When a dyno "operator" says he/she has to ride the bike after dyno tuning to do the final tune for cruise smoothness - that's what they are doing. Avoid any dyno operator who says that they don't have to do that!!!
The only dyno that I know of that will duplicate and visually display the engine smoothness is the EC997 dyno (yes, 1 know, we make it) -that's one reason why, if you can, you'd like to use one for tuning - a smoother engine IS getting the best mixture. Other dynos claim to "tune to an "A/F Ratio" - probably the biggest marketing scheme in the dyno industry at this time - and they never can equal the quality of tune as designed -These tuning kits have been thoroughly tested to ensure easy, trouble-free, optimized performance.
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This info is supplied with Factory Pro jet kits, which can be bought in the UK from Straightline Racing-

Straightline Racing 102-103 London Road King's Lynn Norfolk PE30 5ES
Telephone: 01553 772774.
Fax: 01553 765176
e-mail: sales@straightlineracing.co.uk.
http://www.straightlineracing.co.uk

They also sell the ignition advancer which helps as well.- less than £50!
/quote]

[Pete.L]

A good read Tony
I read this the other day when you posted the link to the Factory pro site. Wish I had found this when I was first doing mine, this looks loads better than the Dyno jet instructions.

Pete.l

[tony.mon]

I was just testing here- I've put an edited version, with spacing and headings in the Workshop Knowledgebase section.

Don't know if I'd have the patience to set carbs up this way- looks straightforward but would mean many "tank off, airbox off, carbs off, adjust, and then put them all back again" sessions.

Dyno's easier, for sure

[tony.mon]

[url]https://vstuff.virginmedia.com/n/50-17/ ... 027f8//url]
[*https://vstuff.virginmedia.com/n/50-17/ ... fa2c027f8/[*]


Well, it doesn't work in a preview, let's see if it works when posted.
(EDIT: No, it bloody doesn't.)

This is getting irritating.

What am I doing wrong here?

[cupasoop]

What is it your trying to do Tony?

[tony.mon]

Got it. Whenever I tried to right-click between the square brackets I was selecting a bracket, which was then overwritten by the pasted info.
What's the keyboard shortcut for "paste"- not ctrl+P, apparently, that's print.

Thanks for your assistance.

I can finally post a piccy or two- about time, methinks!

[tony.mon]

Nope, i see a Red Cross saying accessing the media is not permitted.

That's Iran, isn't it? The Red Cross and the Media aren't permitted?

[cupasoop]

ctrl-v for past.

Tony, just get a photobucket account for your pictures instead of that virgin media java loaded crap.

It's a whole lot easier.