Question about Motorcycles
I cleaned the carbs on my bike but did not pay attention when I took out the pilot jet adjustment screws. Now I don't know for how many turns to turn open the adjustment screws. I tried many possibilities between 1.5 and all the way to 5 turns but is either to rich or to lean. In any case it starts a couple of times than it doesn't and I have to start all over again cleaning the spark plugs and draining the floater bowls. It's either too dry or it's flooding. Somebody please tell me what I do wrong and how to do it right. Thank you!
Carb work is for the pros. This may or may not be your trouble. Before you damage your very expensive carbs, take your bike to the pros. They have the special tools and expertise to set your carbs for maximum efficiency, safety and performance.
Posted on Nov 30, 2012
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Posted on Jan 02, 2017
i'd say the carb is gummed up especially the pilot jet (#16158) in this pic of the USA carb. may have to remove the carb & bowl and then remove the pilot jet (w/ flat head screw driver) and clean out the tiny holes.
the carb slide is installed backwards (turned 180 degrees). its #16025 in the pic. i've done this before on my daughter's XR70 and Z50. you'll know if its this when you move the choke lever, RPMs increase and decrease.
hope this worked for you and was fast enough.
Posted on Feb 06, 2009
SOURCE: Cleaning Carb Jets
not to a trained ear also go by rpm and spark plug color
NOTE: use copper wire to clean jets, sync is just thottles are same position as all carb's just leave them adjustments alone will be fine if are out use a 1/8 drill an place in between piston/butterfly to carb bore to sync/calibrate
better use a manometer for adjusting screws
depends on condition of org parts
worn = richer running
new = lean an clean
also if changed the exhaust system need to
re-calibrate carbs for max performance
Posted on May 09, 2009
SOURCE: Bought a 2000 yamaha yzf600r
You can fail emissions on a bike in arizona ? Wow i thought california was bad....anyhoo let's get to your concerns....All those srews should be very close to the same setting....rule of thumb is start at 1and1/2 turns out on each screw, almost any gasoline engine will run at these setting then you can fine tune from there.....no wonder you had bad idling problems...Good luck to you friend....Tim
Posted on May 12, 2009
hi,fairly common problem with modified exhaust,start with the pilot screws,turn right in untill the screws are firm then back out 1 and 3/4 turns,this is a fairly standard rule of thumb that will get most things going,as far as the jets go,the original size would be a good starting point,but you should only need to go up 10-15 sizes to compensate for the exhaust mods(ie stock might be 127 may need to go to138 or 140 etc),the other thing that i would recommend is getting hold of a set of damped carb balancers these will enable you to get the mixtures and carb balance dead right,they are relitively cheap and easy to use and will have paid for themselves the first time you use them.(i regularly get 4-8 sometimes 10-11 extra hp over stock by tuning the carbs up properly).hope this helps
Posted on Jul 06, 2009
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