AIR fuel mixture screws

i recently bought a 1982 Yamaha maxim 650, wouldn't start so i got it for $300.

anyway, i've taken the carbs fully apart and i will be putting them in the carb cleaner dip, but when i took out the air fuel mixture screws, i turned them in to check how many twists out they were and this is what i found
carb #1: 1/4 turn to bottom out
carb #2: 1/8th turn to bottom out
carb #3: 2 turns to bottom out
carb #4: 2.5 turn to bottom out

is this normal? when i put them back in you think i should put them back the way they were our set them all the same at 1.5-2.5 turns?

and yes, i am very sure that the screws where bottomed, and turns counted correctly.

 

Normally, 2.5 to 3 turns is a good starting point. I can't believe that 1 and 2 were firing at all being set so lean. What did the plugs look like?

 

i haven't been able to pull the plugs yet, i only had up to 3/4's" deep, and this guy needs a 13/16ths socket, so i have that on order, but ya, the brass tamper proof plugs where still there when i opened the carbs, so i would assume it was running like that up till now in its life.

 

It's not unusual for them to be in that far on virgin carbs. Probably best to put them back there when you reassemble, you know that is a setting that worked at one time.

Don't soak the carbs in cleaner unless you plan to replace the butterfly shaft seals. I prefer to clean with a spray can and compressed air.

 

Dipping them in chem-dip will eventually destroy the rubber o-rings inside the carbs......o-rings being in the pilot mixture screw, the throttle shaft seals and the fuel o-rings......

If you are cleaning the carbs....go all the way and break the rack and replace throttle shaft seals & the fuel o-rings, & the pilot mixture o-rings....

Do it right the first time......& only time......taking them back off the bike is a PITA.....

Just cleaning with carb cleaner is only half the battle.......

Make sure starter enrichment jet passages are clean as well for easy choke starting.

 

That you had the Plugs in-place and Virgin Air Screws that came right-out is a BIG plus for you when it comes time to do YOUR OWN fine-tuning.

When you arrive at the point where you will have to set the Air Screws when you begin your tuning, ... a ColorTune Plug will help determine where to reset them.

Don't dive-into the Carbs without the right JIS Screwdrivers that fit the Fasteners and Jets precisely.

When the Bowls are OFF, ... take every precaution not to damage a Float Pillar Post.

http://www.berrymanproducts.com/product ... s-cleaner/

 

thats what i was thinking, except, i have never seen the bike run properly, and for all i know, the carbs came off ebay, and were added as a last attempt to get the bike to run, so i'm torn between.

 

yes yes, i took the carbs apart properly, nothing but metal going in the carb dip, you really can't beat carb dip in my opinion, plus it forces you to do a full tear down and replace the parts that are worn out.

idk, i always do a full tear apart when i clean carbs on bikes, i just feel like otherwise you could have a bad throttle shaft seal, or something and never know until you can't sync them

 

i have more then enough screw drivers, i got everything apart with only penetrating oil and work, that is the carb dip i am useing.

the pin that connects the floats to the float pillars was a dream compaired to mikuni carbs, i have mainly work with mikuni, not as much experience with these ones

 

don't have a yics eliminator tool yet though, have to buy one from charol

 

Are they JIS screwdrivers though? Yes, you can get away with using Phillips drivers...usually......then there comes along that one time when you can't. Spending $20 now will save you much time and frustration later on, even if it's years later on.

Glad to hear the carbs came apart easily.

 

Good Carbs become Parts Carbs real fast using the wrong screwdrivers.

 

i had to look up exactly what jis screw drivers are, and im guessing that no, none of mine are JIS screw drivers.

THats good to know, i'll have to pick up a set.