Planet Minis

vegatron75 · 12-20-2006, 09:57 AM

I was thinking about putting a hole in my intake manifold and inserting a vacuum nipple for lack of a better word so I could a read a vac guage when tuning the air fuel screw.

ANyone try this before?

The edelbrock carb on my hotrod has vacuum ports,that's the word I was looking for earlier, The carb has ports above the throttle blades and below, and theres a bung for straight manifold vac.

I use the bung on the manifold to read the vac. guage while adjusting the air screws.

Just a thought.

It pisses me off that I can tune 8 cylinders displacing 355 cubic inches, w/ no bog and good throttle response. But I can't get this 125cc single to run w/o throttle induced bog and no balls on the top end.

Peeth out, Everyone.

Merry X-mas, and a Hippy Rootbeer

Gonna Crash · 12-20-2006, 12:50 PM

I AM SOOOOO WITH YOU MAN!!! If i could figure out how to hang a holley off the manifold i would. LOL.

If it works post some pics.

JohnnyB · 12-20-2006, 04:51 PM

- I don't really think vaccum gauges can tell you much on a single cyl eng ???
- How does a gauge help you with tune'n the air mixture jet on a car ??
- Do you have a link to another thread about what your motor has in it ? Or if not please post it here .

vegatron75 · 12-20-2006, 05:16 PM

Quote:

Originally Posted by JohnnyB

- I don't really think vaccum gauges can tell you much on a single cyl eng ???
- How does a gauge help you with tune'n the air mixture jet on a car ??
- Do you have a link to another thread about what your motor has in it ? Or if not please post it here .

The vac guage will read high or low depending on the movement of the air screw(s). With the car engine I'm looking for the highest and smoothest reading from the guage.

My motor is a stock gpx w/ the crap mikuni 22mm carb.

ghostryder · 12-20-2006, 06:22 PM

My old kz900 had the fittings on each manifold. My understanding was that it was for synchronizing the four carbs. In fact I have a set of the vaccum guages but the only time I ever used them was on that bike. The bike ran great but I noticed that one of the pipes was discoloring more than the others and they were brand new pipes. I only used it to tune the one carb in line with the other three.

JohnnyB · 12-20-2006, 06:40 PM

- I have a stk 124 with a 24 shengway with stk jetting a Classics pipe , lightend oil sling , Honda electrics w/ kitaco cdi , race fuel and it run's really strong !!! If anything I could drop 1 on the main .

- Hows your valve adjustment ?

Kurlon · 12-20-2006, 08:20 PM

More handy would be an O2 sensor. I've got a Takegawa setup I've got to install on my 70, direct readout of the mixture on a portable meter. As O2 sensors go it was pretty cheap too.

turboglenn · 12-20-2006, 09:01 PM

Quote:

Originally Posted by Kurlon

More handy would be an O2 sensor. I've got a Takegawa setup I've got to install on my 70, direct readout of the mixture on a portable meter. As O2 sensors go it was pretty cheap too.

i've got a laboratory grade 5 gas analyzer... all i need for 50 tuning is a roller...right now i put em in 3rd. set the front wheel against the wall and burn the tire down while loading the bike with some weight on the seat to get a good reading that's not jsut free-revving ...works so far.... in cars and big bikes i strap it in with me and go LOL

Kurlon · 12-20-2006, 09:11 PM

Nah, no need for a roller, you just need to rig a class 1 trailer hitch for that 50. : )

turboglenn · 12-20-2006, 09:43 PM

Quote:

Originally Posted by Kurlon

Nah, no need for a roller, you just need to rig a class 1 trailer hitch for that 50. : )

hahaha.. now we're talkin unlimited amount of load possibilities :LOL

turboglenn · 12-20-2006, 11:19 PM

Quote:

Originally Posted by dragndave

if you have access to a sensitive tachometer try using the honda idle drop method.you adjust your mixture screw to where you have an rpm drop if you turn the mixture screw in or out @1/8 turn. works very well

that's only for the airscrew/idle mix and you don't need a special tool to do it just remember 2 simple rules

1.) if you rev it and let off and it hangs a little higher before it settles to idle its' too lean

2. ) rev it and let off... if it drops below the preset idle or almost dies before it picks back up to idle it's too rich

very simple procedure

2wheeltyson · 12-21-2006, 06:28 AM

back to the topic my klx110 stock manifold has a nipple on the side with a rubber cap/plug. i never knew what it was for.

12-20-2006, 09:57 AM	#1 (permalink)
vegatron75 2nd Gear Member Join Date: Jul 2006 Location: South of Kansas City Posts: 652	Vacuum gauge to help tuning? I was thinking about putting a hole in my intake manifold and inserting a vacuum nipple for lack of a better word so I could a read a vac guage when tuning the air fuel screw. ANyone try this before? The edelbrock carb on my hotrod has vacuum ports,that's the word I was looking for earlier, The carb has ports above the throttle blades and below, and theres a bung for straight manifold vac. I use the bung on the manifold to read the vac. guage while adjusting the air screws. Just a thought. It pisses me off that I can tune 8 cylinders displacing 355 cubic inches, w/ no bog and good throttle response. But I can't get this 125cc single to run w/o throttle induced bog and no balls on the top end. Peeth out, Everyone. Merry X-mas, and a Hippy Rootbeer

12-20-2006, 12:50 PM	#2 (permalink)
Gonna Crash PM Newbie Join Date: Oct 2005 Location: Las Vegas Posts: 37	I AM SOOOOO WITH YOU MAN!!! If i could figure out how to hang a holley off the manifold i would. LOL. If it works post some pics.

12-20-2006, 04:51 PM	#3 (permalink)
JohnnyB 3rd Gear Member Join Date: Nov 2003 Location: CT . aaaaaah .... heh heh heh .. Posts: 5,157 My Mood:	- I don't really think vaccum gauges can tell you much on a single cyl eng ??? - How does a gauge help you with tune'n the air mixture jet on a car ?? - Do you have a link to another thread about what your motor has in it ? Or if not please post it here .

12-20-2006, 06:22 PM	#5 (permalink)
ghostryder 2nd Gear Member Join Date: Jan 2006 Location: northern california Posts: 917	My old kz900 had the fittings on each manifold. My understanding was that it was for synchronizing the four carbs. In fact I have a set of the vaccum guages but the only time I ever used them was on that bike. The bike ran great but I noticed that one of the pipes was discoloring more than the others and they were brand new pipes. I only used it to tune the one carb in line with the other three.

12-20-2006, 06:40 PM	#6 (permalink)
JohnnyB 3rd Gear Member Join Date: Nov 2003 Location: CT . aaaaaah .... heh heh heh .. Posts: 5,157 My Mood:	- I have a stk 124 with a 24 shengway with stk jetting a Classics pipe , lightend oil sling , Honda electrics w/ kitaco cdi , race fuel and it run's really strong !!! If anything I could drop 1 on the main . - Hows your valve adjustment ?

12-20-2006, 08:20 PM	#7 (permalink)
Kurlon Super Moderator Join Date: Feb 2005 Location: Windham, ME Posts: 8,403	More handy would be an O2 sensor. I've got a Takegawa setup I've got to install on my 70, direct readout of the mixture on a portable meter. As O2 sensors go it was pretty cheap too.

12-20-2006, 09:11 PM	#9 (permalink)
Kurlon Super Moderator Join Date: Feb 2005 Location: Windham, ME Posts: 8,403	Nah, no need for a roller, you just need to rig a class 1 trailer hitch for that 50. : )

12-21-2006, 06:28 AM	#12 (permalink)
2wheeltyson 3rd Gear Member Join Date: May 2005 Location: michigan Posts: 1,655	back to the topic my klx110 stock manifold has a nipple on the side with a rubber cap/plug. i never knew what it was for.

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