Topic: Jetting Carbs Question

[lucky]

I will guess that 115's will be OK with your set up.  I would also expect a shim under the needle clip will be better, and a 1/2 to 1 turn outward on the IMS.  But, I'm no soothsayer.
Should run OK, not so sure what the fuel economy will be. And I expect some testing would help refine the setting after some feedback from plug deposits are learned.  (Or, a dyno fuel map readout.)

So I am getting a set of adjustable needles, I just ordered them. When you say shim under the needle you are talking about if I use my current needles that are non adjustable correct? If I have adjustable I can just adjust the needle to sit higher right?

Yes...You just move the clip. You do not need to locate or measure washers and guess.
You will get consistancy.

[brewsky]

Lucky + 1 here on that Slow jet!! I have a stock 78 SS factory headpipe 4-2-1 with a aftermarket slip on,,Just the decreased back pressure from that one Mod was enough to Lean out the idle circuit, Bad hesitation!! and popping on Decell, I have the stock airbox and have the 78 PD NON adjustable Needles,,,I put a shim under the clip and went from a 35 to a 38 Slow jet.....SHAZZAMMMM Smooth as glass and mid range is strong No flat spots.....SLOW JET should be the FIRST change..considering 90% of cruising is NOT the MAIN circuit,,  and i have access to a Dyno with a Sniffer around the corner seen the results and the numbers Got the Youtubes with some Dyno runs LOL..

Nice!!!.........both bikes!!
Have you dynoed the SS?
Any other motor mods besides jetting?

[livetoskate]

Lucky + 1 here on that Slow jet!! I have a stock 78 SS factory headpipe 4-2-1 with a aftermarket slip on,,Just the decreased back pressure from that one Mod was enough to Lean out the idle circuit, Bad hesitation!! and popping on Decell, I have the stock airbox and have the 78 PD NON adjustable Needles,,,I put a shim under the clip and went from a 35 to a 38 Slow jet.....SHAZZAMMMM Smooth as glass and mid range is strong No flat spots.....SLOW JET should be the FIRST change..considering 90% of cruising is NOT the MAIN circuit,,  and i have access to a Dyno with a Sniffer around the corner seen the results and the numbers Got the Youtubes with some Dyno runs LOL..

Gearhead
So your set up is probably pretty close to what I have, I am a little worried that my air box is off of a 1976 or earlier bike.
Is there a way to tell what size your slow jets are? I looked and mine have no #'s on them.

I am just saying do everthing on the bench while it is much easier to get to.
As far as float level I like the clear tube method better and I do that on the bench and put the fuel level 2 to 3 mm below bowl gasket. I think I have a photo. Look at carb #4 you can just see the fuel level. May need to click on the picture to enlarge. The test stand is easy and cheap. I c-clamp it on the bench and then store it away when not needed. The board the rack is mounted on swivels so you can get them level.

Ken

Ken
Thanks for the tip on setting my floats, I'm going to make a Stand today to set my levels this weekend

76 model did not use PD carbs.  If they are anything like the 550's the rubber couplers will be different length and size.  I don't know personally, though.

Cheers,

Twotired
Thanks, it does look like there is to little space between the engine rubbers and the air box rubbers but I haven't tried it yet.

[lucky]

Lucky + 1 here on that Slow jet!! I have a stock 78 SS factory headpipe 4-2-1 with a aftermarket slip on,,Just the decreased back pressure from that one Mod was enough to Lean out the idle circuit, Bad hesitation!! and popping on Decell, I have the stock airbox and have the 78 PD NON adjustable Needles,,,I put a shim under the clip and went from a 35 to a 38 Slow jet.....SHAZZAMMMM Smooth as glass and mid range is strong No flat spots.....SLOW JET should be the FIRST change..considering 90% of cruising is NOT the MAIN circuit,,  and i have access to a Dyno with a Sniffer around the corner seen the results and the numbers Got the Youtubes with some Dyno runs LOL..

Gearheadgreg,

That is excellent information. You have helped many people.
Could you post the dyno results?
Also tell us what size mains you are running.
What thickness was that shim??? Very important.
Was it a brass washer?

How far above sea level?
I am right at sea level practically.

Thanks for sharing Gerg!!!

[lucky]

About that float setting. It would be too high.
Check this out.
http://forums.sohc4.net/index.php?topic=101647.0

Float height .570 the easy way. 1978 floats.-LUCKY
But read the short link above.

See what I mean?

[lucky]

Also for 1978 PD carb owners there is another thread on this page that has Dyno results posted by Brewsky (forum member)
http://forums.sohc4.net/index.php?topic=105797.0

REPLY #6 on the page.

He gives the complete run down. Although he drilled 4 one inch holes in his stock air box it is very valuable information with dyno results and  A/F bike mounted meter live results.

[lucky]

http://www.hondachopper.com/garage/carb_specs/carb_specs.html

I found this but it does not mention the F models for 77 or 78

Ken

That is because the 78 model came with a plug in the mixture screw hole.
No mixture setting is given. It is given for the 1977. Which would be the same.

[Gearheadgreg]

Lucky + 1 here on that Slow jet!! I have a stock 78 SS factory headpipe 4-2-1 with a aftermarket slip on,,Just the decreased back pressure from that one Mod was enough to Lean out the idle circuit, Bad hesitation!! and popping on Decell, I have the stock airbox and have the 78 PD NON adjustable Needles,,,I put a shim under the clip and went from a 35 to a 38 Slow jet.....SHAZZAMMMM Smooth as glass and mid range is strong No flat spots.....SLOW JET should be the FIRST change..considering 90% of cruising is NOT the MAIN circuit,,  and i have access to a Dyno with a Sniffer around the corner seen the results and the numbers Got the Youtubes with some Dyno runs LOL..

Gearhead
So your set up is probably pretty close to what I have, I am a little worried that my air box is off of a 1976 or earlier bike.
Is there a way to tell what size your slow jets are? I looked and mine have no #'s on them.

I am just saying do everthing on the bench while it is much easier to get to.
As far as float level I like the clear tube method better and I do that on the bench and put the fuel level 2 to 3 mm below bowl gasket. I think I have a photo. Look at carb #4 you can just see the fuel level. May need to click on the picture to enlarge. The test stand is easy and cheap. I c-clamp it on the bench and then store it away when not needed. The board the rack is mounted on swivels so you can get them level.

Ken

Ken
Thanks for the tip on setting my floats, I'm going to make a Stand today to set my levels this weekend

76 model did not use PD carbs.  If they are anything like the 550's the rubber couplers will be different length and size.  I don't know personally, though.

Cheers,

Twotired
Thanks, it does look like there is to little space between the engine rubbers and the air box rubbers but I haven't tried it yet.

The numbers are small on the slow's,,I would just order new ones anyway just to know they are the correct size,,I always do 1 step at a time 35-38, prolly could have gone one more step up i am 2 turns out on the fuel screw.

[Gearheadgreg]

Lucky + 1 here on that Slow jet!! I have a stock 78 SS factory headpipe 4-2-1 with a aftermarket slip on,,Just the decreased back pressure from that one Mod was enough to Lean out the idle circuit, Bad hesitation!! and popping on Decell, I have the stock airbox and have the 78 PD NON adjustable Needles,,,I put a shim under the clip and went from a 35 to a 38 Slow jet.....SHAZZAMMMM Smooth as glass and mid range is strong No flat spots.....SLOW JET should be the FIRST change..considering 90% of cruising is NOT the MAIN circuit,,  and i have access to a Dyno with a Sniffer around the corner seen the results and the numbers Got the Youtubes with some Dyno runs LOL..

Nice!!!.........both bikes!!
Have you dynoed the SS?
Any other motor mods besides jetting?

The SS went on the Dyno and was surging and hesitating did not get any numbers that day, I had just got it running after a 25 years sleep, 100% Stock 16000K miles never been opened up, no leaks, Bike was sprayed with WD40 and in a nice garage from 1985, just ran the Valves, points, condenser, plug caps, Air filter,sparklers, timing, flushed the oil after 10 minutes, and jetting, naturally the acell pump was not working, check ball froze, Top end is quite on the hwy, put about 800 miles on her last summer, one 200 mile day runs beautiful, solid bike trouble free, good score $725 dollars 

[Gearheadgreg]

Lucky + 1 here on that Slow jet!! I have a stock 78 SS factory headpipe 4-2-1 with a aftermarket slip on,,Just the decreased back pressure from that one Mod was enough to Lean out the idle circuit, Bad hesitation!! and popping on Decell, I have the stock airbox and have the 78 PD NON adjustable Needles,,,I put a shim under the clip and went from a 35 to a 38 Slow jet.....SHAZZAMMMM Smooth as glass and mid range is strong No flat spots.....SLOW JET should be the FIRST change..considering 90% of cruising is NOT the MAIN circuit,,  and i have access to a Dyno with a Sniffer around the corner seen the results and the numbers Got the Youtubes with some Dyno runs LOL..

Gearheadgreg,

That is excellent information. You have helped many people.
Could you post the dyno results?
Also tell us what size mains you are running.
What thickness was that shim??? Very important.
Was it a brass washer?

How far above sea level?
I am right at sea level practically.

Thanks for sharing Gerg!!!

Stock 105 main 38 slow, Radio shack washer for needle shim i will measure it and post LOL. I live on a Island 30ft above sea level, Dyno was a flop for numbers but a wealth of info for tuning AFR was in the Red almost 16, i will get it done this summer, 33* tonight again!! ARHGGGG

[lucky]

Wow really lean with that 105 and the#38 idle jet.

I had a bad feeling about going down to the 38.
I think 40 might work. A 42 is too rich. Thats why I will go to the #40 instead.
So#42 too rich and #38 too lean (dyno)

The stock main jet is 110 I would at least stay at stock.

What do you think?

My internet has been real slow today ...frustrating.

[grcamna2]

livetoskate,
    Did you mention that you're building your own carb.stand ? that's great;it's nice to have them level when you do all those jobs,adjustments,etc. on them.
I hope you're float levels are nice and equal when your done..it'll really make you're engine run smooth and cleanly. 

[Gearheadgreg]

Wow really lean with that 105 and the#38 idle jet.

I had a bad feeling about going down to the 38.
I think 40 might work.

The stock main jet is 110 I would at least stay at stock.

What do you think?

My internet has been real slow today ...frustrating.

Ya know? i may step up to a 40 slow,,warm up takes little more time than i would like, and the 78F has a 105 main stock, on the freeway at WOT it pulls smooth but seems like it should have more punch.......but i guess i just feel sorry for the SS i am 6'2 260...me thinks it is just the pilot!! LOL  my Blown Valkyrie has 147hp on the throttle and +50 more on the bottle 128 lb's TQ

[lucky]

WOW ....I did not know the Valkyrie was so powerful!!

[Gearheadgreg]

WOW ....I did not know the Valkyrie was so powerful!!

LOL....it has a little boost from a M45 Eaton Supercharger. stock is> ,100hp  100lb TQ click the link on the bottom of my reply, Photobucket (pg 5)

[steam-powered man]

hey mr skate,
if you ever need some garage space, look me up.   

had a dt250 and still miss it.  with pirelli mt21's and +4 on the rear, that little bastid went anywhere!  would be interested in the dt250 or dt360.  am N of you in vt.
bobp 

[livetoskate]

hey mr skate,
if you ever need some garage space, look me up.   

had a dt250 and still miss it.  with pirelli mt21's and +4 on the rear, that little bastid went anywhere!  would be interested in the dt250 or dt360.  am N of you in vt.
bobp 

I'll let you know, I just sold the dt250 to a friend of mine and the bike is actually now in Southern,Vt . I am from Vt as well, I am pretty tied to my Dt360 but have thought about letting it go now and then. The dt 360 has been bullet proof and super reliable as my get around the city bike. Only gets to see the woods a couple times a year.

[livetoskate]

So realized the only air box I have out of THREE are all older model air boxes

I am debating wether I should try and find a 1977-78 air box or try and make my older ones fit...

Well I am out of town for 5 days so maybe I'll put a post up on the wanted section seeing if anyone on the forums happens to have one, or if
any of you might have one your willing to sell please let me know.

I am getting everything I need otherwise filter,slow jets,....

Thanks

[steam-powered man]

thx for the reply, and good luck w/your ride!

[lucky]

Wow really lean with that 105 and the#38 idle jet.

I had a bad feeling about going down to the 38.
I think 40 might work.

The stock main jet is 110 I would at least stay at stock.

What do you think?

My internet has been real slow today ...frustrating.

Ya know? i may step up to a 40 slow,,warm up takes little more time than i would like, and the 78F has a 105 main stock, on the freeway at WOT it pulls smooth but seems like it should have more punch.......but i guess i just feel sorry for the SS i am 6'2 260...me thinks it is just the pilot!! LOL  my Blown Valkyrie has 147hp on the throttle and +50 more on the bottle 128 lb's TQ

GEARHEADGREG....Did you install those #40's yet??
What was the result?  Thanks-LUCKY

[livetoskate]

Got just about everything I need but the guy I bought the adjustable needles from said he can't find them...!
Anyone know where I might be able to find a set or happen to have a set they'd pat with?
Thanks

[lucky]

Got just about everything I need but the guy I bought the adjustable needles from said he can't find them...!
Anyone know where I might be able to find a set or happen to have a set they'd pat with?
Thanks

Bike Bandit .com $18.00 +shipping.-LUCKY

[livetoskate]

Got just about everything I need but the guy I bought the adjustable needles from said he can't find them...!
Anyone know where I might be able to find a set or happen to have a set they'd pat with?
Thanks

Bike Bandit .com $18.00 +shipping.-LUCKY

Yeah I saw that but $73 + shipping for a set of 4 needles is a bit more than I was hoping to spend. Maybe I'll keep a lookout for a set of used ones in good condition.
Thanks though

[lucky]

Got just about everything I need but the guy I bought the adjustable needles from said he can't find them...!
Anyone know where I might be able to find a set or happen to have a set they'd pat with?
Thanks

Bike Bandit .com $18.00 +shipping.-LUCKY

Yeah I saw that but $73 + shipping for a set of 4 needles is a bit more than I was hoping to spend. Maybe I'll keep a lookout for a set of used ones in good condition.
Thanks though

I think it said $18 for the SET. Not $18 each!!!

Check again. Call.

If it is true- then call Sirius Consolidated. I know their prices are reasonable.

[livetoskate]

Got just about everything I need but the guy I bought the adjustable needles from said he can't find them...!
Anyone know where I might be able to find a set or happen to have a set they'd pat with?
Thanks

Bike Bandit .com $18.00 +shipping.-LUCKY

Yeah I saw that but $73 + shipping for a set of 4 needles is a bit more than I was hoping to spend. Maybe I'll keep a lookout for a set of used ones in good condition.
Thanks though

I think it said $18 for the SET. Not $18 each!!!

Check again. Call.

If it is true- then call Sirius Consolidated. I know their prices are reasonable.

Lucky
By "set" they mean one needle and one adjustment clip, I called to double check.
I will give Sirius a call tomorrow, thanks