Topic: Removing Press-in Pilot Jets

[Zeke]

My bike has pressed-in slow jets.  It's an 80 650.

I have ordered mains and pilots from www.motorcyclecarbs.com.  I talked to him on the phone and he suggested that I could remove the old jets using an "easy out".

Now, I've seen and used screw extractors before but:

1)  They seem to be for threaded fasteners, not for pulling something pressed-in
2)  I've never seen a set with one small enough to fit my pilot jet.

How do you all remove these pressed in jets?

Thanks,

Zeke

[Lumbee]

77/78 750's have the pressed in slow jets, in which I  remove all the time.  I just use a set of pliers, and I've never had a problem.  You must get a VERY good grip and then slowly rotate as you slightly pull on the jet.

[eldar]

Pull and twist but you will need to tap the carbs to accept the new lows. This has been done but can be very difficult depending on the size of the new slows. You may not even be able to do it with the lows you currently have.

[TwoTired]

I'm not familiar with the carbs on that bike.  Can you post a picture of the slows you have now?

I would expect an easy out to destroy the jets you have now.  It would provide twist, but very little pull.

Cheers,

[Zeke]

Yeah, I figured it would destroy them, but that's what the "expert" said to do.

I've been told that there isn't a tight press fit so I was thinking to try my little Vise Grips.

I don't have a pic, but I'll take one in a few weeks when I pull them out again.  Still waiting for parts.

He also told me that the pilot jets he's sending are threaded -- and so close to the untapped diameter of the pilot "seat" that you can just put a little blue loctite on the new jets threads and drive them home -- let dry, and you're done.

I don't know, except for this cat at motorcyclecarbs.com says he rebuilds these same carbs for people all the time just like this.

Zeke

[dafrpa]

I've seen it posted that they will tap themselves on a 77/78 750 carb, likely will on the 650 too. I recommend more pull, less twist. They go back in with a very light tap of the hammer.

[Lumbee]

He also told me that the pilot jets he's sending are threaded -- and so close to the untapped diameter of the pilot "seat" that you can just put a little blue loctite on the new jets threads and drive them home -- let dry, and you're done.

...sounds pretty permanent to me...what if you want to try a different jet?  Why are you removing these any way, for cleaning, or for a diff. jet size?

[eldar]

Well if he taps, it is no big deal as long as he can get the correct threads and size again, but then that is the challenge isnt it.

[Zeke]

hey all:

I'm not trying to clean the pilots -- they are fine.

But, my stock pipes are toast, so this winter I picked up a set of Hooker 4-1 "race" pipes that I found NOS for about 200 bones.

So, most everything I've read says that the mains will have to go up a few notches.  On the motorcyclecarbs.com site, there is a tuning guide which is not for Honda SOHC but for I think Yamaha Inline 4s.

So, by its logic:

2 main jet sizes for 4-1 pipes
2 main jet sizes for pods (I decided to go for this to make the carbs in/out easier)

Subract 1 for every 3 main sizes:  My total is 3 main jet sizes.

For every 3 main sizes, the pilot should go up one size.

So my main was 95:  98,100,102 -- should be the new size.

Anyway, it's just a starting point -- I bought 3 mains 100,102,105.

I can try without the new pilots but the guy Robert at the website said he'd bet I'll need to increase the pilot, which is why I'm asking how to remove it.

What do you guys thing of all this nonsense?

Zeke

[TwoTired]

Some thoughts:

Rules of thumb are great for thumbs.  Some exhausts flow freer than others, some pods flow better than others.  Not only is there variablility between vendors, there is variability within vendors, product sample to product sample.  They save money on quality control this way. 

Seems odd (or suspicious) that the jet salesmen would have rules for replacing jets, yet ignore completely any dealing with the throttle valve needles, size, taper, or clip position, which dominates mixtures from 1/4 to 3/4 throttle. 
Could it be, they don't sell needles, and therefore omit them from replacement rules?   

Cheers,

[oldfart]

I realize this makes me a veritable heretic in today's nonsensical culture, but very few aftermarket exhausts do anything that would make the engine need more fuel.  That is one of the most stupid, knee-jerk myths in the powersports industry.  The few exhausts that do make a difference can be counted on one hand, and these were never produced for the SOHC.  Stock mains will work fine.  That is however only in reference to exhausts.  For air filters, that's a whole different ballgame.  K&N filters, especially pods, will make huge differences in airflow, requiring commensurate changes in fuel supply.  :-)

[Zeke]

Ol' Fart:

Whether you're right or this guy is right I plan to let my plugs do the talking.

If at least that part of carb tuning is correct, I should be able to get a sense if my bike is running too lean or not.

Since I ride my bike to work daily I wanted to have all the parts needed before I start.  That way, I can probably get it going in one weekend.

I have heard alot of people say that you have to increase jet sizes for a 4-1 -- maybe that's because they are all doing pods as well:  who knows?  We'll see.

What do the rest of you think?

Zeke

[mick750F]

Ol' Fart:


What do the rest of you think?

Zeke

   What I think is that you'd be far better off listening to the likes of Lloyd and Mike than you would some jackass that suggests you remove your jets with easy outs.

    And this is priceless..."He also told me that the pilot jets he's sending are threaded -- and so close to the untapped diameter of the pilot "seat" that you can just put a little blue loctite on the new jets threads and drive them home -- let dry, and you're done."  What will you do if you want to change the jets again? Surely after you've mangled them in there they won't be easy to get out. Perhaps the next set can go in with bubble gum...or bondo? Yeah, maybe I'm being a little sarcastic but think about what this salesman is suggesting you do. Lloyd(TwoTired) is VERY knowledgeable about these bikes as is Mike(oldfart). I don't know if Mike's site is still up and running...if it is you should check it out. How 'bout it Mike? Is the Wrenchbender site still up and running?

Mike

[Bob Wessner]

IIs this it??

http://www.motorcycleproject.com/index.html

[mick750F]

IIs this it??

http://www.motorcycleproject.com/index.html

   That's it Bob! Thanks! I have it bookmarked elsewhere and couldn't remember the addy.

Mike

[bowhunter]

I don't know about you other gentleman, but I've had my press-in jets out several times, and never had a problem having them stay in after cleaning. Thay's been my experience anyway. Take them out, clean them, and tap them back in gently. Never had one come loose.

Bowhunter