What did you do to your bike today?

[jvb_ca]

Re-jetted/cleaned/tuned carbs yesterday.
After mounting the Supertrapp, finally got around to re-jetting the FJ. I did not go with a kit, but decided to replace mains and pilots.
Going with Chris's (FJ1289) suggestions here is what I did.

Old setup
F1s slipons, stock headers and collector.
UniPod air filters.
main jet 112.5,
pilot jet 40,
needle 5FZ274
air 155,
needle clip position 3.
Idle screw 2.5 tuns out.
Float height 22mm
Ran great. A little rich on the low end. Plugs and pipes sooty black. Maybe float height was to high? Mileage was acceptable.

New setup
Supertrap full stainless 4-1 pipe
UniPod filters
Main jets 117.5
Pilots 42.5
Needle 5Fz272 (stock)
Air 155 (stock)
Needle clip pos. 3 (middle)
Air screw 2.5 turns out.
Float height 21mm (lowered 1mm)

Blip test was hanging slightly, so I turned air screw out to 2.5 turns.(started at 2) Comes right back to idle. Re-Synced carbs.
After 1st test run :
Ran great. Low end and middle throttle response muchly improved. Driveabilty(is that a word?) is excellent. No hesitation from low rpm right through to redline. Pulled hard and steady.  Maybe a little flat at top? (bigger mains? 120) is ok for now. Will ride a bit and tweak from here if need be. Check plugs after a ride or two. I think it is real close right now. Will have to check mileage.
Rode two up with my wife last night, and same results. Very happy so far...

And I love the tune this pipe plays...music to the ears.  , and a total weight savings of just over 9lbs from old setup.



Thanks Chris for suggestions. Probably saved a lot of dinkin around...

Cheers...Jake

[fj1289]

Jake,

Glad you like it and you're in the ballpark with the jetting!

To see if you need bigger mains - take a quick ride with the air filters off.  See how it does on top.  If better, you need to go leaner on the mains (try 115's or even your 112.5's), if worse, then you need to go richer (try 20's).  I'm going to guess it'll probably need to go richer based on Andy's experience with the V&H.  Note - your mid range may not like it, but it's just a quick test to see which way to go on the mains without having to spend as much $$ or time!  Then again, if the mid range improves too, try lowering the needle a half slot (clip in #2 with the thin spacer washer under the clip). [I'm assuming you've got little spacer washers - you may not]

Also, if you go richer (or leaner) on the mains, you may have to make a small step in the opposite direction for the midrange to compensate for the effects (may not be noticable with just a once size main jet change though).

Kookaloo!

[SkyFive]

This is what I've done in the last week or ten days.

Prep, polish and paint wheels, two full  days work each, the masking is very tedious. My intention is to try and stay as close to original as possible but, I took some liberties and painted them black metallic.  Remounted front tire, replaced 3" long truck valve stem with short chrome stem, replaced bearings/seals and installed Dyna Beads. Rear wheel is now painted and being reassembled.

Refinish cushdrive and install new sporcket. (I did remove paint from sprocket lands before installing sprocket)


Disassemble forks, clean, refinish lower forks. replace seals and fluid. Strip and polish lower triple tree and repaint upper triple tree. Clean and repack stem bearings with grease.


Clean, polish, refinsh and grease rear suspension components. Install new 530 o-ring chain.


The engine is ready to install after wheels are on.

[racerman_27410]

This is what I've done in the last week or ten days.

The engine is ready to install after wheels are on.

everything looking new again .. very nice!   

KOokaloo!

[carsick]

Oh. Wow. I think I'm in the wrong classroom. I just use brake cleaner to scrape the melted tire off my tailight. You gonna ride that thing or put it in a ziploc bag?
Okay, enough funnin'. Very, very nice work and photos! I am eagerly awaiting your next post!
Doug

[SkyFive]

Oh. Wow. I think I'm in the wrong classroom. I just use brake cleaner to scrape the melted tire off my tailight. You gonna ride that thing or put it in a ziploc bag?
Okay, enough funnin'. Very, very nice work and photos! I am eagerly awaiting your next post!
Doug

Thanks Doug! Some of those parts came from you. I appreciate your help, I really do!

[carsick]

The parts were so purty I never woulda recognized 'em. Perhaps because they used to look like-
THIS!!

[weymouth399]

Thats a hell of away for you to store my engine 

[carsick]

Whaddya mean? It was running in that picture! Sure is loud without pipes...

[weymouth399]

No pipes, No diaphrams, No cables, no problem.
Don't let water get in in her, then she's worth nothing.

[Shaun]

I see the pipes through the window of the mustang, bet they are dry...

[carsick]

I pulled the motor before monsoon season here and put it under cover.

[Pat Conlon]

   Hey Jake,
I hope you don't mind but I added your above post with your jetting information, over to our files section.

In that Files section there is a subsection (or child board) called "Carburetor Files". Within there is a post called "Recommended Jetting for Stock Carbs and Mild Mods"..

That's where I will add your info.

That way we can archive all our carb jet tuning experiences in one section for ease of future review.

Thanks Jake for sharing your jet tuning info. with us. We all learn from each other.  

***Hey other FJ'ers.... If you have found a set of jets which work well for you, please head on over to the topic in above Files section and share your info with the rest of us.  We need to populate this topic with our knowledge***

Remember the Files section is not for discussion purposes, if you have a question on what's in the files, post the question in the appropriate general section (e.g. Modifications, etc) so we will all see it and thus, be able to give you a quick answer.

Carry on amigos, thanks again Jake. That's some good shit.

Re-jetted/cleaned/tuned carbs yesterday.
After mounting the Supertrapp, finally got around to re-jetting the FJ. I did not go with a kit, but decided to replace mains and pilots.
Going with Chris's (FJ1289) suggestions here is what I did.

Old setup
F1s slipons, stock headers and collector.
UniPod air filters.
main jet 112.5,
pilot jet 40,
needle 5FZ274
air 155,
needle clip position 3.
Idle screw 2.5 tuns out.
Float height 22mm
Ran great. A little rich on the low end. Plugs and pipes sooty black. Maybe float height was to high? Mileage was acceptable.

New setup
Supertrap full stainless 4-1 pipe
UniPod filters
Main jets 117.5
Pilots 42.5
Needle 5Fz272 (stock)
Air 155 (stock)
Needle clip pos. 3 (middle)
Air screw 2.5 turns out.
Float height 21mm (lowered 1mm)

Blip test was hanging slightly, so I turned air screw out to 2.5 turns.(started at 2) Comes right back to idle. Re-Synced carbs.
After 1st test run :
Ran great. Low end and middle throttle response muchly improved. Driveabilty(is that a word?) is excellent. No hesitation from low rpm right through to redline. Pulled hard and steady.  Maybe a little flat at top? (bigger mains? 120) is ok for now. Will ride a bit and tweak from here if need be. Check plugs after a ride or two. I think it is real close right now. Will have to check mileage.
Rode two up with my wife last night, and same results. Very happy so far...

And I love the tune this pipe plays...music to the ears.  , and a total weight savings of just over 9lbs from old setup.



Thanks Chris for suggestions. Probably saved a lot of dinkin around...

Cheers...Jake

[SkyFive]

I installed the engine, starter and alternator. Mounted a new rear tire and installed the rear wheel. I got the clip on's repainted and the master cylinders rebuilt and repainted. I'm working on the calipers now, I had to order all new seals for those. I'm waiting on some wiring harness tape, the kind without andhesive, then I will rewrap the harness. I'm getting close to finishing. The only hurdle that I can foresee is the exhaust, I have a nice original system that I want to install but the problem with that is two of the down pipes have holes in the inner pipes. If anybody has two 1984 or 1985 fat style down pipes they want to part with I would be interested. I have a Vance & Hines system that I may use as a last resort but I really want to stay as close to original as possible.





I found this guy saying a prayer on my garage door, I hope it was for me.

[Mark Olson]

that is looking good, almost makes me want to wash my fj........almost