'84 FJ1100 resto mod

[mtc]

Thanks guys!

mtc, is that FJ on the link you posted is your's? It is very nice!

no not at all, i ought to start customizing mine a little ( 1985 bone stock with some upgrades), i am too worried about the resale value that does not exists

and besides, my skills fabrication, mechanical, and shop is just too basic, a man's got to know his limitations, and that would be me.

looks great with no side covers huh?



i saw it online, never seen anything like it, it is very unique, and you are making it happen all over again, even better because it's the velocity channel

[stou]

Today I started the FJ. It run but need some tuning. The carburetors are leaking, I will probably need new carburetors rebuild kit or at least the float neddle kit. They was really bad.

I have a question about vaccum connections. When I look at the part diagram, there's plugs on intake of #1, 3 and 4 and the #2 is connected to the ignition box.


But on the intake #1 of the bike, there was a tube from intake to the fuel tank petcock. Is it ok for a test with an auxiliary tank to put a plug on this intake vaccum connector?

[Pat Conlon]

But on the intake #1 of the bike, there was a tube from intake to the fuel tank petcock. Is it ok for a test with an auxiliary tank to put a plug on this intake vaccum connector?

Yes, plug the #1 vacuum port when using an auxiliary tank. Never leave a vacuum port open....never.

With the #1 vacuum line disconnected at the manifold and still connected to the petcock, do a suck test on this vacuum line to be sure that the petcock diaphragm does not leak. If you draw air thru this vacuum line when it's connected to the petcock, replace or rebuild the petcock.

Do the same suck test on the #2 vacuum line to your ignition box, disconnect the line from the manifold port and then suck on the line. You should NOT be able to draw air thru this line. If you do, that means that the vacuum diaphragm in the ignition box is knackered and leaking air. This vacuum leak condition is bad for your fuel/air mixture in your #2 cylinder.
Plug this vacuum line off at the manifold permanently.
Don't worry about any performance changes by plugging this ignition box vacuum line. The ignition vacuum advance is for emission requirements not performance.

http://www.fjowners.com/index.php?topic=11690.0


Cheers
Pat

[stou]

Thanks for the explanation Pat! I checked the #2 line to the ignition box and it look good. I can't suck air from the box. For the one to the petcock, I'll check later. I need to clean it before.   

Before ordering carb kits, I'll check all the float needles to see if the are leaking and also the float level. Those carb kit are not cheap and I want to be sure I really need it before buying them. It's a pain in the ass to work on the carburetors on this bike. With the airbox, you need to remove the subframe in order to remove the box and then the carburetors 

I need some parts from RPM and before ordering them,  I try to look at everything I need to make the bike running good. Question of saving on shipping fee!

[Pat Conlon]

Hands down the best $24 you will ever spend on your FJ....
http://rpmracingca.com/proddetail.asp?prod=carbkit
This kit has the float needle seat O rings that are very commonly the source of leaks.

Also consider getting some new #40 pilot jets, 117.5 mains and (4) shims for your needles, then (2) UniPods, filter spray,  and a filter for your crankcase breather hose.

Never again will you have to dick around with that oem air box.

You can thank me later....(and you will)

Cheers

[stou]

That is really interesting! That air box is so anoying!

I'll wrote that on my parts list!

[stou]

I forgot to give a feedback about the sight glass. Finally I bought those on amazon, they was really cheap and was looking better than the one of New River Cycle Salvage

https://www.amazon.ca/-/fr/gp/product/B01GR5HWPC/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

It doesn't work like the original sight glass. The one on the FJ have a groove for the o'ring and are only installed press fit. It doesn't work with the on I bought. But I used the procedure from this video bellow and used oil resistant black gasket maker silicone. I poured oil in the master and still looking good after 3 days. There's no trace of oil around the glass.





https://www.youtube.com/watch?v=F_yo3FnH6DM

[Pat Conlon]

Thanks for the update on the sight glass replacement.....when you said you filled your master up with oil, I assume you meant DOT 3 or 4 brake fluid.

[stou]

Yes, Dot 3 brake fluid!

[stou]

Also consider getting some new #40 pilot jets, 117.5 mains and (4) shims for your needles, then (2) UniPods, filter spray,  and a filter for your crankcase breather hose.

Pat, I looked in both carburetors set I have and both have #40 pilot jets. For the main jets, one set have #110 main jets and the other one #124. Is it worth trying the #124 with pods or for sure it will be way too rich?

[Pat Conlon]

Mikuni jets are numbered in increments of 2.5 (110, 112.5, 115, etc) so perhaps your 124. mains are not Mikuni....or you mean you have #125 main jets, not 124.

IMHO Mikuni #125 main jets are too rich for your application.

If you have Dynojet main jets, those sizes are propriety and not comparable to Mikuni size numbers, and they are sized to match the special Dynojet needle and should be used together (Dynojet mains and needles) unless you wanted to convert both the needles and mains over to Mikuni.
IOW don't mix Dynojet goodies with Mikuni goodies.

[stou]

I don't know what they are but they really are #124, so probably not Mikuni jets. I will take no chance and order some #117.5 like you suggested. Thanks!

[Pat Conlon]

Post a picture of your needle....let's be sure you have the Mikuni needles before you order Mikuni main jets.
The Dynojet needles are skinny and the Mikuni needles are thicker with a stepped taper.

[fj1289]

Post a picture of your needle....let's be sure you have the Mikuni needles before you order Mikuni main jets.
The Dynojet needles are skinny and the Mikuni needles are thicker with a stepped taper.

This is IMPORTANT!  Any main jet recommendation has to go with the corresponding needle!  At WOT the needle does make a difference to the main jet flow - no matter anything else you may see in carb jetting tutorials. 

[stou]

The needle look good, here's a picture