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Got my fj and have some issues? Help

Started by VaughanCustoms, May 18, 2013, 06:50:36 PM

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VaughanCustoms

May 18, 2013, 06:50:36 PM
I got my new bike home and it runs and starts but seems to be out of whack. I tore the bike down and the carbs look clean but noticed that one diaphragm is weak and one is shot. I also noticed on the air box the cover wasn't closed all the way. There is also gas in the air box? The bike was running OK but sticking on the throttle and popping out of the exhaust. Do you guys think these are some of the main issues? I looked up these diaphragms and they are like $80 each? If so I am not sure what to do :(
Built not bought is always my motto.
1967 Mercury Cougar 289 4V bored .30 over forged internals full ground up build
1998 Ford Mustang Cobra convertible DOHC 4.6 .30 over forged internals, future turbo car. 400 rwhp.
1984 Yamaha FJ1100 street fighter V&H exhaust, re-jet, K&N pods.

FJmonkey

#1
May 18, 2013, 07:00:09 PM
Use the search function, alternate diaphragms can be swapped for much less than that. Search "diaphragm"....
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

VaughanCustoms

#2
May 20, 2013, 08:18:39 AM
I ordered some diaphrams from that site. Thanks for the info. The bike has a popping out of the exhaust and needs some throttle to stay running so I am assuming it is running lean? If so I know I have two bad diaphrams and that about all I can see is wrong? Is this my problem? The bike has a V&H full exhaust setup on it and a k&n. The Carbs are very clean and the previous owner said he did a rejet on them. I want to put Uni-pods on the bike do you think I will need another rejet or is this something that there is enough in adjustment for?
Built not bought is always my motto.
1967 Mercury Cougar 289 4V bored .30 over forged internals full ground up build
1998 Ford Mustang Cobra convertible DOHC 4.6 .30 over forged internals, future turbo car. 400 rwhp.
1984 Yamaha FJ1100 street fighter V&H exhaust, re-jet, K&N pods.

pdxfj

#3
May 20, 2013, 02:51:47 PM
The carbs looking clean and actually being clean are two totally different things.

Poke around the files section for carb cleaning instructions and order this kit:

http://www.rpmracingca.com/proddetail.asp?prod=carbkit&cat=39

Do a deep carb cleaning, replace all the o-rings and such.  Then you know where things stand and won't be fighting what the PO did or didn't do...

yamaha fj rider

#4
May 20, 2013, 03:27:05 PM
Quote from: pdxfj on May 20, 2013, 02:51:47 PM
The carbs looking clean and actually being clean are two totally different things.

Poke around the files section for carb cleaning instructions and order this kit:

http://www.rpmracingca.com/proddetail.asp?prod=carbkit&cat=39

Do a deep carb cleaning, replace all the o-rings and such.  Then you know where things stand and won't be fighting what the PO did or didn't do...
+1 The air screws may be too lean and this will cause popping, but a through cleaning is first. The screw and o ring set is best thing you will do for your carbs. Hope this helps.

Kurt
93 FJ1200
FJ 09
YZ250X I still love 2 strokes
Tenere 700
FJR1300ES
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