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Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

Carbs came back and I reinstalled with no change in performance. Home adjustments with manufacture recommendations over the phone helped a little...

Post by: Shelby Biggs, Jan 23, 2022 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

Thats where the phone number for instructions on adjustments to be made at home comes in handy.

Post by: Shelby Biggs, Dec 22, 2021 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

They have XJ test bikes and motors that the carbs are tested on before shipping out. If all of your cylinders are in an ideal state and...

Post by: Shelby Biggs, Dec 22, 2021 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

I understand your confusion.. I wish I knew more about these carbs. I’m sure they have all the bells and whistles a carb should have, but the...

Post by: Shelby Biggs, Dec 22, 2021 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

You are correct! I was just as surprised. I didn’t think to check the cable because it didn’t even occur to me that it could be the issue. I...

Post by: Shelby Biggs, Dec 21, 2021 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

UPDATE***UPDATE** Keep it simple stupid is what I should have been saying in my head over and over. I had the throttle cable incorrectly...

Post by: Shelby Biggs, Dec 20, 2021 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

Yes I switched the coils to see if the problem changes and it stays the same, unfortunately. I’ve tested resistance on the coils and they are both...

Post by: Shelby Biggs, Dec 20, 2021 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

I’ll upload some photos here. They are Mikuni VM34 carbs with a 2 into 4 setup. These are said to be pre-jetted and synced to my bikes specs....

Post by: Shelby Biggs, Dec 19, 2021 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

Well I finally replaced the caps and coil wire - both 0 ohm high performance yada yada.. and replaced the battery. It will run better.. at full...

Post by: Shelby Biggs, Dec 19, 2021 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

Quick update - Still waiting on the non-resistor caps to come in. I went ahead and ordered a new battery after having mine tested. Tech said it is...

Post by: Shelby Biggs, Dec 11, 2021 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

I am getting 12.89k ohm on the secondary side with caps removed - so the coil appears to be working fine.. The PO stated that when he got it to...

Post by: Shelby Biggs, Dec 5, 2021 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

Okay, thank you. I’ll put some new caps on this week and see if there is any difference. Previously, I had non resistor plugs in with the 1k...

Post by: Shelby Biggs, Dec 5, 2021 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

A little reading suggest that I have the wrong resistor caps at 1k and need non-resistor caps if I have plugs with resistors - can anyone verify...

Post by: Shelby Biggs, Dec 5, 2021 in forum: XJ Technical Chat
Post
1985 Yamaha XJ 700 (Airhead) won't idle without choke

Thanks for the info - I just tested and I’m getting around 2.7 - 2.9 ohms from both the coil and harness. Do you know if that is in spec?

Post by: Shelby Biggs, Dec 5, 2021 in forum: XJ Technical Chat
Thread
1985 Yamaha XJ 700 (Airhead) won't idle without choke

Hello, I have a 1985 Yamaha XJ 700 air cooled bike. This bike has had a huge overhaul and I got it from not running at all to finally able to...

Thread by: Shelby Biggs, Dec 5, 2021, 40 replies, in forum: XJ Technical Chat
Post
1985 Xj700 only has power to blinkers and taillight

They could be white - the color is pretty distorted from age. Side stand relay would make sense. The previous owner did a lot of botched...

Post by: Shelby Biggs, Oct 5, 2021 in forum: XJ Technical Chat
Post
1985 Xj700 only has power to blinkers and taillight

[ATTACH] . I’m not sure if you can identify what it might be from these photos, but I’ve attached them anyway. Plan to review the wiring diagram...

Post by: Shelby Biggs, Oct 5, 2021 in forum: XJ Technical Chat
Post
1985 Xj700 only has power to blinkers and taillight

I started with the basics and checked all fuses and relays. They turned out to be performing properly. Wiggled a few wires and cleaned a few...

Post by: Shelby Biggs, Oct 3, 2021 in forum: XJ Technical Chat
Thread
1985 Xj700 only has power to blinkers and taillight

Hey guys I recently purchased a 1985 Yamaha XJ700 project bike. I bought the bike not running. The guy I bought the bike from said that he...

Thread by: Shelby Biggs, Oct 2, 2021, 6 replies, in forum: XJ Technical Chat

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