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1986 XT600 Fuel Line and Carb Setup Questions 1986 XT600 Fuel Line and Carb Setup Questions
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by Sean Howman, The Pamir highway in an unseasonably cold late October, Tajikistan

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Photo by Sean Howman,
The Pamir highway in an unseasonably
cold late October, Tajikistan



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  #1  
Old 30 Jul 2019
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1986 XT600 Fuel Line and Carb Setup Questions
New to this community. Happy to be here and can't wait to ride this bike. Just picked up a 1986 XT600 in pretty good condition. It started up and ran, but backfired like crazy. I adjusted the valves, changed oil/filter*and cleaned the carbs. Unfortunately, I am not sure how to connect the abundance of hoses these carbs have on them. There is a petcock which runs to the fuel in on the carb... This is the bent (90 degree) silver nipple? Then there*

I made a video of my situation:*https://youtu.be/wVfCGE7wJ6I



I've managed to keep an inline 4 XJ550 Seca running like a top over the years, and figured this little dual carb setup would be a cinch, but it seems a little confusing to me.*

Can any one help? Thanks!
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Old 30 Jul 2019
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That huge black thing (ahem) there is part of the California emission system. A "charcoal canister". See:

https://images.cmsnl.com/img/partsli...9d-12_825e.gif

Fuel in line is correct

The port that is missing a hose is the carb overflow/vent that doesn't really go anywhere.

Ps. Do you have the "manual" fuel pump jobby? If not - you might want to put the fuel pet cock to RES and even then add more than a couple of liters of fuel. Without that it won't be able to get the last few liters from the tank.
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Old 1 Aug 2019
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Thanks!

So, I it turned out my float needed to be adjusted (the needled wasn't opening enough to let fuel into the bowl.) Now, I double checked my valves were set at TDC and they are definitely within spec.

Unfortunately, the bike will only start with starting fluid (bad to use, I know) and when it starts it backfires like crazy and will only stay running with throttle.

The previous owner had tried to repair the exhaust with muffler tape (think he laid it down at some point). That (exhaust leak) may be one of the reasons for the backfire, but also thinking it could be a bad CDI.

What do you think? My mom died last week and the services cost a lot of money, so I need to be careful about throwing money at parts. Any suggestions on a good affordable replacement exhaust or CDI?

Thanks for any support. I'm pretty lost here, but determined to get this thing running.
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Old 1 Aug 2019
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Quote:
Originally Posted by Doubleyoupee View Post

Ps. Do you have the "manual" fuel pump jobby? If not - you might want to put the fuel pet cock to RES and even then add more than a couple of liters of fuel. Without that it won't be able to get the last few liters from the tank.
Can you tell me what jobby means? I can't find anything on google
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Old 5 Aug 2019
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Quote:
Originally Posted by 86XT600SEA View Post
Can you tell me what jobby means? I can't find anything on google
It's just a filler word. I meant the manual fuel pump "thing".

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