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FJ1100 Won't Run

Started by SpazmaticAA, March 30, 2020, 09:21:51 AM

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SpazmaticAA

I'm fixing up my Dad's old FJ1100 that's been sitting since at least 2006. So far I've gotten the starter motor to work. My next issue before tackling the clutch, suspension, and brakes is getting the engine to actually run. However that is where my problem lies. We've managed to get the carbs off and clean those. That was my first job working on the bike. I've installed it and after getting the starter motor to work the closest thing to ignition I've backfire while trying to start it with my Dad. Any ideas on what could be going on? We've also checked the spark plugs and we are getting spark to them, and the engine does turn over.

Pat Conlon

Is gas getting to the carbs? Did you try some starter spray?
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

SpazmaticAA

The gas tank currently isn't hooked up. We poured gas into the carbs and tried starting fluid but the bike still doesn't start. There were a few putt putt's after trying to start then after a few more minutes trying to start it we stopped after it backfired and nearly deafend both of us

Pat Conlon

I am assuming you properly cleaned those carbs and replaced all the dried rubber o rings.
Now, replace the dried o rings on the intake manifold (between the manifold and head)

Cleaned the carbs but did not replace the o rings?  Fail.

Buy this kit....you need this kit: http://rpmracingca.com/proddetail.asp?prod=carbkit

It has everything you need and then some....The best $24 you will ever spend on your FJ...by far.
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

RPM - Robert

Got the plug wires hooked up correctly?

FJ_Hooligan

Was the backfire back through the carbs or in the exhaust?
DavidR.

SpazmaticAA

Quote from: Pat Conlon on March 30, 2020, 04:40:54 PM
I am assuming you properly cleaned those carbs and replaced all the dried rubber o rings.
Now, replace the dried o rings on the intake manifold (between the manifold and head)

Cleaned the carbs but did not replace the o rings?  Fail.

Buy this kit....you need this kit: http://rpmracingca.com/proddetail.asp?prod=carbkit

It has everything you need and then some....The best $24 you will ever spend on your FJ...by far.

I didn't see any O rings when i cleaned it. So maybe didn't do it thoroughly enough.

SpazmaticAA

Quote from: FJ_Hooligan on March 30, 2020, 07:45:43 PM
Was the backfire back through the carbs or in the exhaust?

Back fire was through the exhaust we're pretty sure.

SpazmaticAA

Quote from: RPM - Robert on March 30, 2020, 04:55:57 PM
Got the plug wires hooked up correctly?

Yep haven't done too much with the spark plugs. Just took them out to see if the engine would even turn over by putting it in gear and rolling it across the floor. That and to check spark but never took more than 1 out at a time.

fj1289

It seems it takes someone new to real carb cleaning about three tries to get the job done well enough to be effective.  Gasoline in the last decade or so is so much nastier and leaves a much worse varnish/goo/crap than it used to.   These bikes do get grumpy about the idle system getting gummed up.  It will take a very thorough carb cleaning of all the small passages to be effective.  And the o-ring and fasteners kit Pat is definitely worth it. 

RPM - Robert

Quote from: SpazmaticAA on March 30, 2020, 11:05:45 PM
I didn't see any O rings when i cleaned it. So maybe didn't do it thoroughly enough.

If they weren't completely torn down like this; they are most likely not clean. There are a minimum of 20 o-rings we replace every time we rebuild carbs not including the throttle shaft seals or intake manifold o-rings.

andyoutandabout

Yep, I'm a believer- those carbs need experienced eyes and hands else much pain can come your way.
life without a bike is just life

SpazmaticAA

Quote from: andyoutandabout on March 31, 2020, 12:32:20 PM
Yep, I'm a believer- those carbs need experienced eyes and hands else much pain can come your way.

Well this is my senior project to graduate High School so I have to do this myself. Well I'll talk to my Dad about ordering the new O-rings. I'm not sure how my Dad feels ordering from vendors other than ebay or amazon.

copper

If you need to understand RPM, look at all of the reviews. Plus Randy also owns this forum your source of info. Fear not buying from RPM, Randy and Robert are the source you need. http://www.fjowners.com/index.php?board=28.0

T Legg

Copper is right. Amazon and eBay don't give good solid advice that is worth more than the cost of the bag of o-rings and stainless steel screws.And you can depend on RPM not to sell crappy parts.
T Legg