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  #1  
Old 10-23-2017, 04:53 PM
darylcaribou69 darylcaribou69 is offline
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Question 1980 xs11 special dies with throttle

Hello all! I've been reading away on this site for a while but this is my first post.

I recently purchased the bike from a guy who had it in the back of his shed for a "few years". The bike is stock except for the exhaust it's a 4 into 2. When I got it I cleaned the carbs, the PO had them "professionally" rebuilt with a K&L kit with 120 main jets. I read that K&L jets are garbage so I bought the genuine mikuni 42.5 pilots. After the clean the bike wouldn't idle so I went ahead and did the second cleaning for the carbs. I broke them off the rack and boiled them. They seemed to work better for a while but when the bike is warm it wouldn't idle and when it did idle it would die when I touched the throttle. Figured it was running lean, I richened the idle mixture, same thing happened. It would take a while to start then would idle nice and smooth, like butter. touch the throttle and it dies. Carb clean #3 followed. Put them back in, bike wouldn't fire at all, replaced the plugs and she came to life. Struggles to start then idles smooth as melted butter soaked silk. Touch the throttle and it dies.

Any suggestions?

Right now i'm just trying to get the bike so I can ride it up the road to see if it's actually worth my time and money. The carbs have a good bench sync, I'm not sure if a bad sync would cause it to die when the throttle is opened.

The only thing I can imagine it being would be something in the ignition. The vacuum advance works, I can see it move when the cover is off. Not really sure what else could be wrong in the ignition department. I'm more proficient with mechanical stuff.

The battery is new. Stock airbox with new filter. No vacuum leaks around the manifolds.

Maybe the diaphragms aren't sealing properly and not allowing the slides to go up? The diaphragms are good, no holes.

Not sure what's going on with it. Any advice will be greatly appreciated.

Thanks,
Daryl
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Old 10-23-2017, 05:04 PM
darylcaribou69 darylcaribou69 is offline
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https://www.youtube.com/watch?v=yYeS0fyTQp8

video of the bike
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  #3  
Old 10-23-2017, 05:18 PM
MaximPhil MaximPhil is offline
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Hi Daryl,
Welcome to XS11.
I like your : I'm more proficient with mechanical stuff.
That covers many of us here on the site. Even some of the electrical gurus hate the electrics
Hang on someone will be along soon with suggestions.
Excellent first post with plenty of detail of what you have done.
Electrickery and ignition is a mystery to me

Phil
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Old 10-23-2017, 06:15 PM
dansmith65 dansmith65 is offline
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Have you looked at the plugs right after stalling it with the throttle? I'm wondering if the mid-range carb tuning is providing the correct air/fuel mixture. Also wondering if you could tell that by looking at the plugs.

Have you checked the fuel level in the bowls? http://www.xs11.com/xs11-info/tech-t...balancing.html

disclaimer: Take what I say with a grain of salt, I have no experience working on these. I have been doing lots of reading and am trying to apply what I've learned.
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Old 10-23-2017, 06:29 PM
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Spark? Advance wires under cover.
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Old 10-24-2017, 12:34 PM
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skids skids is offline
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Quote:
Originally Posted by darylcaribou69 View Post
I watched the video and it looks like it dies when you shut the throttle down(?)
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Down to two 1978 E's. Both stock air boxes with K&N filters, one with 81H pipes and carbs,
One with Jardine 4-1 pipes. 8500 feet elevation.
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Old 10-24-2017, 12:38 PM
darylcaribou69 darylcaribou69 is offline
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That's just my hand going back to the off throttle position after it stalls. Those are some frustrated hand movements. I noticed after I posted it. I put excessive play in the throttle to make sure that wasn't getting hung up while trying to diagnose this issue. I can rev it very little. It'll give me hope it'll keep climbing then it just dies with half a hair more movement in the throttle.
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Old 10-24-2017, 12:46 PM
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So did you find out what kind of carbs you do have? Early, transitional, or later model carbs? Is the airbox appropriate?
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Down to two 1978 E's. Both stock air boxes with K&N filters, one with 81H pipes and carbs,
One with Jardine 4-1 pipes. 8500 feet elevation.
03 Honda ST1300 ABS
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  #9  
Old 10-24-2017, 12:53 PM
motoman motoman is offline
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I would also suggest that fuel levels in bowls are to high or to low. May wanna check those float levels when carbs are off. That initial float setting should be 23mm.
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Old 10-24-2017, 01:02 PM
darylcaribou69 darylcaribou69 is offline
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Pulled the emulsion tubes got 300 x-2 on it with the genuine mikuni stamp in between 300 and x-2. Also no passage between main to pilot circuit.
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Old 10-24-2017, 01:12 PM
darylcaribou69 darylcaribou69 is offline
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When setting the float height do I measure 23mm from where the gasket sits on the carb (the aluminum carb surface itself)? Or do I put the gasket down then measure 23mm (from the gasket surface)? Ive read both on these forums.
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Old 10-24-2017, 02:43 PM
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I use25mm from the bare surface. Make SURE all 8 floats are the same! Sometimes you need to work on it to get them all the same. Also, before you button it up, rotate the carb bank so the floats are down and then back up. Look as yoou do this for anyplace a float may hang up on something.
I ALWAYS mount the bank upside down and try to put some fuel into it, just to make sure there is no seeping or leaks. Lift each float slightly until you see gas, let go and on to the next. Leave for about 3 minutes to verify no more fuel is escaping from anyplace, like the seat "O" ring on the new carbs.
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Old 10-24-2017, 02:43 PM
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Exclamation

No gasket.
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  #14  
Old 10-24-2017, 04:05 PM
darylcaribou69 darylcaribou69 is offline
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Update. I moved the floats to 25mm The bike seemed to do better. The problem area was more noticeable. I would open the throttle slowly and it would climb to between 2000 and 2500 rpms and stumble. When it started to stumble if I opened the throttle wide open it would skip this rpm range and rev awesome. Bike sounds really great. Anyway, this tells me that the transition from the pilot circuit to the main cercuit is my issue. My question would be, will the 120 main jet do that to It? Won't transition but runs awesome up top. Either thats the issue or the "professional" who rebuilt them put in the wrong needles? I am going to order the 110 main jets. The place locally who sells them wants $4.50 each. Can they be had for cheaper elsewhere
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Old 10-24-2017, 04:20 PM
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Quote:
Originally Posted by darylcaribou69 View Post
I am going to order the 110 main jets. The place locally who sells them wants $4.50 each. Can they be had for cheaper elsewhere
These are genuine Mikuni jets for $4.50 each? I use Jets-R-Us and theirs are $6.50 each. Accept no aftermarket jet unless you want to endlessly mess with your carburetors.

http://jetsrus.com/a_jet_kit_street/...ECIAL_1980.htm
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