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Old Today, 11:36 AM   #1
Ramanonos OP
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Joined: Mar 2011
Location: Hood River
Oddometer: 133
Dies on throttle - XL80

Just resurrected a 1983 XL80 rebuild. Starts up on first kick. But I can't give it any throttle. Farts and dies. Carb has been torn down and cleaned. Plenty of throttle play. Slide moves up just fine. I'm stumped. Here's my YouTube vid:
http://youtu.be/db0Zbl_aMVo
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Old Today, 01:10 PM   #2
mcma111
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Location: San Francisco,Ca.
Oddometer: 12,588
Make sure the main jet didn't come loose and end up in the bottom of the float bowl.
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Old Today, 01:12 PM   #3
redprimo
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Joined: Jul 2011
Location: central coast of California
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It's your carb. If I had to guess I'd say you probably missed some of the holes in the emulsion tube. I'd bet good money on the carb. I've had to clean old carbs two out there times to get them running right.
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Old Today, 02:45 PM   #4
Ramanonos OP
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Location: Hood River
Oddometer: 133
Dies on throttle - XL80

Thx. My son's birthday present so I'm hustling. I took everything part again. This carb is clean. Both center jets inside bowl see clear light. Emulsion tubes clear (slow jet inside bowl where relevant on the xl80). I feel like I'm something obvious. Bad gasket seal? It's on tight. Is the throttle slide to blame? I haven't touched the slide yet. Just confirmed that it moved up on throttle. I got a new spark plug just to be sure. Timing and valves are good. 1st kick start up. Spits gas and farts to death on throttle.
http://youtu.be/nrWHt6sm9Sc

Ramanonos screwed with this post Today at 02:59 PM
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Old Today, 03:19 PM   #5
mcma111
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Just what size main jet is in there. It looked HUGE, like I could see straight through it.
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BMW's
58 R26
79 R100s
91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old Today, 03:27 PM   #6
Ramanonos OP
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Location: Hood River
Oddometer: 133
Given the lost condition I found this bike, I'm assuming the main jet is original. I don't know the size. All new gaskets/rings after a 2-day carb dip. I didn't touch the top slide. Moved good with throttle. Throttle has play.
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