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#1 |
AMA Supersport
Join Date: Nov 2008
Location: Odessa, TX
Moto: 2000 Honda CBR1100XX Blackbird
Posts: 4,931
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I picked up this 84 Z50R in a trade with a guy. Bike seems to be in decent shape, he told me it wasn't running and he hadn't ridden it in 2 years or so. He had like 5 50's in his shop. (For those of you that remember Shugga from SBN and Stuntlife.com, that's who I got it from)
Anyway, so I got it, turned the gas on and cranked it for a bit....low and behold I got it to fire up. Rode it up and down the street. It was running but not very well, didn't have power under full throttle and had poor throttle response. So, shop manual in hand I took the following steps: 1) Changed the oil only to find that the oil in it was brand new. 2) Bought a new air filter 3) Drained all the old gas and filled it with fresh 87 4) Removed the carb, sprayed and soaked with Carb cleaner After all that it ran more poorly, as seen in this video. This is the first time it was started today and fired right up after a couple of kicks on choke: ![]() So I pulled the spark plug, which appears to be getting good spark. It looked pretty good, but just in case I replaced it with a new one. Here's the original: ![]() That didn't make any difference. Right now the jet needle is on the factory default second notch from the top. However I have tried 1 through 4 without any varied result: ![]() This video was taken after the spark plug change: ![]() Here are some more pics of the carb: ![]() ![]() ![]() So, any suggestions on what to try next? This is really my first shot at anything besides basic maintenance. I should have all the tools I need to work on this lil' 50 motor and I have the shop manual. Any advice or suggestions are greatly appreciated, I know there's some real experienced folks here. I've got all day so if you need some pics or more video for a good diagnosis let me know. ________ Anal Plug Last edited by Kaneman; 05-09-2011 at 08:07 PM.. |
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#2 |
WERA White Plate
Join Date: Nov 2008
Posts: 1,059
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Get the jets out, and make sure they're clear.
One's in that tube, but there should be a smaller diameter one for idle mixture. You should also be able to look the part number of the carb up online and find a diagram for it. |
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#3 | |
AMA Supersport
Join Date: Nov 2008
Location: Odessa, TX
Moto: 2000 Honda CBR1100XX Blackbird
Posts: 4,931
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Also, should I maybe run some fishing string through there or something? ________ Ladder Day Saints - Mormonism Forums Last edited by Kaneman; 05-09-2011 at 08:07 PM.. |
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#4 |
cruiser
Join Date: Nov 2008
Location: on the run
Moto: '09 HD superglide, 16 Yamaha FZ 09
Posts: 2,749
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sounds like you may have displaced a piece of gunk while spraying the carb and it is now lodged somewhere. Just a guess of course but i would clean the carb out entirely. soak it for a while them reassemble.
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#5 |
Moto GP Star
Join Date: Feb 2008
Posts: 12,156
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Run some seafoam through it just be sure the carb is clean. It certainly looks like a carb/fuel issue. You're not blowing smoke and the plug looks good so you aren't running rich. Have you checked valve height to make sure the valves are opening enough?
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#6 | |
WERA White Plate
Join Date: Nov 2008
Posts: 1,059
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While you're not suppose to put anything in it, I've pushed thin wire through them to get some liquid flowing. Just try not to scratch the brass as that will change the flow. |
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#7 |
Serious Business
Join Date: Nov 2008
Location: New York
Moto: 1993 ZX-11 2008 CBR1000rr
Posts: 9,723
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carb boot\seal?
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#8 |
too much time on my hands
Join Date: Jul 2008
Location: the northern district of god damn
Moto: 01 ZX6R, looking for more now.
Posts: 1,802
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very simple. you have a plugged jet somewhere in the system, remove and inspect every jet you can, also check float height and verify its correct.
a valve inspection/adjustment wouldnt hurt either. |
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#9 | |
AMA Supersport
Join Date: Nov 2008
Location: Odessa, TX
Moto: 2000 Honda CBR1100XX Blackbird
Posts: 4,931
|
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I have no idea about valve height so if I get the jets clean again and it still doesn't work I'll try that. The float valve was something else I was wondering if I installed correctly. I fit it into the slot of the float and gently placed it into the corresponding hole on the carb when putting it back into place....like so.... ![]() It goes into this hole, but when installed remains in the slot in the float... ![]() And here are all my parts... ![]() ________ CAT WHEELS Last edited by Kaneman; 05-09-2011 at 08:07 PM.. |
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#10 |
AMA Supersport
Join Date: Nov 2008
Location: Odessa, TX
Moto: 2000 Honda CBR1100XX Blackbird
Posts: 4,931
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Well I can blow through all the jets pretty freely, don't know if that means anything or not.
I'm going to try and go find some of that seafoam, I'll be back. ________ Volcano Vaporizer Last edited by Kaneman; 05-09-2011 at 08:07 PM.. |
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