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Post by AtariGuy on Apr 5, 2017 15:30:51 GMT -5
I had another "i'm a tool" moment. My pickup wasn't gapped right. Regapped it, then had to dash off to work. I'll take it for a test ride tomorrow, but the pickup is set to 8 thou now...
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Post by pinkflames420 on Apr 5, 2017 16:26:12 GMT -5
What about the umm, float "needle" I think it's called. The little plug thing that attaches to the float and plugs/clogs the fuel inlet. i know you checked the float, but the actual little plug itself? MY float assembly includes the float and the needle. There's a little metal tongue on the float that keeps it level. Yup went through that last night, thought that was the culprit. Another test run last night after i cleaned the float valve (needle) and the seat (brass tube the needle sits in) but still died on me. Did another diagnosis run today so i could examine the plug when it dies. Plug was soaking wet. So i must be losing spark especially at higher rpm. When it don't spark, fuel floods the cylinder shutting it down. I'll try to rule out anything else spark related first though. I found a dennis kirk article on troubleshooting electrical that i'll share at the bottom of this post for anyone else interested. I just have to find my multimeter and poke through all the cords... www.denniskirk.com/learn/how-to-diagnose-motorcycleSorry, I must be still getting the names down for everything lol. "FLOAT VALVE" got it! Didn't mean to make your repeat yourself.  |
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Post by spaz12 on Apr 5, 2017 16:34:09 GMT -5
Sounds like it's running out of fuel like Ryan and John said. Did you check fuel flow with the fuel filter? It could be backward or clogged enough to slow the fuel enough to starve the carb. i decided to stir up the neighbors last night after i cleaned up the float valve seat. I wanted to try eliminating a hot motor too. Started, idled about 15-20 seconds, 1/8 throttle two blocks to the industrial road, then hopped on it. Died a half mile down the road. Checked my carb bowl the second i stopped, it was full. 90 jet installed currently. spaz12 it is a clean tank, clean lines, filter installed with arrow pointing in the flow direction. I disassembled all that yesterday and reassembled it to be sure. Brand new filter only used since this rebuild. Replaced petcock with manual shutoff yesterday. Added a vacuum plug to the manifold nipple on the carb. I did a quick flow test of the line before i hooked up the carb, flowed well. Hooked up the carb, turned the shutoff on again, started and took my test run. I did do several leakdown tests prior to my first start. Sealed the cage to the engine since was the only leak i found then retested to verify. After my first start and the stator fail, i removed the engine for inspection, did another leakdown including soapy water just to be positive. Engine halves, reeds, base gasket, head gasket all were airtight. Only airleak i had was a slight bubble from my exhaust port blockoff plate. I will do another leakdown test to be sure. Cracked reeds could be the problem? I guess i don't quite understand how it would cause the engine to straight shut down like this. I'll pull them friday and check on them though. You have a clear fuel bowl? How do you know that it was "full" when you pulled over and checked it? Anyway, I had a brand new filter that wouldn't flow enough so that's why I suggested it. |
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Post by AtariGuy on Apr 5, 2017 16:56:38 GMT -5
I pulled the gas line from the carb nipple and let it run into a gas can. Flows fast enough to drain a half tank in 3-5 minutes. The flow coming from the line is strong and smooth, no gurgles or hiccups. I have a video but it was shot in the dark with garage lights. I'll take another tomorrow during daylight hours. And yessir the fuel filter is a clear housing type.
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Post by spaz12 on Apr 5, 2017 17:01:42 GMT -5
What carburetor are you using? PHBG? If so, did you remove the copper disk from the main jet?
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Post by niz76 on Apr 5, 2017 17:12:34 GMT -5
Might be a bit rich with the 85 mj and fouling the plug out at WOT?? May want to try a new plug and maybe drop to an 80mj and see what happens- this is why I love tuning with a CHT. You can go a little leaner and shut her down b4 it gets too hot. Great for finding that optimal safe range without being overly rich. Just throwing some ideas out there...
Sounds pretty good b4 it dies out though!
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Post by AtariGuy on Apr 5, 2017 17:23:13 GMT -5
Oh fuel bowl. I shut off the gas line right away and dumped the fuel into a cup i brought with. Matches my bowl capacity that i marked before the trip
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Post by AtariGuy on Apr 5, 2017 17:26:23 GMT -5
spaz12 nope, stock mikuni carb. Stock airbox (new replacement from PFS) with snorkel removed. niz76 i would love to get a cht meter. I know it would make tuning soooo much easier.
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Post by ryan_ott on Apr 5, 2017 17:59:51 GMT -5
Where is your needle set? Top- lean / bottom- rich.
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Post by AtariGuy on Apr 5, 2017 18:24:09 GMT -5
Where is your needle set? Top- lean / bottom- rich. 5 slots, its set middle right now |
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Post by AtariGuy on Apr 5, 2017 19:41:00 GMT -5
What carburetor are you using? PHBG? If so, did you remove the copper disk from the main jet? i would love to get one of those carbs. Granted, my tuning knowledge is slightly greenhorn right now, but it would be nice down the road. I've been searching out prices on those, i'm finding a lot of clones though. I imagine they would have a lot of inconsistent tolerances between the slide and bore, etc. Any tips on finding a non-clone at a good price? |
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Post by spaz12 on Apr 5, 2017 22:42:13 GMT -5
treatland is constantly having sales so that would be a good place to look. Or look on ebay for a used one.
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Post by AtariGuy on Apr 6, 2017 10:55:26 GMT -5
Update, still haven't tested my engine since regapping my pickup coil on my stator, but pretty sure that a .040 gap is way out of bounds. Reset it to .008 now, will reassemble the plastics soon and take it for a venture. Here's hoping...
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Post by pinkflames420 on Apr 6, 2017 13:27:03 GMT -5
Update, still haven't tested my engine since regapping my pickup coil on my stator, but pretty sure that a .040 gap is way out of bounds. Reset it to .008 now, will reassemble the plastics soon and take it for a venture. Here's hoping... Is it raining in your area a lot? I won't be putting the plastics back on mine until everything is running...and after plastics get a new colour. |
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Post by AtariGuy on Apr 6, 2017 14:57:52 GMT -5
No not raining a lot. Mine mocks up and down quick though. Broken plastics are nice like that.
Well i don't have to guess anymore what my problem is. The pickup gap wasnt the issue. Ya'll were right, its not gettin enough fuel. The float needle won't drop open with the float. I get a drop or two flow every couple seconds. I need to fab a clip thats missing that ties the needle to the float tab to pull it open. Without the needle in, it flows awesome. So the needle...
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