When reading this, please keep in mind that I have no experience with motorcycles what so ever. I do with cars though. At this point I am completely lost.
Last I wrote, I was dealing with the 1982 Honda CB750 Nighthawk I bought my dad for Christmas. For a quick recap; It ran fine before we picked it up, it ran fine when we brought it home. It idled high (which is no longer the main problem) after warm, so we pulled the seat off, pulled the tank off, moved the airbox back, and pulled the carbs out a bit to check for throttle actuation + spray carb clean in each mouth - then reassembled. Fired it up, sputtered and died in a second. Wouldn't start again. The battery sucks so it died, and we tried bump starting it 7000 times with no success. Pulled out the spark plugs, cleaned them off a bit, threw them back in, still nothing.
Now, originally I thought it may have been a major leak in the boots from carb to head, but they look like they're on there now, and I doubt it would make that much of a difference for just starting.
Today (finally got around to it) we pulled the tank + seat off to check some more. Here's what we've got:
- Fuel flows from the Petcock/valve fine and there is no prime setting, 1 hose (fuel) from the valve only.
- Drained the float bowls on each carb, full of gas.
- Pulled #1 spark plug and grounded to head; spark present.
- Dripped gas into #1 cylinder, installed plug and attempted to start again - nothing, however i'm not sure how loud 1 cylinder is on a motorcycle.
- Hooked up the battery to my car and cranked repeatedly for around 10 seconds with tank attached; nothing at all.
- Drained float bowls again, small amount of fuel present.
- Pulled #4 spark plug and grounded to head; spark present.
I have no idea where to go from here. It has spark; kinda. I have no reference to compare the spark to, nor a similar good condition plug. It's not very big or strong, but it's blue. Compared to the spark of a car, it's tiny - but it's there. I also have no idea what 1 cylinder firing on a motorcycle sounds like; on a car it's very noticable. Fuel is also making it to the cylinder, for sure. After cranking and pulling a plug again, it was covered in fuel. Air + fuel + ignition is supposed to = combustion. It ran before, why doesn't it now? What the hell is going on?
Any help would be greatly appreciated. I should be able to figure this out but I can't.. it's annoying me now. Does anyone feel like coming to Coquitlam to aid in repair? Beer would be involved for payment.
Thanks again guys!!
(P.S: I'm no longer worried about the high idle speed, I found there is an adjustment screw. )