Author Topic: No fire  (Read 2439 times)

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MaximX

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No fire
« on: June 24, 2014, 04:17:33 PM »
Some of you know I redid the head on my bike.  I have gone through this procedure before, and the last time it fired up right away.   This time it will not fire. I do have spark, fuel, compression. I can only think of one thing that I may have gotten wrong. When cleaning the carbon from the pistons I may have gotten the #1 cyl. off by one rotation....that could make the sparkplugs fire on the exhaust stroke on all cylinders. So I have tried switching the 2 input leads to the coils, that did not work. I put them back then tried swapping spark plug leads....I tried switching from 1-2-3-4 to 2-1-4-3...no luck with that either. Any of you have suggestions on how to get the ignition timing to work without taking the whole thing apart and setting the cams again? It seems to me that I should be able to swap leads and get it to run. Do any of you know the firing order on the Maxim X? I was thinking it may be 1&3, 2&4 at the same time, but now I am unsure...Thanks to any who know this stuff.

Hans

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Re: No fire
« Reply #1 on: June 24, 2014, 04:44:18 PM »
One rotation shouldn't matter, each cylinder fires once per rotation with a wasted spark on the exhaust stoke. If you were a perfect half rotation out, swapping the coil with 1-4 to the coil with 2-3 would get it to run.  Cylinder 1 and 4 go up and down together, 2 and 3 go together. Firing order is either 1,2,4,3 or 1,3,4,2.  From the Fiche, it looks like the left hand coil should service the outside cylinders (1 and 4), the right hand the inside (2 and 3).
« Last Edit: June 24, 2014, 05:06:19 PM by Hans »
I live with fear and danger everyday, but sometimes I leave her at home and go motorcycling.

MaximX

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Re: No fire
« Reply #2 on: June 27, 2014, 03:22:46 PM »
Thanks Hans, that got me off one rabbit trail....and I was very glad to not think about opening up the motor again.  So here is the rest of the story on my experience, perhaps some of it will give you people a smile.  I started again with the electrical wires set as they should be, and it fired up.  That was a relief, seemed to run good so put insurance on it Wednesday.  I drove it down to Yamaha to get one of their $15. (bargain) oil filters.  It did not run right the whole way there, lacking power I noticed, and wanted to stall.  Got there and it died when I let off the gas.  Got the filter, back on the bike and it would not fire.  Not a good feeling.  I messed with the petcock a bit, kept trying and eventually it fired and ran (1200rpm) at 1/4 throttle!....then it took off sort of and I headed home. 
Took the bypass route, pulled off to Massey and was going to go under the overpass towards Pine Center.....well it died just past the stop sign!  So I pulled over to the center meridian.  Again it would not start.  This time stress level is much higher as all of PG drives by on each side plus the cars turning left.  I know I was a blessing to at least 2 Harley riders who went by, haven't  I smiled when I see hogs by the side of the road?  My turn to be humble, haha.   I know not to burn a starter/battery down when nothing is happening even though my desire to have it start is about 11 out of 10 at this point.  No real danger here so I take out my tools and pull off the gas line, surely the motor is not getting fuel as it ran fine earlier when I started out, now will not fire at all.  I blow into the line and it seems plugged.  The carbs must be out of fuel I figure with a plugged line.  I am going nowhere.  The bike has been there at least 15 min. by now, but it feels much longer than that.....
I look over the situation....I have to move this bike.  Traffic coming up the hill is not so thick so I decide to push the bike into the two oncoming lanes and ride it close to the sidewalk down to the massich place parking lot.  That worked out well and I was relieved to have a place to work on it with out the 'under a magnifying glass' feeling.  I then walked home and had supper.  Quite a nice day to do that actually.  My wife drove by me on our street looking quite puzzled as I had my jacket and helmet in hand....Honey I'm home I quipped.
Later I got my tools and went back to the bike.  I had left the petcock on PRI.  I put a fuel filter on it about 20 years ago and I was hoping it was plugged.  Pull it and fuel flows out of it, not that.  Put it back together and try the bike.  It fires right up.  Somehow the carbs are full of gas and ready to go.  I figure that even if the line seemed plugged enough time went by for the carbs to fill up.  Get my helmet, wife, and she follows me home, just glad it is in my garage again.  I am tired of it for now.  Give it a rest, ride the Fazer instead.
So today I pull the carbs to check into that fuel line.  I once dreaded this job, but now with all the  practice I've been getting I am quite good at it.  Carbs look good, take all the bowls off and everything looks as it should and I blow into the fuel line easily when floats are down.  That is good and bad...what is the problem?  Is electrical dying when hot?  I hope not, I hate electrical problems.  I am putting the tank back on and God in his mercy allows the vacuum hose to fall off...it broke actually, no doubt it had a big crack in it while still in place.  Don't they make anything to last anymore?  I know that hose is only 29 years old.  The same vintage fuel line is still good, I just looked at it.  So I splurged and got a brand new 65 cent vacuum line.  Put it back together, go for a test drive.  Runs like new.  Moral of the story...do change those vac. lines after 25 years.  Could have started and ran on the first try perhaps?  I am still a bit confused why it did not start that second time....the carbs should have been full of fuel as I could not blow into them....I don't care, it runs great now......
« Last Edit: June 27, 2014, 03:55:18 PM by MaximX »

Dennis

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Re: No fire
« Reply #3 on: June 27, 2014, 04:53:39 PM »
Glad it worked out.  Good diagnostics.  Yes a vacuum petcock can be a real hassle.

Qball

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Re: No fire
« Reply #4 on: June 27, 2014, 09:55:59 PM »
I am sorry for your greif but so glad you got it figured.
Keep your knees in the breeze and the rubber side down.
We ride  to wash the dust of daily life off our souls.

Hortons Heroes

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Re: No fire
« Reply #5 on: June 28, 2014, 11:21:28 AM »
HOORAYY! That is so good to hear Mike. I am not a fan of those vacuum line petcocks, there was one from a CB550 tank that I put onto my cm400 (has no vacuum lines off of the carb). I just cut the center out of the diaphragm and kept the edge of it as a gasket. The petcock has an off position that stops fuel completely so I really don't see a need for  it.

This all reminds me of this spring when the bobber wouldn't start because the gas cap wasn't vented and was causing a vacuum in the tank.

MaximX

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Re: No fire
« Reply #6 on: June 28, 2014, 08:55:52 PM »
Just thought you all would like to hear something like this.... I am inspired by Peggy Sue whose stories I liked a lot.  As I get older I should know better, haha.  The confusion partly is from my switching from run to Pri. at times and not realizing that the carbs are now filled with gas, that is why I could not blow into the gas line probably.  And at the start I may have not gotten the carbs filled properly so it would start....  Took the X bike out again tonight and it runs very well, as good as it looks, right now it is pretty clean.  The worst part was 2 days ago when the clutch on the Fazer quit working and I had 2 bikes I could not ride!  I flushed its hydraulics and it seems fine so far, the oil was quite dirty.  Now if only I could get the rims shiny on that bike....