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its backfiring what the hay!!??!!??!!?(hey EARL!)

  • Thread starter Thread starter bybowtie
  • Start date Start date
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bybowtie

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Finally I have combustion!!! problem is its backfiring through the carbs!!!!!
It only happens when I am at W.O. choke..!!! Any Ideas I have 6 days before the big ride I can almost taste it! help! Thanks yall
 
Re: OK im getting close!!!!

Re: OK im getting close!!!!

Full choke may be flooding it. My 750 takes about 1/3 choke when cold and my 1150 takes about 1/8th.

Earl

bybowtie said:
Finally I have combustion!!! problem is its backfiring through the carbs!!!!!
It only happens when I am at W.O. choke..!!! Any I deaas I have 6 days before the big ride Ican almost taste it help! Thanks yall
Click to expand...
 
just who I was hopings to respond, MR experience!!! 8) :) that will cause the backfire, what is the best way to start a bike thats been down about 6mos?? I am hoping I can get it tonight it would be a great weight lifted off my shoulders!
 
ok no choke at all and its still backfiring.. worst yet I cant for the life of me find my manual!!!!!anyone out there have and insight?>? thanks
 
Are the backfires occuring at idle and/or with a little throttle? In that case try turning the air screws to richen it up a bit. Any comments on this from the experts???
 
Which bike is it? Does it have an electronic ignition that is adjustable.
Does it at least have timing marks so you can clip a timing light on it to check timing. Will it run long enough that you can use a timing light?

Earl


bybowtie said:
ok no choke at all and its still backfiring.. worst yet I cant for the life of me find my manual!!!!!anyone out there have and insight?>? thanks
Click to expand...
 
ok figured thisa one out.. used the 1,4 2,3 firing order I saw elsewaqre in a topice.. well that was causing the backfire.... so I swapped it to 1.3 2.4 which is what I thought it was to begin with...........now she hummmmmmmmmmsss well sort of (see other post OH NO GOT A GUSHER!!!) thanks for all your help!
 
1 & 4 and 2 & 3 are where the plug wires go for the left and right coils. The
left coil spark plug leads connect to cylinders 1 and 4. The right coil spark plug leads connect to cylinders 2 and 3. That is not the same thing as firing order. :-) :-) The firing order is 1, 2, 4, 3.

Earl



bybowtie said:
ok figured thisa one out.. used the 1,4 2,3 firing order I saw elsewaqre in a topice.. well that was causing the backfire.... so I swapped it to 1.3 2.4 which is what I thought it was to begin with...........now she hummmmmmmmmmsss well sort of (see other post OH NO GOT A GUSHER!!!) thanks for all your h
elp!
Click to expand...
 
thats what I meant.. I put coils 1 on 1,3 and coil 2 on 2,4 and its running fairly smooth w/exception of the gusher!
 
Well, regardless of how it appears to run, I can say absolutely, that is incorrect.
Earl

bybowtie said:
thats what I meant.. I put coils 1 on 1,3 and coil 2 on 2,4 and its running fairly smooth w/e
xception of the gusher!
Click to expand...
 
Put it back the way it is supposed to be. There is a problem that has to be found. The correct way is left coil spark plugs wires go to cylinders 1 and 4.
Right coil spark plug wires go to cylinders 2 and 3.

Do a check for me on this:

The negative terminal on your left coil should be a white wire. Look at your left pointset and see if it also has a white wire connected to it.

The negative terminal on your right coils should be a black wire. Look at you right pointset and see if it has a black wire connected to it.

These two wires (black and white) will be plugged into a connector under the left side cover and should be plugged black to black and white to white. Verify that they are.

Tell me what you find.

Earl
bybowtie said:
where do I go now?
Click to expand...
 
only one problem.... I have just installed ACCEL coils.. they are (according to the manual) no polarity sensitive...so now what. Im with ya earl I wan to get this thing buzzing and I know you know how.. thanks keith
 
OK I made an error... Took another look at it and the coils are reversed
so now it s 1=2,3 ;2=1,4. So now thats good... it does however seem to run a bit rich, left bank of exhaust is quite a bit hotter than the right. Also when not runnig an airfilter(iwas just trying to get it running didnt think it would :lol: ) the left 2 carbs(1,2) pop a bit and the right 2 run smotth, I cant really rev it too much.. But if I add the filter it revs like a banshee...I am however not to sure on the temperature .. thanks
 
You now have your coils in reversed position, but coil position does not matter. The important thing is that the correct pairs of cylinders are running from the same coil. The pickups on the end of your crankshaft determine which cylinder will fire when. In my earlier post, I was trying to determine if you may have had an ignition wire plugged into the wrong connectors in the harness.

(cylinders 1 and 2 run hotter than 3 and 4)..............
Put the airfilter element back into the airbox. Popping is an indication of a lean condition and greater heat is also an indication of a leaner condition.
Running rich is not harmful, running overly lean is a NO NO.

You would have CV carbs, so I believe you will only have one screw to adjust for synchronizing the carbs. That would be the throttle valve adjustment screw, Carb #3 should be the control carb and not have an adjustment screw. Carbs 1,2 and 4 should be matched to #3. The throttle valve adjustment screw between carbs 1 and 2 adjusts carb 1.
The screw between carb 2 and 3 adjusts carb 2. The screw between carbs 3 and 4 adjusts 4.

Earl

bybowtie said:
OK I made an error... Took another look at it and the coils are reversed
so now it s 1=2,3 ;2=1,4. So now thats good... it does however seem to run a bit rich, left bank of exhaust is quite a bit hotter than the right. Also when not runnig an airfilter(iwas just trying to get it running didnt think it would :lol: ) the left 2 carbs(1,2) pop a bit and the right 2 run smotth, I cant really rev it too much.. But if I add the filter it revs like a banshee...I am however not to sure on the temperature .. thanks
Click to expand...
 
so you think a sync will do it? one more thing It has to be running to sync
right. And by running I mean be at a certain RPM.... My tach isnt functioning as of yet(need to get a new gear) So how do I go about it? Is there anything else to look for? Is a sync gonna fatten them up?Thanks again Keith
 
I like to synch my carbs at a particular rpm, but it isnt written in stone. :-)

Yes the bike has to be running. Turn the idle knob enough that the engine is at a smooth idle. That will probably be an rpm between 1000 and about 1400. Synch the carbs at whatever speed the engine idles well.
Synching the carbs has to help. You said #3 was rich and #3 is the control carb, so you will not be able to change its mixture and will be setting the rest to match it. So, my inclination is that synching will richen up #1 and #2.
#4 will probably remain close to the same. (just my guess though) :-)

Earl


bybowtie said:
so you think a sync will do it? one more thing It has to be running to sync
right. And by running I mean be at a certain RPM.... My tach isnt functioning as of yet(need to get a new gear) So how do I go about it? Is there anything else to look for? Is a sync gonna fatten them up?Thanks again Keith
Click to expand...
 
sounds about right. 1 is leanest 2 lil less 3 almost right 4 is cold...... Ill give it a try andlet you know.. gotta find a sync tool first
 
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