IM CRYING RIGHT NOW!!!

C

Crunchybeard

Active Member
I have a cb450 1972, getting spark, timings correct, and gas is getting to the carbs. when i go to kick it, the engine turns but doesnt start. Exhaust comes out and i can hear it firing, but its not completely starting on its own. I found gas in the spark plug holes so i checked the floats and the float needle, but there fine too. Im pretty sure it has to do with the carbs, but im so out of ideas im just crying right now lol. any ideas on what i can do? I would really appreciate the help!!! thx in advance.
 
Crunchybeard said:
I have a cb450 1972, getting spark, timings correct, and gas is getting to the carbs. when i go to kick it, the engine turns but doesnt start. Exhaust comes out and i can hear it firing, but its not completely starting on its own. I found gas in the spark plug holes so i checked the floats and the float needle, but there fine too. Im pretty sure it has to do with the carbs, but im so out of ideas im just crying right now lol. any ideas on what i can do? I would really appreciate the help!!! thx in advance.
Click to expand...


its getting tooo much gas, you change the pilot jet? the choke is stuck closed? are both plugs giving a spark?
 
both plugs are getting spark, i havent changed the pilot jet, used the ones the carbs came with, and the choke lever works.
 
havent checked compression cause i dont have a gauge, but i may get one later today. i adjusted the valve timing a month ago but havent rechecked it...guess ill do that now. no air box, was going with pods. and i dont have an exahust on it yet, just some adapters from dcc. thx for the ideas guys this is really helping out a lot.
 
ive screwed in the idle screw all the way in and all the way out lol. been adjusting it trying to get some sort of mixture going but nothin. could i be losing vaccum somewhere?
 
how do i tell if my carbs are adjusted properly? the floats seem pretty heavy. there metal not plastic. is that how they were or should they be plastic?
 
They can be metal or plastic...if they feel "heavy", sounds like you may have pin hole in one of the floats. Pretty common and easy fix. Good Luck!
 
mwm1977 said:
They can be metal or plastic...if they feel "heavy", sounds like you may have pin hole in one of the floats. Pretty common and easy fix. Good Luck!
Click to expand...

I have had this happen. Float fills up with fuel and keeps the valve open which in turn floods the engine.

Also some cheap pod filters have worse airflow than stock so that might not help either.
 
Wonder if this is another case of having the timing 180 degrees out. Did you have the advance unit out and apart? Wires for the coils going to the correct sides?

Floats on 450s are brass, if you take them off and shake them you shouldn't hear anything.
 
Definitely check plug leads/coil wiring is correct, or swap them anyway just to check. Even if the bike is flooding/rich it should fire up when cold for a little while - try full throttle to get as much air as possible into the engine. A bump start will sometimes get an engine past that initial starting problem.
 
Check your oil for the presence of fuel. If the oil has gasoline in it then your float needles are malfunctioning or the floats are damaged.
If not, Pull off the pods and see if it starts with carb spray in the intake. If it idles for a second then you know that it's not getting any fuel and the float levels are too low not allowing fuel to pass.
This exact scenario happened to me on separate occasions.


1969 Suzuki M15-2
1971 Honda CB350
1974 Honda CL360
2012 Triumph Bonneville T100
 
tenseventythree said:
Check your oil for the presence of fuel. If the oil has gasoline in it then your float needles are malfunctioning or the floats are damaged.
Click to expand...

And just to further this, do not run the bike AT ALL with fuel fouled oil. 450 engines have no tolerance for thinned oil, running for even 45 secs is enough to chew up cams and valve followers.
 
My neighbor on his 750 restoration had the same issue. It ended up being the valve that is attached to each float in each carb wasn't closing completely and prevented starting. He gently cleaned each orifice with a small dental tool and that did the trick.

On his though as well he was getting some gas out of the bowl overflow tubes also.
 
thx for all the replies and help guys....i found today that my carb side cam wasnt timed properly, so i just got done adjusting it.... put the cam chain back on (after going through hell) and am about to readjust the valves. I will check my carbs before i put them on. i think it has to do something with my floats. im gonna reclean my carbs and ill post what happens.

again thx for all the replies and ideas. its really helping.
 
You must log in or register to reply here.

DTT Light or Dark

  • DTT Light
    • www.jadusmotorcycleparts.com
    www.lostapostle.ca/
    www.sparckmoto.com

    Spread the Love

    Back
    Top Bottom