Cant get my CMB .45 to keep running

[Derrick Stewart]

Went out to the pond for the first time today(been waiting for this for months)

Any how,got the Seaducer started but it would rev up quite high (even know I had the throttle down)

then it would slow right down and stall

I try numerous times to adjust the needle etc with no luck

Finally gave up after my belt broke

Very frustrating to say the least

Im sure it something simple but I have really no clue as to whats going on

Im a newbie

Im a running CMB.45 with a OPS pipe

30% nitro

Odonnell Blue glow plug

Any Ideas please

Thanks

 

[Ronald Matthews]

Sounds like the fuel flow is restricted, like some lint in the needle valve ass.

 

[dwilfong]

Try a new plug.

 

[Derrick Stewart]

Try a new plug.

So it could be the plug Im using is too cold

Try a hotter plug?

 

[dwilfong]

Try a new plug.

So it could be the plug Im using is too cold

Try a hotter plug?

Could just be a bad plug. not necessarily the heat range.

 

[Michael Costanzo]

hi, also check if the carb has a low side needle,try making it a little richer.when the the end is lean the moter will scream,mike.

 

[anthony_marquart]

fuel flow issue,.. and yeah,. possibly a bad plug.. high rpm at low throttle setting means too much air, not enough fuel... one way or anther.

 

[Derrick Stewart]

fuel flow issue,.. and yeah,. possibly a bad plug.. high rpm at low throttle setting means too much air, not enough fuel... one way or anther.

I swap out the plug for a new one no change

If its fuel flow (to much air not enough fuel)

how do I adjust this?

 

[bsmtboy2]

Start off by checking your fuel lines for a small leak or crack, it may only be detected when pressure is applied. If that checks out, get a pipe cleaner and run through the needle valve. Next put all hoses back on needle and close it . open it up 3 1/2 turns should be a good starting point for a cmb needle. If everything checks out it should run at idle and when you pull the trigger on the throttle it should be about a 2 second delay before the motor screams.

 

[tom galdys]

With all that said, back out the low speed needle so you can just see the O ring and that thing should run at idle great and come right up when you give it the gas.

 

[Ken Hildreth]

what type of cmb 45 is this? RS, hydro ect.

 

[Derrick Stewart]

Purple head EVO

 

[rick lindow]

derric, check the pressure fitting on the pipe, it may be plugged, old residue from fuel, got to have pressure to feed fuel.good luck. Rick L.

 

[harvknox]

This has been mentioned ,but look carefully at your pipe pressure connection.I had the same problem a few years ago on a CMB45RS.We checked all the the lines and flow checked the needle and carb.I was using a 90 degree fitting on the pipe which had a carbon chunk stuck in the 90.Engine would start and run at part throttle on the bench, then die after throwing the boat in and hitting the gas.Cleaned the fitting,no problem.Now use straight or curved 90 degree fittings.Joe Warren solved the problem.Jose Ortiz suggested the curved fitting. Harvey

 

[Andy Greene]

All good suggestions but walk before you run- Can you post a pic of your setup ?

Need tons more info - seeing your setup will help.

What needle are you using ? Pipe length ? What OPS pipe ?

What prop ? Surface or Subsurface drive Seaducer ?

Andy

 

[Johnny Brown]

Pull hose of carb inlet and back flush it ,and change to a hot plug.