CH150 - New Carb - Wont idle By davelockard (Read 3,879 times)

[davelockard]

brand new here on the board..

I am at my wits end. I picked up a 85 CH150 Elite, and have slowly been working on it. It is to the point now where it starts beautifully and idles, until it warms up. Then it dies...

Granted, I made some changes:

1. I bought a new carb off ebay, and it's throat is a bit larger than the stock. I had to grind some of the rubber down on the boot that connects to the block. It is a good snug fit, and I don't have any leaks from it; I can spray ether all around it and the engine doesn't race.

2. the new carb was also missing the vacuum port for the petcock. So, I had to tee in another line.

3. the honda fuel system did not have a filter?! I inserted a filter and manual shutoff mid-line. Note: the stock fuel line was a 3/8" line, and the filter and shutoff is a 1/4". I can see fuel in the line and filter, but it does not fill the line completely; Air remains in the 1/4" line. It is all conveniently routed in behind my access panel, so I can close my shutoff and drain my bowl for longer storage.

4. During my troubleshooting, I realized I had 4yr old gas. I drained the tank, cleaned the carb, and added new gas, with an overdose of seafoam.


It starts perfectly, and idles high during warm up. Once the idle starts dropping down, it continues to drop until it stalls.

If I start twisting in the idle screw, the beast wont start. Once it warms up, it pretty much wont start at all!.

I thought my changes might have caused problems, but why would it start perfectly?!

Help, please!

[Alleyoop]

The reason it starts and runs until it is warm is DUE TO THE ENRICHER(CHOKE). Once it the ENRICHER Warms up it SHUTS off the Fuel and now it is UP TO THE PILOT JET to feed it fuel.
So it appears NO FUEL is being drawn from the Pilot Jet.
So take the Carb OFF and Clean the PILOT JET and ITS PASSAGE. Here are pictures of where the PILOT JET is and where the PILOT JET passage are to feed the fuel to the engine.
Alleyoop

Get a Spray Can Of Carb Cleaner it comes with a LONG THIN STRAW which is perfect to put in the holes and spray the PASSAGES. Clean out the PILOT JET and then SPRAY into the PILOT JET HOLE without the Jet in. Spray Should come out by these Tiny Little holes in front of the Carb:

[davelockard]

I have to wait a week or so to check it out and try; I'm out of town. thanks for the quick reply.

When I took the carb apart previously, I pulled the jets completely out, cleaned, and replaced. There was scale building up around one of them... identified as "jet holder, needle" (#17) in this parts blowup.

www.cmsnl.com/honda-ch150-elite-150-1987-usa_model928/partslist/E++17.html

Also, to 'break thru' any sludge, I took apart a piece of network wire, giving me a tiny gauge of wire to feed into the ports. Is it possible I now have jammed something closed?

I have a can of carb dip, but I don't want to put the whole unit in there, and I don't want to take off the diaphragm or bystarter. If I gotta...I gotta... but I'd rather not.

All these internal items screwed down to the stop, with the exception of the one with the pin that actually goes through the body. I counted the turns out, and turned it back in the same number of turns... (Item #7 in the blowup)

Thanks again~

[Alleyoop]

Your CURRENT problem is NOT the needle and diaphgram, so right now you do not have to mess with that. Your Problem is the PILOT JET and PASSAGE:
Here is is the Pilot Jet:
Alleyoop


Here are the PASSAGES and they must be clear. Take out the PILOT JET and Spray inside the hole WITHOUT the Jet in Spray should come out by the Front of the Carb. If it doesn't the PILOT JET PASSAGES are clogged and that is Causing you your current Problem.

[davelockard]

you are amazing. thanks for the graphic instructions.

As soon as I do it, I'll let you know the results.

Awesome...

-dave

[Alleyoop]

Dave,
Once you clean it and put it back Turn the Fuel Ratio Screw Clockwise until it stops, then turn it COUNTER CLOCKWISE 2 1/2 turns and try starting it. Now don't forget the Carb Bowl will be empty no gas so Either you Prime it first(put 2 oz of fuel in it Through the Fuel Nipple then connect the Fuel Hose back on OR it will need some cranking to get it to fill the bowl) before it will get gas.

After the engine warms up if it wants to idle low and die, Turn the IDLE SPEED SCREW 1/8-1/4 turn CLOCKWISE to raise the IDLE to around 1500-1800 RPMS.
Alleyoop

[dryshave]

New to the board.... but have been "knucklebashing" on hondas as long as I can remember.
I've always had electrical problems and have been trying to find a diagram that shows what alleyoop illustrated in the above thread.. many thanx.

I am finishing the resto on an 85 CH150 and have had similar problems. Does the slow jet flow through. When I shine a lite in either end, it seems to reflect light leaving me to believe it is blocked naturally. I've check my other carb and same thing.

I was thinking it's a vacuum leak originally and have checked all lines. I will follow up with your thread suggestions as you've given me valuable intel... thanks again!

Nice trike by the way... kits available?

[Alleyoop]

Yes there are Kits but they are pretty expensive so might as well and spend another Grand and just get the WHOLE DAMN TRIKE(HEHE).
Alleyoop

P.S You should be able to see some light. Most Pilot Jets have a CROSS HAIR WIRE Just below the holes on the sides. So if the PILOT JET is a small one you need a GUITER STRING to go through it. ANY other piece of wire will NOT go through due to the CROSS HAIR WIRE.

If you spray INTO THE PILOT JET HOLE Spray should come out in front of the BUTTERFLY. If those tiny holes are clogged you can take a Small Needle and poke the holes to clear them up.
l

[dryshave]

Cheers! I will check it out tonite when I get home and post my findings tomorrow... I figured that there had to be a flow through.
Been exploring the other threads as well. Great site and love the diagrams. I think I will be able to figure out if my vacuum tube routing is correct off of the diagrams you have up for the models.

Will post pics over the next couple days of my restoration.

[Alleyoop]

Yea just take pictures of around the carb and hose going and coming and will be able to tell if they are connected correctly.
If you do not have emission on that scoot then it is pretty straight forward. If you have a PETCOCK or FUEL PUMP it needs to be connected to a VACUUM coming from the INTAKE MANIFOLD. If your Carb has a ACV Diaphgram that also needs Vacuum so then you would need a "T" to split the Vacuum lines.
Like this my setup on my Trike:
Alleyoop