Honda PA50 Not Running

I’ve got a 1980 Honda PA50 and for whatever reason I cannot get it to run. I’ve got spark and a good amount of compression, but for whatever reason, I can’t get fuel to the engine. The float bowl fills up just fine with no leaks and I’ve cleaned the carb twice on it and the jet is perfectly fine. It’ll run for about a second if I shoot some staring in the motor, but that’s about it.

Re: Honda PA50 Not Running

Jesse Nordlander /

Air leak, probably cranks seals

Re: Honda PA50 Not Running

Daveen Bavari /

Any other possible issues?

Re: Honda PA50 Not Running

The crank seal behind your clutch is likely bad, ive seen 3 bad ones outta 5.

Re: Honda PA50 Not Running

Daveen Bavari /

Okay, I’ll get those changed out and see what happens. It seems to be relatively common from what I’ve read in other forum posts

Re: Honda PA50 Not Running

Daveen Bavari /

Changing the crank seals didn’t solve my issue.

Re: Honda PA50 Not Running

Daveen Bavari /

I’m so confused with this one

Re: Honda PA50 Not Running

Reeds not opening for some reason, perhaps?

Re: Honda PA50 Not Running

Re: Honda PA50 Not Running

Daveen Bavari /

> Brian F Wrote:

> -------------------------------------------------------

> Reeds not opening for some reason, perhaps?

They seem to flap just fine

Re: Honda PA50 Not Running

Daveen Bavari /

> Jacky Chan Wrote:

> -------------------------------------------------------

> Are you sure you put the seals on the right side?

>

> https://www.treatland.tv/honda-hobbit-OEM-engine-crankshaft-seal-15-x-25-5-p/honda-hobbit-oem-seal-729684.htm

>

> https://www.treatland.tv/honda-hobbit-oversize-crankshaft-seal-p/hobbit-not-oem-seal-17-25.5-7.htm

>

> I did mine wrong and didn't notice till I did a leak down test hope this

> helps

The seals are in the correct orientation

Re: Honda PA50 Not Running

Hmm besides cranks seals the only other possible spots for leaks are case seal, base gasket, head gasket, carb intake and head plus decomp.

Re: Honda PA50 Not Running

Daveen Bavari /

> pat splat Wrote:

> -------------------------------------------------------

> Hmm besides cranks seals the only other possible spots for leaks are

> case seal, base gasket, head gasket, carb intake and head plus decomp.

Oh man, I really don’t want to take the engine apart to change the case seal because everything else you listed is either new or in working order XD (edited)

Re: Honda PA50 Not Running

If you locate the leak w a test soap n bubbles then maybe you can superglue or duct tape the leak.

Re: Honda PA50 Not Running

Daveen Bavari /

I checked the case gasket and that’s fine.

Re: Honda PA50 Not Running

Is your plug wet?

Does the fuel drain out of the hose well if you disconnect it from the carb?

Did you replace your condenser? Often you’ll have spark but it won’t run when the condenser is shit.

Lastly, what is your compression reading with s short hose tester?

And are you sure your jets are clear?

You should be able to see thru them, if not... gtr string and some carb cleaner and compressed air is the ticket

Re: Honda PA50 Not Running

How much compression are you getting? "a good amount of compression"

Re: Honda PA50 Not Running

Daveen Bavari /

The plug is completely dry

110 psi

The carb I can assure you is completely clear. It was taken apart entirely, sprayed, and blew compressed air through everything. The bowl does fill up as well.

Re: Honda PA50 Not Running

Does it start w choke? Lots of times i just wanna see a bike run so l load a spray bottle with premix and use that as running fluid. A few squirts in the plug hole to fire it up and squirt fluid down the carb throat and throttle and squirt to hear the motor run and rev out.

Doung that reassures that its fuel related and not spark also lets the motor burn off some cobwebs from sitting so long.

Re: Honda PA50 Not Running

Daveen Bavari /

Doesn’t start with choke. It can run for a little bit if I spray starting fluid in it. The spark plug is completely dry.

Re: Honda PA50 Not Running

If you are getting no fuel there’s only a few things it can be.

1. Reeds not closing

2. Clogged jet (probable cause)

3. Massive air leak causing no vacuum.

4. Clogged petcock

5. No or low compression

Did you literally look thru the jet to see if you can see light thru it? 99% of stock hobbit no fuel issues is a clogged carb.

Re: Honda PA50 Not Running

110 psi with a long hose tester or short hose?

If it’s a short hose that’s low psi. Right on the edge of not running

Re: Honda PA50 Not Running

Dirty30 Dillon /

100% your issue is carburation. JBot got it with the dry plug diag.

Re: Honda PA50 Not Running

Daveen Bavari /

> JBOT Admin Wrote:

> -------------------------------------------------------

> If you are getting no fuel there’s only a few things it can be.

>

> 1. Reeds not closing

>

> 2. Clogged jet (probable cause)

>

> 3. Massive air leak causing no vacuum.

>

> 4. Clogged petcock

>

> 5. No or low compression

>

> Did you literally look thru the jet to see if you can see light thru it?

> 99% of stock hobbit no fuel issues is a clogged carb.

The only thing it could be put of that list is the reeds. I’ve blown and sprayed the carb in every place and yes, I can see light through the jet. The bowl on the carb will fill up with no issues. It’s just not able to get sucked into the engine.

Re: Honda PA50 Not Running

Are you using the metal reeds?

Take em out and look to see if you can again see light thru the ends of the reeds. They can get stuck open with varnish or schmutz.

You really should just do a leak down test.

Re: Honda PA50 Not Running

Daveen Bavari /

They’re plastic ones, so they’re probably slightly warped

Re: Honda PA50 Not Running

Well cut the original metal ones into reed springs that press the reeds shut

Re: Honda PA50 Not Running

Like this.

I bend the springs towards closing before I install, then they push the reeds closed really well

3895D3C2-2BB3-4F16-AD01-526805AABCE0.jpeg

Re: Honda PA50 Not Running

Matt Grantonic /

I agree, carb issue. I like to clean carbs using typical carb/choke cleaner and an air compressor tip at 60 psi or so. ALSO, a strand of fine copper wire through every hole you can find. Funny how you often have to mechanically remove residue when air pressure wont budge it. A very small amount of crud can keep it from running.

Re: Honda PA50 Not Running

Daveen Bavari /

> Matt Grantonic Wrote:

> -------------------------------------------------------

> I agree, carb issue. I like to clean carbs using typical carb/choke

> cleaner and an air compressor tip at 60 psi or so. ALSO, a strand of

> fine copper wire through every hole you can find. Funny how you often

> have to mechanically remove residue when air pressure wont budge it. A

> very small amount of crud can keep it from running.

I’ve already done that 3 times. If you want, I can ship it to you so you can clean it for me XD

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