394XP low on max rpm after port work

[Mastermind]

Good thought Jer [emoji106]

Happened on my ol Poo Lawn.

Never seen that on a 394.

 

[Termitebuffet]

Happened on my ol Poo Lawn.

Never seen that on a 394.

Me either ,but they always that chance bro ...you know our luck ...[emoji106]

 

[Termitebuffet]

Happened on my ol Poo Lawn.

Never seen that on a 394.

I had an 'ol echo do it ...

 

[Mastermind]

Me either ,but they always that chance bro ...you know our luck ...[emoji106]

Yeah.......If it was raining titties I'd get hit with a big cock.

 

[Termitebuffet]

Yeah.......If it was raining titties I'd get hit with a big cock.

Me and you both ....[emoji106]

 

[MattG]

Good thought Jer [emoji106]

No cos, he's press+vacced tested it out fine.

 

[Termitebuffet]

No cos, he's press+vacced tested it out fine.

Missed that ...my bad

 

[Adirondackstihl]

No cos, he's press+vacced tested it out fine.

If the bar oil cap is in place, it will test fine.
Try again with the cap off!

 

[thomas1]

Yeah.......If it was raining titties I'd get hit with a big cock.

Or if you went out on a Friday night.

 

[thomas1]

Or Saturday thru Thursday.

 

[MattG]

If the bar oil cap is in place, it will test fine.
Try again with the cap off!

Good point. You might *still* see very slight leakage through the oil valve...but still something I'll remember for future P/V tests of mine.

 

[srcarr52]

What's the pop off pressure of the carb. Sounds like you have the wrong spring in it.

Or a leaking welch plug.

 

[Jimmy in NC]

What's the pop off pressure of the carb. Sounds like you have the wrong spring in it.

Seen lots of kits that the replacement spring is way off.

Sent from my SM-G920V using Tapatalk

 

[MattG]

Seen lots of kits that the replacement spring is way off.

Sent from my SM-G920V using Tapatalk

In what way exactly Jimmy? Do you mean too springy or not springy enough? etc.

 

[srcarr52]

Not springy enough or too short in this case.

 

[Jimmy in NC]

Not springy enough or too short in this case.

Exaxtly. When they pop off too early they flood like no tomorrow.

Sent from my SM-G920V using Tapatalk

 

[Timbco84]

What's the pop off pressure of the carb. Sounds like you have the wrong spring in it.

Or a leaking welch plug.

I didn't check the exact pressure, I had the mity vac at 10 psi and just bumped to metering lever to make sure it popped off and then re-sealed. What is the pop off pressure supposed to be at? Also, what is the preferred sealant for sealing welch plugs?

 

[Timbco84]

Sounds like you need to just try a replacement carb and see what happens. Maybe someone here can help you out with one.

Again, not that familiar with the model. Even though the carb pressure tested OK, it's somehow getting excessive fuel into the carb bore. Not sure if this model ever came with a governed carb.

Are you sure the kit was correct for the carb? I've seen discrepancies in the metering button/lever/needle before.

Did you install the metering side gasket to carb, then metering diaphragm, then metering plate?

Case sucking bar oil?

Yeah I double checked that the carb kit was correct, checked to make sure metering diaphragm was engaging the metering lever, and checked to make sure I had diaphragm on the correct side of the gasket. I then tried the original needle/metering lever just to rule out the new one as the problem. I also confirmed that the case isn't sucking bar oil, I just went through that with a 044. I went ahead and ordered a new carb to try, I won't expect to see it for a week or so, I will update when i get the carb and try it.

 

[srcarr52]

I didn't check the exact pressure, I had the mity vac at 10 psi and just bumped to metering lever to make sure it popped off and then re-sealed. What is the pop off pressure supposed to be at? Also, what is the preferred sealant for sealing welch plugs?

It should be above 20 psi.

I've used nail polish or super glue to reseal Welch plugs.

 

[Hinerman]

You guys are good......better than good.