Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 28, 2013 15:15:36 GMT -6
Good afternoon! Anyone have a manual for a BN157QMJ scooter/motor? I have a couple of different GY6 manuals (122pgs, 182pgs, and 200 pages) but they are not specific to my particular BMS Romans 150cc.  Of course not. I can't seem to locate a good diagram or picture of my carburetor... That being said, Alleyoop, is this the CARB DRAIN SCREW you are talking about?  Meanwhile, I reran the fuel line. I cut off about 3 1/2" of it.   Do I pass? Really appreciate your help - thanks!! < Steve > |
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 27, 2013 22:53:05 GMT -6
Uhhhh...you know I'm new at this...
If I connect the bottom of the tank directly to the fuel line, where do I connect the vacuum hose?
Maybe it's easier to buy a petcock with only two ports...? But...are we sure I need a new one or is it because the old one has the plastic on it?
Q: Evidently, you think that the fuel flow is OK from the petcock and down to the carb. Therefore you want me to check it coming out of the carb, right?
I was looking at the fuel line today. I'll make it shorter and downward then check the flow from the carb.
< Steve >
|
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 27, 2013 18:02:08 GMT -6
|
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 27, 2013 17:05:49 GMT -6
John,
Allow me to re-phrase: How would I install the ones that don't have a nut that I can use to attach the petcock to the bottom of the tank?
Second unanswered question: Do I need a petcock with a lever?
Do appreciate your help!
< Steve >
|
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 26, 2013 21:45:22 GMT -6
|
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 26, 2013 20:17:08 GMT -6
Here's a better shot of the petcock.  |
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 26, 2013 19:45:40 GMT -6
I disconnected the fuel hose from the carburetor. It came out with more pressure the first few seconds and then slowed down. Not streaming, but I didn't notice any dribbling per se.
Then I disconnected the fuel hose from the petcock. I connected a 15" clear hose to it so I could avoid gas all over and see the stream. The pressure was not as strong. But I could only do it once. The vacuum entered into play?
A couple of days ago, kepps1280(?) mentioned a fuel pump.
My next step, kind sir!
< Steve >
|
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 26, 2013 15:43:46 GMT -6
|
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 26, 2013 15:37:51 GMT -6
|
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 26, 2013 11:49:48 GMT -6
Thank you for the info. I don't want to monopolize your time...
The tank is above the carb, I believe. I'll verify it when I get the plastic off.
To answer your questions from earlier: It starts to bog down before it dies. And I have to wait before it will start back up. The longer I wait, the further I can go before it stops again.
If there is a problem with the fuel "system", wouldn't it be consistent and not intermittent? As in it would stop the fuel altogether...?
< Steve >
|
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 25, 2013 20:40:09 GMT -6
It's a DC battery. That's all I can tell ya.  Petcock? I fighting rooster? I think I read that it is attached to the fuel filter? It's getting a bit dark here. Pictures will follow tomorrow - after I take the thing apart again. < Steve > |
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 25, 2013 19:24:56 GMT -6
Know anybody that wants to buy a pretty white scooter? :-|
I made it 1.8 miles this time...
|
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 25, 2013 17:08:43 GMT -6
FANTASTIC directions! Very well said.
The only thing missing is: What if I can't tell if the idle gets any faster?
Does somebody sell a "temporary" tachometer to assist me in this step?
< Steve >
|
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 25, 2013 14:58:36 GMT -6
Should I try to tighten the lock nuts a bit tighter? It keeps moving. Even after the mechanic worked on it...
|
|
Certified Clinician
Currently Offline
Posts: 69
Likes: 0
Joined: Oct 18, 2012 12:48:45 GMT -6
|
Post by Steve on May 25, 2013 14:46:36 GMT -6
tvnacman: What do mean when you say "stock Chinese scooter engines are lean . "?
Does that mean I should turn the air/fuel mixture screw in or out from the standard 2 1/2??
Thanks!
|
|
Of course not. I can't seem to locate a good diagram or picture of my carburetor...
