Seek advice re: TGB r50x scooter -- dies while I'm riding! By tominbmore (Read 8,887 times)

[tominbmore]

Thanks alleyoop. Really sorry to sound like I was correcting you. No offense meant at all.

Looks like maybe I misunderstood what your arrow was actually pointing to.

Anyway now I know where the air/fuel screw is -- that golden screw with the spring under it. Tomorrow after work I'll do the lean/rich test that you helpfully described in your link. I will report the results.

Also, you guys should know that it looks like changing the gasoline wasn't the issue. With the new 93 grade gas in the tank I rode her around for 10 to 15 mins, making sure to go full throttle and up to 35 mph. Then suddenly she conked out on me just like before.

So hopefully this is just a matter of the air ratio screw. I will let you know the results tokorrow. Tx again for your great advice!

[Alleyoop]

Yea I did not think it was the gas if it was the gas it would run but not have so much pep. Yours appears to run good but then quits which tells me it is overheating RUNNING TO LEAN also the other LEAN pointer is the bouncing idle.
Alleyoop

[jwhood32]

These carbs get dirty also the smallest piece of dirt will clog up the jets or could possibly be and airleak somewhere pull the plug and let me know what plug your running or your cdi could be going bad

[tominbmore]

Thanks man!

The bouncing is not as persistent as before, but yes it does occasionally happen... even slight bouncing seems to be common.

Also, I rode it for about 20 minutes again last night.  It went fine, but after a full throttle rev on the straightaway that got the scooter up to 35 mph (remember that on the night I drove it back from the seller's place I got it up top low to mid-40s on flat roads), the scoot called it quits.  Sure sounds like the lean issue you mention.

I will let you know how it goes tonight after I adjust, using the test you provided in that link.

t.

[tominbmore]

Alleyoop 

Hey fellas,

sorry for the gap in communication.  I had a busy week at work, plus some nights with rain which made it hard to work on the scoot.

Anyway, update -- I did the rich-lean test last night.  I am frustrated. I might just have to fork over money to a local shop.

I got the scooter going, got it hot for 5 mins or so.  On its stand, I then turned that gold screw (the one with the spring under it) 1/8 to the right.

(1) The rpm while idling went up a LITTLE.  But I could not tell if it went up enough to warrant continuing to turn clockwise, as the test asks.  I turned it a hair more.  Because I felt the rpms were not still going up, I turned it back 1/16 (my closest guess of 1/16... VERY hard to reach in there and turn it).  Then, scratching my head, I gave it some gas.

(2) It revved, but AFTER I LET GO OF THE THROTTLE, the scoot continued to rev as if some invisible man were twisting the throttle to the max.  Was really going, up to 8000 rpm, and I was no longer even touvching it.  I kind of freaked out then shut her down.  I re-started her, and the same thing happened when I gave her gas.  One time, in fact, without me even TOUCHING the throttle on the handlebar, it started revving all by itself. Poltergeist!!

(3) So, each time I re-started her I tried to re-adjust the gold screw, trying to get it back to where she was before (when this revving thing was not happening).  Once I felt like I got there, and it idled normally for a brief period... but then it did it again after I gave it gas... AND, I was NOT sure that I got it back EXACTLY to where it was before.  I was not doing huge turns of the screw, just little tweaks right or left, and I'm pretty certain it's now back more or less where it was before.  But I am 100% frustrated and puzzled by thjis development.

I was totally expecting to go through the steps of the air/gas carb-tuning test you showed me in this link (http://scooterdoc.proboards.com/thread/7678/2ts-carb-tuning).  But this new problem is freaking me out.

Any ideas, guys?  Thinking maybe I should just find some local shop.  I am a smart guy, and in law school I learnd to problem solve and fix puzzles.  But I'm clearly out of my depth in engine land, and I am finding it really hard to grasp on to all the new terms and learning where things are and what they do, with me being so removed from y'all, and having to rely on pics and vids and back and forth with you guys, etc.

Would love to learn to be a true DIY home mechanic, but I feel like I'm bumping my head against the wall.

Also, do you guys know how much I should expect to pay a mechanic, assuming the issue is just adjustments on outside of the carb, and not getting inside the carb itself?  100$ maybe? More?

Also, is it possible that I was in fact turning the idle screw, and that maybe i never even tinkered with the air ratio screw??

Tx, and Happy 4th guys!!!

t.
 

[tominbmore]

sorry for the double post!!

[Bashan]

No problem, I'll fix your double post. I can't imagine what would be associated with the A/F screw (the gold screw) that could cause RPMs to soar to 8K. Please check your throttle connection and see if you just have a bizarre coincidence where the throttle cable is being hung up by the weather boot or the air cleaner hose is up against the butterfly spring. It sounds like something is hanging the throttle open.

Don't even think about a mechanic. Rich

[tominbmore]

Bashan

Thanks Rich! I appreciate your vote of confidence. I will forge ahead. However, I will ask you to define these new terms. I am afraid I don't know what the throttle cable looks like, or a "weather boot," or "air cleaner hose" or "butterfly spring." Once I locate those things I can look inside to see if one of them is causing this bizarre revving situation.

Tx.

[Bashan]

The rubber boot can get hung up on the cable and the air cleaner hose can get up against the butterfly wheel. Just make sure everything is clear around the carb and then we'll go from there. I take my carb boots off pardner....and leave 'em at the door. Rich

[tominbmore]

Thanks, rich!

[tominbmore]

Here's pics of everything...
First is from right side of scooter. Second is from front of scooter facing back.

[Bashan]

Oh, that's right, it's a two stroke. The carb is different but still things have to be clear around the carb and the cables clear. It appears that you're good on that regard. Let's see if the guys have some ideas on your RPM dilemma. I have to take back what I said, a 2T can act weird like that. We'll work it out, it just might take a little while. Me? I'm going to Wally World and get a plug and oil to service my SYM! I can't wait to wade into the big fella. Guess what I'm riding to Wally World? That's right! Later Brohas. Rich

[jvino]

Rich and alley will get you squared away keep up with them. Congrads on your scooter purchase welcome to the club.

[tominbmore]

Tx man. Yeah I tested her out again. Idled fine. Then I gave her fuel and the idle came back down but with a delay. Then that odd revving started up... All by itself. Sustained revving. Not at 8000 rpm this time. More like 5500 or 6000.

While it was in this state I tinkered witb the bronze screw you guys said was the air fuel ratio screw. Funny thing is... turning it 1/8 either way had no impact on the revving or rpms.
So I shut 'er down. Big mystery to me.

[Bashan]

I created a thread for you on a web site that specializes in these kinds of problems. Think of it as a health care referral to a specialist. You will need to enroll for this site but it's Proboards so no biggie. Here's the thread on 49cc scoot but please keep us informed and you're welcome to keep posting here. Rich