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Author Topic: Venting the Kymco locking gas cap  (Read 158 times)

CROSSBOLT

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Venting the Kymco locking gas cap
« on: April 29, 2024, 11:16:24 PM »
Solved my problem with sudden death and slowly  dying scooter engines. Modern setups have a vacuum operated vent valve that sticks shut.
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Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

CROSSBOLT

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Re: Venting the Kymco locking gas cap
« Reply #1 on: April 29, 2024, 11:18:56 PM »
Quote from: CROSSBOLT on April 29, 2024, 11:16:24 PM
Solved my problem with sudden death and slowly  dying scooter engines. Modern setups have a vacuum operated vent valve that sticks shut.
Remove these two screws and have a good grip on this cover and the two catches because they are spring loaded!
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Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

CROSSBOLT

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Re: Venting the Kymco locking gas cap
« Reply #2 on: April 29, 2024, 11:23:52 PM »
Diassemble the parts being very careful the sequence. Place them in a similar, organized fashion for reassembly.
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Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

CROSSBOLT

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Re: Venting the Kymco locking gas cap
« Reply #3 on: April 29, 2024, 11:25:48 PM »
White arrow points to where vent hole is to be drilled.
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Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

CROSSBOLT

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Re: Venting the Kymco locking gas cap
« Reply #4 on: April 29, 2024, 11:27:07 PM »
White arrow points to the drilled hole.
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Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

CROSSBOLT

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Re: Venting the Kymco locking gas cap
« Reply #5 on: April 29, 2024, 11:31:46 PM »
Put it back together!
The key goes into the slot lined up with tiny triangle at the top of the black cover held on with three tiny screws. The key opens the cap with a quarter turn to the right. Make sure this action works like this after you reassemble!

I'm getting old. Any one have an extra black spring? It's in the shop somewhere...
« Last Edit: April 29, 2024, 11:33:42 PM by CROSSBOLT »
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Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

Iahawk

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Re: Venting the Kymco locking gas cap
« Reply #6 on: April 30, 2024, 12:38:40 PM »
Wow, nice write up! And those little springs will run away any chance they get
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Neil955i

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Re: Venting the Kymco locking gas cap
« Reply #7 on: April 30, 2024, 02:46:30 PM »
Quote from: CROSSBOLT on April 29, 2024, 11:31:46 PM
I'm getting old. Any one have an extra black spring? It's in the shop somewhere...

Yeah I've got plenty Karl, behind the garden equipment in my garage somewhere!
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Regards & ride safe,
Neil

Current garage:  Kymco DTX360 & Triumph Street Triple 675R
Past bikes: BSA C15. Honda S/wing (GL500). Kawasaki GPz750. BMW K100RS. Kawasaki GPZ900R. Yamaha FJ1200 x2. Sprint. Triumph Daytona 900. Kawasaki ZX-7R. T595 Daytona. Kawasaki ZX-9R x2. Triumph Daytona 955i. X-Town

Stig / Major Tom

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Re: Venting the Kymco locking gas cap
« Reply #8 on: April 30, 2024, 03:58:10 PM »
Nice work Karl!

I think it was you who had me drilling a hole in my LIKE's gas cap years ago - when it was doing that imitation of a bucking bronco. (as the TPS failed)
Couldn't hurt!

Man - I learned more about taking my LIKE apart and putting it back together in those few weeks of fairly new ownership when that TPS went south!! Still have some "nothing the matter with these orig. parts" in my tool drawers as the forum recommendations rolled in! ! (fuel pump, coil, plug cap, plugs, plug wire, injector, etc.)

Then you loaned me your KYMCO diag. tool! And we got it solved.

Stig
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CROSSBOLT

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Re: Venting the Kymco locking gas cap
« Reply #9 on: April 30, 2024, 05:13:09 PM »
There was a request for this from an owner of a 2011 DT300i. I knew it would be quicker to do the photos than to find the original post.

Yes, Neil, I have the same spot in my shop! Har, har!

Stig, that was the eyeopener to how disinterested dealers and their techs were in learning their product.
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Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

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