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Author Topic: Big problem with K12! Help!  (Read 2371 times)

pave0113

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Big problem with K12! Help!
« on: August 31, 2018, 08:02:58 PM »
Hello, Kymco guys i have a big problem with my K12 from 97' i can't make it to go. So the problem is i start the engine it works good but when i give some gas it whent off. I checked everything the stator, the coil, the spark plug and i change the chocker with new and nothing change! I really need help if you have any idea please share it with me! Thanks in advance!
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CROSSBOLT

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Re: Big problem with K12! Help!
« Reply #1 on: August 31, 2018, 08:26:07 PM »
Check the main jet. It is probably plugged.
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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

pave0113

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Re: Big problem with K12! Help!
« Reply #2 on: August 31, 2018, 08:30:19 PM »
I've open the carb and clean it the jet is clean!
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CROSSBOLT

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Re: Big problem with K12! Help!
« Reply #3 on: August 31, 2018, 08:32:02 PM »
What is the float height? What should it be?
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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

pave0113

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Re: Big problem with K12! Help!
« Reply #4 on: August 31, 2018, 08:34:57 PM »
I dont know i think it is working the float it's open and close i've blow in to check!
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CROSSBOLT

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Re: Big problem with K12! Help!
« Reply #5 on: August 31, 2018, 10:57:01 PM »
The open-close test is valid! However, the float height can really affect engine operation. It would have to be either too high or too low to be noticeable if the bike ran properly before something changed. So the big question is when was the last time it worked normally?
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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

pave0113

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Re: Big problem with K12! Help!
« Reply #6 on: September 01, 2018, 06:54:44 AM »
You might be right  :) I will check again and share!
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pave0113

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Re: Big problem with K12! Help!
« Reply #7 on: September 01, 2018, 01:37:41 PM »
I checked the float is ok everithing looks in order but still when i give gas it is going off!
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CROSSBOLT

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Re: Big problem with K12! Help!
« Reply #8 on: September 01, 2018, 04:22:51 PM »
When was the last time the bike worked normally?
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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

pave0113

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Re: Big problem with K12! Help!
« Reply #9 on: September 01, 2018, 06:22:41 PM »
One year ago. I bought it 2 weeks ago so i dont know exactly when.
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CROSSBOLT

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Re: Big problem with K12! Help!
« Reply #10 on: September 01, 2018, 09:19:28 PM »
OK, we now know that we are dealing with a possible wide range of deterioration, a very old scoot and a suspected variety of previous owner-induced calamities. Since it quits when you open the throttle it is probably a fuel -air problem. The choke, I assume, is an electric by-starter. Is this correct? Is it a diaphragm type carb?
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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

pave0113

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Re: Big problem with K12! Help!
« Reply #11 on: September 01, 2018, 09:26:16 PM »
No it os not a diaphragm type carb and the chocker is new i've change it.
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CROSSBOLT

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Re: Big problem with K12! Help!
« Reply #12 on: September 01, 2018, 11:52:30 PM »
Makes no difference if the choke is new. Some have been defective out of the box. Recommend you test it.
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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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