Failures at low speed between 2000-3000 rpm


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Jorge Caneschi
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Location: City Rio das Ostras, State Rio de Janeiro, Brazil
Motorcycle: Gold Wing Aspencade 1985
Gold Wing Interstate 1985
Mustang Convertible 1969
Jeep Toyota Bandeirantes 1989

Failures at low speed between 2000-3000 rpm

Postby Jorge Caneschi » Sun Mar 06, 2016 1:36 pm



Good morning friends of the Gold Wingdocs, Please I need a help of the experts. I have a 1985 Interstate GL 1200 and the it is failures at low speed between 2000-3000 rpm followed of "sneezings" that can be perceived in the air filter. Well I have done cleaning the carburettor 2 times and the problem persists (slow jet 35 and main jet 108). In my last check and I could see that the cylinder # 4 was not burning when I removed the spark plug wire, the rotation did not change, so I made a substitution only to test the "unit of ignition used" the problem continued, after I changed the spark plug wire of cylinder 4 and the problem continued, last checked drain the carburetor bowl and I could see that it was out of fuel, I thought to have discovered the defect there, then again removed the carburetor, I made a new clean, I changed the float valve needle and seat of the carburetor of cylinder nº 04, and advised me to put a greater slow jet, I put the No. 40 in the four carburetors and the main jet remained the same (108). Well installed the carburetor again on the bike and worked well without faults at low speed, but when trying to equalize the carburetors, cylinder No 04 not equalizes is in the range 40 CmHg while the others in the range of 20 CmHg, and still testing the sparks plugs wire I realized that when I remove the cylinder 04 rotation does not change. The difficulty of removing the coils still can not test them, but when I check the spark plugs, fire can be seen.
Has anyone had a similar problem and could help me. Thanks in advance. :? :?



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twocams
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Re: Failures at low speed between 2000-3000 rpm

Postby twocams » Sun Mar 06, 2016 2:31 pm

Cant help much here. But have you done a compression test to see if that cylinder is close to the others? May be a place to start.

twocams

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Aussie81Interstate
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Re: Failures at low speed between 2000-3000 rpm

Postby Aussie81Interstate » Sun Mar 06, 2016 5:30 pm

Is the piston in the carb top sliding up and down easily or is it scored? - I'm thinking it may be stuck or getting stuck? Make sure the bore is clean and smooth. There might be a tiny burr somewhere.

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Jorge Caneschi
Posts: 15
Joined: Wed Nov 18, 2015 12:16 am
Location: City Rio das Ostras, State Rio de Janeiro, Brazil
Motorcycle: Gold Wing Aspencade 1985
Gold Wing Interstate 1985
Mustang Convertible 1969
Jeep Toyota Bandeirantes 1989

Re: Failures at low speed between 2000-3000 rpm

Postby Jorge Caneschi » Mon Mar 07, 2016 2:35 pm

twocams wrote:Cant help much here. But have you done a compression test to see if that cylinder is close to the others? May be a place to start.


Good afternoon TwoCams, thank you for your attention. I made another attempt to equalize and got in the range of 25 cmHg in the four carburetors, but the symptom of the fourth cylinder when I remove the spark plug wire remains ie the rotation does not change. I am preparing a kit to test the compression ratio of the cylinders, so have ready we report again.
About the exchange of slow jet 35 for a slow jet 40, what is your opinion? It is common in the USA do is exchange? Can bring some damage to the engine? Thanks
Jorge Caneschi

User avatar
Jorge Caneschi
Posts: 15
Joined: Wed Nov 18, 2015 12:16 am
Location: City Rio das Ostras, State Rio de Janeiro, Brazil
Motorcycle: Gold Wing Aspencade 1985
Gold Wing Interstate 1985
Mustang Convertible 1969
Jeep Toyota Bandeirantes 1989

Re: Failures at low speed between 2000-3000 rpm

Postby Jorge Caneschi » Mon Mar 07, 2016 2:48 pm

Aussie81Interstate wrote:Is the piston in the carb top sliding up and down easily or is it scored? - I'm thinking it may be stuck or getting stuck? Make sure the bore is clean and smooth. There might be a tiny burr somewhere.


Ok. Aussie, thank you. When I did the cleaning of carburetors I checked all the pistons and had a little wear but went well without locking.
I'll check in more detail in the next time I clean the carburetor.
After mounting the carburetor and the engine running is a way to check if the pistons are working? Thanks again.




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