backfire and running rich


Information and questions on GL1200 Goldwings (1984-1987)
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steppin stone
Posts: 69
Joined: Sun Jun 03, 2018 5:20 pm
Location: plymouth ma.
Motorcycle: 1986 goldwing 1200 Aspencade

backfire and running rich

Post by steppin stone »



Hello I have an 86 1200 and been working on fixing the backfiring issue. I have replaced starter solenoid, plugs wire's,coils, yesterday I put new timing belt's and pulse generator. It's still backfiring through intake and running very rich. Which bloooow my exhaust which now I have to take off and hopefully be able too repair. Today I plan on taking the carb's off and doing a tear down to see if jet's are gummed up .. any advice this is the first bike I've owned and worked on.



One-T-Matt
Posts: 6
Joined: Tue Aug 20, 2019 9:05 pm
Location: Wisconsin
Motorcycle: 86 GL1200 ASPENCADE

Re: backfire and running rich

Post by One-T-Matt »

Yeeah tear the carbs down and clean them. Might have been the first thing you should have done before all the rest :D :lol:

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steppin stone
Posts: 69
Joined: Sun Jun 03, 2018 5:20 pm
Location: plymouth ma.
Motorcycle: 1986 goldwing 1200 Aspencade

Re: backfire and running rich

Post by steppin stone »

It was running fine when I first got it but slowly deteriorated . I replaced the different part's not knowing when they were done like timing belt,I figured while I was there just replace the P/G.also the coils one was not working so I replaced both with wires and plug's did a tune up.( know I now they're done). Just got the carb's off is there differences between the kit's they have listed on ebay like jet's ? does it matter? should I buy them from there or any place else? As for spending money on useless part's I don't think I have it's 34 years old at least I know what has been done..

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steppin stone
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Location: plymouth ma.
Motorcycle: 1986 goldwing 1200 Aspencade

Re: backfire and running rich

Post by steppin stone »

Okay just finished tearing all the carb's apart and cleaning them which all were very clean I mean there was a little tarnish in the bowl but to my standard's was clean. I then got to the last one and it looks to me like the plunger is missing the tip. should I be able to see a hole in the bottom by the jet's ?

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steppin stone
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Location: plymouth ma.
Motorcycle: 1986 goldwing 1200 Aspencade

Re: backfire and running rich

Post by steppin stone »

Well seeing how I have to replace the slide needle all of the jets are good. I've been on the computer for a couple of hour's now trying to find a rebuild kit but can't seem to find one. The number on the needle is (1CG) the main jet is (105) and pilot jet is (40). If I am rebuilding the carb's does it matter if the jet's aren't the same as they're all being rebuilt? Very confusing first time playing with carb's

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steppin stone
Posts: 69
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Location: plymouth ma.
Motorcycle: 1986 goldwing 1200 Aspencade

Re: backfire and running rich

Post by steppin stone »

okay so i've been on line for hour's today would it make a big difference if I went with this kit? the needle jet (d513) main jet (102) and pilot jet (35) . I just don't want to have to buy another set of kit's after I buy this and put it all back together . any input would be great. If I do buy this kit would it save on fuel ? Would it impede the performance just curious ?

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julimike54
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Joined: Sun Feb 01, 2015 12:21 pm
Location: Euless, Texas
Motorcycle: 1986 GL1200A original owner
2016 HD FLTRU

Re: backfire and running rich

Post by julimike54 »

The following sites are either parts sources or can do the work for you. From my research you don't want cheap alternatives, seems every time someone tries them it turns into a disaster.
Read the Wingovations opening bit....
Motorcycle project is a good source of information and I think they will do rebuilds also....
Good luck

https://www.randakks.com/
https://www.carburetordiaphragms.com/sh ... arburetor/
http://wingovations.com/float-valve-nee ... 4591640610
https://carbjetkits.com/honda-jet-kits/ ... -1987.html
https://motorcycleproject.com/index.html
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Riding anything is a good day!
Mike

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steppin stone
Posts: 69
Joined: Sun Jun 03, 2018 5:20 pm
Location: plymouth ma.
Motorcycle: 1986 goldwing 1200 Aspencade

Re: backfire and running rich

Post by steppin stone »

Thanks for the links julimike54, I searched the links but didn't come up with what i'm looking for. I torn the carb's down and cleaned them all up. when I got to the last carb the slide needle I found the tip was missing like 1/8 inch. There was a burr on the end of it where it was broken so it was making the slide stick. I used a 2000 grit sand paper and smoothed the edge and now moving freely. I buttoned the thing up slapped on the bike and it's running a whole lot better no backfiring or spuddering and idles good. took it for a ride around my development with no issues. So today I've been searching the web again trying to find a needle the # stamped on it is (1CG) but can't seem to find one but i'll keep searching.

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steppin stone
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Location: plymouth ma.
Motorcycle: 1986 goldwing 1200 Aspencade

Re: backfire and running rich

Post by steppin stone »

Hello calling the goldwing god's.
I have been searching the web for days know looking for a slide needle jet with no luck. While searching I found this MIKUNI Genuine Mikuni Jet Needle For HSR42/45/48 Carbs it's a set of (4) if I replace all (4) do I need to replace the main and pilot jet"s also. I ask this because their is nothing wrong with them or could I buy a single needle and try to match it up with the other 3 if that's at all possible.
I also have one more question, I haven't dropped the exhaust as of yet to repair it from one of the backfire's, Hopefully I will be able to weld the seam back. would the leak make it run funny with a leak?
any help would be great full and I want to thank you in advance.

froche
Posts: 282
Joined: Wed Mar 12, 2014 1:56 pm
Location: Vista, ca
Motorcycle: 1985 Goldwing Aspencade (GL1200A)
2002 GL1800

Former bikes;
2000 R1100RT
2005 Suzuki Bandit
1979 Yamaha XS1100
1978 Yamaha XS1100 Special
1990 Yamaha XV250
1980 Yamaha XV750
1979 Honda CB750
1968 Triumph Bonneville T120
1973 Honda CB450
1968 Harley Davidson Sportster
1974 Honda CB750
1968 Honda CL72

Re: backfire and running rich

Post by froche »

I have a needle from 1200 parts. If I make out the number below the top it looks like 20H. I may be able to get the other 3 out.\
Interested?

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steppin stone
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Location: plymouth ma.
Motorcycle: 1986 goldwing 1200 Aspencade

Re: backfire and running rich

Post by steppin stone »

Hello froche, I am interested in them,If I change the # do I also have to change the jet's ?

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ct1500
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Re: backfire and running rich

Post by ct1500 »

steppin stone wrote:
Sat May 02, 2020 4:34 pm
Hello froche, I am interested in them,If I change the # do I also have to change the jet's ?
No hands on experience with the 1200. If they are like the 1500 carbs the needle is the secondary main (jet) the further out it is pulled from the well the more fuel will flow. Probably why they are numbered as Froche said. The pick-up tube will be submerged in fuel of float bowl, one of the straight ones that has no numbered jet.
I could be all wrong though. :)
Local and need repair help with your 1500, Valkyrie or ST please click contact
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froche
Posts: 282
Joined: Wed Mar 12, 2014 1:56 pm
Location: Vista, ca
Motorcycle: 1985 Goldwing Aspencade (GL1200A)
2002 GL1800

Former bikes;
2000 R1100RT
2005 Suzuki Bandit
1979 Yamaha XS1100
1978 Yamaha XS1100 Special
1990 Yamaha XV250
1980 Yamaha XV750
1979 Honda CB750
1968 Triumph Bonneville T120
1973 Honda CB450
1968 Harley Davidson Sportster
1974 Honda CB750
1968 Honda CL72

Re: backfire and running rich

Post by froche »

No idea. I have 1 removed maybe somebody can tell you re the numbers?
Randaks or you could email Mike Nixon carbrebuilder@gmail.com he will probably know.

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steppin stone
Posts: 69
Joined: Sun Jun 03, 2018 5:20 pm
Location: plymouth ma.
Motorcycle: 1986 goldwing 1200 Aspencade

Re: backfire and running rich

Post by steppin stone »

Hello froche,
I sent an email to both of your suggestions and I'm waiting for a reply . If they will work how much do you want for the set.
Thank you Paul

froche
Posts: 282
Joined: Wed Mar 12, 2014 1:56 pm
Location: Vista, ca
Motorcycle: 1985 Goldwing Aspencade (GL1200A)
2002 GL1800

Former bikes;
2000 R1100RT
2005 Suzuki Bandit
1979 Yamaha XS1100
1978 Yamaha XS1100 Special
1990 Yamaha XV250
1980 Yamaha XV750
1979 Honda CB750
1968 Triumph Bonneville T120
1973 Honda CB450
1968 Harley Davidson Sportster
1974 Honda CB750
1968 Honda CL72

Re: backfire and running rich

Post by froche »

Haven't gotten the rest of the carbs apart yet...I will you know if I succeed or fail!

In the meantime maybe you will get the answer you need.



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