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Unread 03-31-2008, 04:20 PM   #1
Not Yet Wild
 
Join Date: Mar 2008
Posts: 11
Default 1984 G1 from Missouri

Hello, like the site.Lot of great info.

Got the G1 2 weeks ago, did not run.It run good now with the choke 1/2 on.It sometime dies but when you try to restart it my take 1-5min.
Let me tell you what have done to it.
First I took of the fuel tank and cap and cleaned it out.

Blew out the lines.
New fuel filter
Cleaned the carb 4 times.No kit but took wire and cleaned jets.
The reeds are good,I think.
New gasket by reed box.
New air filter and rubber straps.
New rubber piece that the carb fits into.
Comp. is 110 , Its getting gas , good spark, I am lost on where I am getting a air leak , if that is what the problem is.Thak you for reading , any info would be great.
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Unread 03-31-2008, 04:53 PM   #2
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smallblock450sl's Avatar
Yamaha
 
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,103
Default Re: 1984 G1 from Missouri

Quote:
Originally Posted by mark View Post
Hello, like the site.Lot of great info.

Got the G1 2 weeks ago, did not run.It run good now with the choke 1/2 on.It sometime dies but when you try to restart it my take 1-5min.
Let me tell you what have done to it.
First I took of the fuel tank and cap and cleaned it out.

Blew out the lines.
New fuel filter
Cleaned the carb 4 times.No kit but took wire and cleaned jets.
The reeds are good,I think.
New gasket by reed box.
New air filter and rubber straps.
New rubber piece that the carb fits into.
Comp. is 110 , Its getting gas , good spark, I am lost on where I am getting a air leak , if that is what the problem is.Thak you for reading , any info would be great.
Mark.....You did very well in your diagnost/repair. I would have to say your crank seals are bad. The "primary" (ds) crank seal is easy to change if you have a "special puller" to get the "fixed sheave" off the cranakshaft. then remove the 'oil pump gear drive housing" and remove and replace the bad crank seal. 1/2 an hour job with the right tools. and is most likley the problem. I always change it first. The "flywheel side" crank seal is more time consuming. Remove the plastic covers,remove the flywheel,"MARK" the timing cover plate (so it goes back in the right place), remove and replace the crank seal and replace all the parts. Sounds like a couple hour project (with the new seals). Good luck Dave
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Unread 03-31-2008, 06:10 PM   #3
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Join Date: Mar 2008
Posts: 11
Default Re: 1984 G1 from Missouri

Thanks smallblock450sl,
The primary seal is bad but I didn't know that it could affect the performance.Is air coming and going out of it as it is running?
And were can I buy that puller? And what is the "fixed sheave"?
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Unread 04-01-2008, 07:50 AM   #4
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Join Date: Mar 2008
Posts: 11
Default Re: 1984 G1 from Missouri

Some pics of my G1 , have problems loading pics.
Attached Images
File Type: jpg 3-31-08 pics 030.jpg (75.1 KB, 28 views)
File Type: jpg 3-31-08 pics 031.jpg (81.2 KB, 28 views)
File Type: jpg 3-31-08 pics 032.jpg (70.1 KB, 30 views)
File Type: jpg 3-31-08 pics 033.jpg (77.2 KB, 56 views)
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Unread 04-04-2008, 11:44 PM   #5
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Location: lake county FL
Posts: 327
Default Re: 1984 G1 from Missouri

welcome to the forum!
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Unread 04-12-2008, 10:43 AM   #6
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Cool Re: 1984 G1 from Missouri

Quote:
Originally Posted by smallblock450sl View Post
Mark.....You did very well in your diagnost/repair. I would have to say your crank seals are bad. The "primary" (ds) crank seal is easy to change if you have a "special puller" to get the "fixed sheave" off the cranakshaft. then remove the 'oil pump gear drive housing" and remove and replace the bad crank seal. 1/2 an hour job with the right tools. and is most likley the problem. I always change it first. The "flywheel side" crank seal is more time consuming. Remove the plastic covers,remove the flywheel,"MARK" the timing cover plate (so it goes back in the right place), remove and replace the crank seal and replace all the parts. Sounds like a couple hour project (with the new seals). Good luck Dave
Not to be Hijacking the thread but I am having the same types of issues and think this thread needs to stay active for awhile: I have one (G1 gas) with the same problem and I was told to look a the (crank) bearing, as there IS some noticeable up and down play ....... Do the cases need to be split to get to these bearings? ..... if that is the issue, does anyone know where there is an exploded diagram of this motor ............ so I don't screw up anything in the process? Plus, I'd like to see what I'm going to be looking at BEFORE beginning this project.

Thanks

Last edited by Boris; 04-12-2008 at 10:46 AM.. Reason: edited post
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Unread 04-12-2008, 11:39 AM   #7
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Yamaha
 
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,103
Default Re: 1984 G1 from Missouri

Quote:
Originally Posted by Boris View Post
Not to be Hijacking the thread but I am having the same types of issues and think this thread needs to stay active for awhile: I have one (G1 gas) with the same problem and I was told to look a the (crank) bearing, as there IS some noticeable up and down play ....... Do the cases need to be split to get to these bearings? ..... if that is the issue, does anyone know where there is an exploded diagram of this motor ............ so I don't screw up anything in the process? Plus, I'd like to see what I'm going to be looking at BEFORE beginning this project.

Thanks
Yes the 2 case halves need to come apart to replace the crank seals. Maybe this site will help you and others. www.yamahagolfcar.com/partsandservice , go to view parts catalogs, you will need to input several things about your car and then you can see the Yamaha parts cataloge for your car ! Good luck Dave

Last edited by smallblock450sl; 04-12-2008 at 11:43 AM.. Reason: web site not input correctly
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Unread 08-28-2008, 10:37 PM   #8
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Join Date: Aug 2008
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Default Re: 1984 G1 from Missouri

Where are u at in Missouri- I am in the central part. HerbB2u. I just bought a 81 g-1 and know what you are going through.
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Unread 08-29-2008, 09:53 AM   #9
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Location: N.E. OHIO
Posts: 165
Default Re: 1984 G1 from Missouri

Welcome MARK.Lots of info.here
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