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Robodad 09-12-2012 01:12 AM

Could my engines already be swapped ??
 
1 Attachment(s)
I bought a Yamaha G11AK utility cart for really cheap and it didn't run at all, I cleaned out the carb and fuel pump and tank, installed a new electric fuel pump and changed the oil and installed a new battery and it started right up but it smokes pretty bad. I then did a compression test and it pumped right up to 205psi but then leaked down pretty fast so I took the engine out and opened it up and found the valve guide seals to be leaking or so I think. With the compression tool screwed into the spark plug hole I rolled the engine over for about 20 or so seconds and then when I took the engine out there was about a tblsp of oil on top of the piston, also there is like a clean trail on the exhaust side of the head between where the valve seats and the guide (kinda hard to describe) The exhaust valve is on the right hand side and you can see the clean spot im referring to in this photo:




My question is that on the engine block it says its a JN5 300cm3 so will G11 parts fit or is this not the original engine and I have to get JN5 parts.

I'm pretty clueless as to what parts will work with this cart, I just want to be sure to order the right ones the first time LOL !!

Thank You for any information you can provide !!!

smallblock450sl 09-12-2012 06:40 PM

Re: Could my engines already be swapped ??
 
Quote:

Originally Posted by Robodad (Post 775219)
I bought a Yamaha G11AK utility cart for really cheap and it didn't run at all, I cleaned out the carb and fuel pump and tank, installed a new electric fuel pump and changed the oil and installed a new battery and it started right up but it smokes pretty bad. I then did a compression test and it pumped right up to 205psi but then leaked down pretty fast so I took the engine out and opened it up and found the valve guide seals to be leaking or so I think. With the compression tool screwed into the spark plug hole I rolled the engine over for about 20 or so seconds and then when I took the engine out there was about a tblsp of oil on top of the piston, also there is like a clean trail on the exhaust side of the head between where the valve seats and the guide (kinda hard to describe) The exhaust valve is on the right hand side and you can see the clean spot im referring to in this photo:




My question is that on the engine block it says its a JN5 300cm3 so will G11 parts fit or is this not the original engine and I have to get JN5 parts.

I'm pretty clueless as to what parts will work with this cart, I just want to be sure to order the right ones the first time LOL !!

Thank You for any information you can provide !!!

Yes, you'll need to order parts parts for a JN5 engine, although, as I recall, the valves and and valve stem seal (only on intake) are J38 part numbers. Piston/rings/head gasket will need to be JN5.

Robodad 09-12-2012 11:56 PM

Re: Could my engines already be swapped ??
 
Quote:

Originally Posted by smallblock450sl (Post 775570)
Yes, you'll need to order parts parts for a JN5 engine, although, as I recall, the valves and and valve stem seal (only on intake) are J38 part numbers. Piston/rings/head gasket will need to be JN5.

OK Very good, thank you for your reply, I am curious if you know if that JN5 engine came stock in the G11AK or if I am working on someone elses project they didn't get done ?? Also if you can confirm the JN5 is the one year 300ccm engine put into the G14 carts ??

Just trying to determine what the heck I have so I can get the right parts !!

I appreciate your reply, Thank You !!

smallblock450sl 09-13-2012 09:00 AM

Re: Could my engines already be swapped ??
 
Quote:

Originally Posted by Robodad (Post 775691)
OK Very good, thank you for your reply, I am curious if you know if that JN5 engine came stock in the G11AK or if I am working on someone elses project they didn't get done ?? Also if you can confirm the JN5 is the one year 300ccm engine put into the G14 carts ??

Just trying to determine what the heck I have so I can get the right parts !!

I appreciate your reply, Thank You !!

Yes in 1996 G11's had the JN5 engine. Yes 300cm like in the G14. I call them a 1 1/2 year motor, that was there run till the G16 engine came out

Robodad 09-13-2012 10:09 AM

Re: Could my engines already be swapped ??
 
Quote:

Originally Posted by smallblock450sl (Post 775787)
Yes in 1996 G11's had the JN5 engine. Yes 300cm like in the G14. I call them a 1 1/2 year motor, that was there run till the G16 engine came out

Thanks for the information, Ordered the parts I need, should be up and runnin in just a few days !!

Thank You very much !! :notworthy:

Robodad 09-14-2012 09:34 AM

Re: Swapping engines/G2/G9/G8/G14
 
1 Attachment(s)
Here is the buggy I have been working on, You may recognize it smallblock450sl, I picked it up near you in Purdy for like $100 !! :thumbright:

smallblock450sl 09-14-2012 10:47 AM

Re: Swapping engines/G2/G9/G8/G14
 
Quote:

Originally Posted by Robodad (Post 776271)
Here is the buggy I have been working on, You may recognize it smallblock450sl, I picked it up near you in Purdy for like $100 !! :thumbright:

Yep, we (Cart Service Equipment) built that. We had a custom aluminum top frame built for those and a (PNW only) wrap around windsheild. Don't break the windsheild...they retail for 400.00 now!!!:thumbdown: Where you live Robodad?

Robodad 09-14-2012 02:43 PM

Re: Swapping engines/G2/G9/G8/G14
 
Quote:

Originally Posted by smallblock450sl (Post 776305)
Yep, we (Cart Service Equipment) built that. We had a custom aluminum top frame built for those and a (PNW only) wrap around windsheild. Don't break the windsheild...they retail for 400.00 now!!!:thumbdown: Where you live Robodad?

I'm in Port Angeles, Last summer I bought an EZGO 3 wheeled cart for for my then 7yo son for $75 and put new batteries in it and he has ran the piss out of it and now my 13yo daughter and him fight over who gets to drive and on which day in which hour of the day etc... you see where I am going with this ...!

So I decided to get another one but wanted a gas one because those batteries are far too expensive to buy again, opened up CL and there it was super cheap and the guy said he had his mechanic look at it and couldn't get it to run so I took it home and cleaned out all the crystalized crap out of the fuel system and tore the carb all the way down and cleaned every piece and put it all back together and new fuel and filters started right up and ran fairly good but smoked really bad so now I am in the process of doing the rings and rod bering etc... just to see if it will quit smoking.

So thats the extent of my golf cart career LOL !! so I'll be askin more questions for sure !!

Oh I just got another golf cart last month its a Hyundai and put a new controller and F&R switch in it today and now it works really good, not sure if I should unload it now that its working or just hang onto it since I replaced some of the more expensive things.

Allen...

charliew13 03-21-2013 09:56 AM

Re: Swapping engines/G2/G9/G8/G14
 
Been reading but skipped over some of this thread. I was trying to figgure out what the output shaft size is on the jamaha motors. I have a bad motor available and need a variable drive pulley for a horizontal motor I haven't picked out yet. It's for a cc carryall that I'm converting to gas. I have the gas rearend and driven pulley and some of the other gas cc parts but no drive cvt pulley. If I have too I can get a machinist involved but I bet it is easier than that.

I know search, but I didn't do too well.

Charliew

bigblockyamaha 04-25-2014 03:54 PM

Re: Swapping engines/G2/G9/G8/G14
 
would any one out there know the part number for the 300 engine in a g14 needing new engine Thanks

smallblock450sl 04-29-2014 07:03 PM

Re: Swapping engines/G2/G9/G8/G14
 
Quote:

Originally Posted by bigblockyamaha (Post 1019491)
would any one out there know the part number for the 300 engine in a g14 needing new engine Thanks

Sorry I didn't reply sooner, check out your new post.

cgtech 06-28-2015 01:23 AM

Re: Swapping engines/G2/G9/G8/G14
 
1 Attachment(s)
Doing G2 engine swap into G11. Notice significant difference in spark triggering "area", def not compatible. They did not follow my instructions to swap Everything to new motor from old motor, now im finishing the job (after their work trying to get it to run eventually killed the coil, incorrect dwell is my guess).

LoudLowNslow 07-13-2015 12:54 PM

Re: Swapping engines/G2/G9/G8/G14
 
So I have a g9 with a locked up engine, and a spare g2 engine. Is this swap plug-and-play? All I have from the g2 is the engine, no harness or anything

smallblock450sl 07-13-2015 07:05 PM

Re: Swapping engines/G2/G9/G8/G14
 
Quote:

Originally Posted by LoudLowNslow (Post 1177312)
So I have a g9 with a locked up engine, and a spare g2 engine. Is this swap plug-and-play? All I have from the g2 is the engine, no harness or anything

It is just plug and play in your case:thumbup:

Cborkowski 08-03-2015 11:36 AM

Re: Swapping engines/G2/G9/G8/G14
 
Can you put a G8 engine in a G2 cart??

cgtech 08-03-2015 02:41 PM

Re: Swapping engines/G2/G9/G8/G14
 
Swap all the ignition parts from the old motor, and swap the flywheel from the old motor onto the G8 motor. Then it will be a breeze... 8) See my post above about the flywheel, it must have its matching pulser, and they both must be matched to the correct ignitor (electronic ignition box). All the needed parts from the G2 motor bolt right on the G8 motor. Important- Use a steering wheel puller on the 3 bolt holes on the flywheel, Do not use a big "jaw puller" on the outside edge of the flywheel. You can see the puller i used in the photo behind the flywheels.

nitro1 08-03-2015 08:20 PM

Re: Swapping engines/G2/G9/G8/G14
 
Cborkowski u can make it work ;)

nitro1 08-04-2015 07:48 AM

Re: Swapping engines/G2/G9/G8/G14
 
Can a G8 motor fit into a gen 1 yamaha ?

nitro1 08-04-2015 08:58 AM

Re: Swapping engines/G2/G9/G8/G14
 
Found my answer :)

rcorlew 07-17-2016 09:55 PM

Re: Swapping engines/G2/G9/G8/G14
 
G16 to G22???? Or a JN6 engine to a cart with a JR6 engine???
Thanks.
They look the same.

cgtech 07-17-2016 10:38 PM

Re: Swapping engines/G2/G9/G8/G14
 
Quote:

Originally Posted by rcorlew (Post 1296323)
G16 to G22???? Or a JN6 engine to a cart with a JR6 engine???
Thanks.
They look the same.

very close to same, oil level sensor connector is slightly different, but easy to connect.

rcorlew 07-20-2016 10:42 PM

Re: Swapping engines/G2/G9/G8/G14
 
Thank You. The G16 engine runs excellent. The G22 bore is scarred, runs good but smokes like a locomotive. I was looking at the connectors and they look the same. So I am going to start the swap no later than this weekend. Take 2 and make 1 good one.
Again thanks for the help.
Randy

rcorlew 07-20-2016 10:44 PM

Re: Swapping engines/G2/G9/G8/G14
 
Anyone need a decent G16 chassis with a smoking engine????

idrose 09-03-2016 08:16 AM

Re: Swapping engines/G2/G9/G8/G14
 
What about putting a G9 gas motor in a G14 does the same apply just change the pulser coil to from g9 to a g14 and it will work

Benjaminearl 01-16-2017 08:23 AM

Re: Swapping engines/G2/G9/G8/G14
 
I have a g11a .. What motor does that j38 285cc most resemble as far as ignition? I have a jf2 new pulsar coil in it, a jf2 ignitor, how do I know what coil and flywheel I need or have it now? I have to visual spark across plug but my pulsar is new, ignitor works on another running cart so I know that works but I have no spark.. Any help would be appreciated

Dave in VA 01-16-2017 08:49 AM

Re: Swapping engines/G2/G9/G8/G14
 
Quote:

Originally Posted by rcorlew (Post 1297495)
Anyone need a decent G16 chassis with a smoking engine????

Where are you located?

Benjaminearl 01-16-2017 10:03 AM

Re: Swapping engines/G2/G9/G8/G14
 
Utica, ny

Dave in VA 01-16-2017 02:07 PM

Re: Swapping engines/G2/G9/G8/G14
 
Thanks. Too far:thumbup: Always looking for a G16/22 project.

marks141 07-19-2017 08:02 PM

Swapping engines/G2/G9/G8/G14
 
.,'

raydhd 07-19-2017 08:22 PM

Re: Swapping engines/G2/G9/G8/G14
 
I have a mint JF2-81350-00-00 flywheel for any of you that want to swap in a G2/9 engine into your G8/14 cart.

TAPatrick 07-25-2019 10:42 AM

Re: Swapping engines/G2/G9/G8/G14
 
Hey smallblock450sl,
Thanks for the post for engine, ignition, and minor electrical swaps. It is helpful and I understood it. *L*
I need some opinions, I have a G1 I bought and decided I wanted something newer with more options to lift. I bought a G8 with a bad motor and swapped a Duramax 18Hp into it cutting the crank and using the factory clutch. It blew up with probably 30 Hours on it. Back to square 1.
Would you rebuild the original motor or would you replace it with a pressurized BB.

Thanks for your input. Going cheap got me in this position. Can't break the bank but need to do it RIGHT!

davidb 09-22-2019 03:31 PM

Re: Swapping engines/G2/G9/G8/G14
 
Has anyone swapped a g29 engine into a g9?
I'm thinking of replacing the g29 with a 402 Yamaha, and would love to put it in the g9.

cgtech 09-22-2019 09:32 PM

Re: Swapping engines/G2/G9/G8/G14
 
Well, G29 was produced from 2007-2016, and never featured a 402cc engine. I have put a G16 motor in a G9 (externally identical to the motor that was offered in G29). It's a tight squeeze & requires significant fabrication.

davidb 12-25-2019 11:28 PM

Re: Swapping engines/G2/G9/G8/G14
 
Well, the 402cc is in. Love the new drive.
Now about that 357cc that's sitting on the bench...
How significant of fabrication?

Ralphlee 01-12-2021 05:56 PM

Re: Swapping engines/G2/G9/G8/G14
 
Came across this "sticky" and getting great information. I'm doing a G5 engine swap into a G8. Any advice or information how how to do this would be greatly appreciated.

zig1212 06-29-2022 12:11 PM

Re: Swapping engines/G2/G9/G8/G14
 
Recently purchased a yamaha g14 that wouldn't run, just spit and sputtered. After messing with it for awhile I found the cart has been swapped with a j38 engine. I have the g14 ignitor, it has the correct ignition coil, but has the j38 flywheel that I know won't work with the g14 ignition. After looking at the pulsar coil its for a g2 and has been spliced for the g14 connection. Does this need to be replaced or will it work? Can't find a g14 pulsar anywhere. Thanks


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