Help G8

bigred_262002 · 04-23-2012, 09:17 PM

Hi guys. I now have my G8 up and running. The motor has been rebuilt. New seals, New rings, New intake (old one was cracked) now that is back together an I ran it this weekend I’m finding a problem I had never seen before. It doesn’t seem to have the power it should. I have to pull the choke out and it runs better. I put a larger jet in it and it seems to help but not by much. I also hear a popping sound in the muffler. Is it possible that the valves out of adjustment an letting fuel in and that’s why the popping? That would want it to need more fuel. When I had the head off I had a guy reseat the valves and he said there was no need to adjust them. But I’m thinking there is.

CajunLoneWolf · 04-23-2012, 09:35 PM

Yep I would check the valves again. They can be kinda tricky to get just right. Also check your carb and make sure that the throttle cable is letting it close all the way. That could also be a reason for the popping.

bigred_262002 · 04-23-2012, 09:40 PM

I didn't think about that. but that wouldn't cut the power back would it?

CajunLoneWolf · 04-24-2012, 05:31 AM

I would say no.... But these Yamahas are very finicky about the fuel air mixture so it wouldnt suprise me at all.

G1-G9 · 04-24-2012, 08:42 AM

Make sure your air box is sealed up tight or you will lack for power.

bigred_262002 · 04-24-2012, 08:48 AM

Its tight. Well as tight as its always been. It's always been. The clips are on it. Is there a way to test the air box to see? I was thinking like blocking off the in let to the air box or spaying starting fluid around the seems to see if it gains RPMs. That should tell me.

G1-G9 · 04-24-2012, 09:13 AM

I know until i got my air box sealed up tight it didnt have any power.

bigred_262002 · 04-24-2012, 09:17 AM

But did it now an then make a popping sound in the muffler like something was loose or it back firing?

04-23-2012, 09:17 PM	#1
bigred_262002 Getting Wild Join Date: Sep 2011 Location: Fairfield Ohio Posts: 81	Help G8 Hi guys. I now have my G8 up and running. The motor has been rebuilt. New seals, New rings, New intake (old one was cracked) now that is back together an I ran it this weekend I’m finding a problem I had never seen before. It doesn’t seem to have the power it should. I have to pull the choke out and it runs better. I put a larger jet in it and it seems to help but not by much. I also hear a popping sound in the muffler. Is it possible that the valves out of adjustment an letting fuel in and that’s why the popping? That would want it to need more fuel. When I had the head off I had a guy reseat the valves and he said there was no need to adjust them. But I’m thinking there is.

04-23-2012, 09:35 PM	#2
CajunLoneWolf The Pro in procrastinate! Join Date: Apr 2011 Location: Scott, La Posts: 2,086	Re: Help G8 Yep I would check the valves again. They can be kinda tricky to get just right. Also check your carb and make sure that the throttle cable is letting it close all the way. That could also be a reason for the popping.

04-23-2012, 09:40 PM	#3
bigred_262002 Getting Wild Join Date: Sep 2011 Location: Fairfield Ohio Posts: 81	Re: Help G8 I didn't think about that. but that wouldn't cut the power back would it?

04-24-2012, 05:31 AM	#4
CajunLoneWolf The Pro in procrastinate! Join Date: Apr 2011 Location: Scott, La Posts: 2,086	Re: Help G8 I would say no.... But these Yamahas are very finicky about the fuel air mixture so it wouldnt suprise me at all.

04-24-2012, 08:42 AM	#5
G1-G9 LIFE IS TAKING FOREVER Join Date: Apr 2010 Location: DANSVILLE NY Posts: 5,327	Re: Help G8 Make sure your air box is sealed up tight or you will lack for power.

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04-24-2012, 08:48 AM	#6
bigred_262002 Getting Wild Join Date: Sep 2011 Location: Fairfield Ohio Posts: 81	Re: Help G8 Its tight. Well as tight as its always been. It's always been. The clips are on it. Is there a way to test the air box to see? I was thinking like blocking off the in let to the air box or spaying starting fluid around the seems to see if it gains RPMs. That should tell me.

04-24-2012, 09:13 AM	#7
G1-G9 LIFE IS TAKING FOREVER Join Date: Apr 2010 Location: DANSVILLE NY Posts: 5,327	Re: Help G8 I know until i got my air box sealed up tight it didnt have any power.

04-24-2012, 09:17 AM	#8
bigred_262002 Getting Wild Join Date: Sep 2011 Location: Fairfield Ohio Posts: 81	Re: Help G8 But did it now an then make a popping sound in the muffler like something was loose or it back firing?