Top end needs rebuilding - Yamaha Grizzly Forum : GrizzlyOwners.Com Yamaha Grizzly Forums

jerrydavis · 07-27-2009, 01:41 PM

My engine is smoking really bad. I am going to rebuild the top end and could use some advice. Should I go with OEM 1mm over std or since I will be in the engine, go ahead with the 2mm over std (686)? I know that the pros of 686 is more power but do not know all of the cons. I will be adding a mudbuster cam during this rebuild. Thanks in advance for all the help you guys and gals allways give.

rbdenman · 07-27-2009, 02:12 PM

Wow, JJ! This'll start a TON of debating here... Since you're in there, I'd do up a 686cc motor. I'd stay with a 10:1 compression ratio slug so that fuel quality never is an issue. Jasson keeps telling everybody that the Raptor cam might be a better choice, and he has put some dyno numbers in another thread as evidence... Basically the Mudbuster cam gives about 1.5hp more on the bottom-end, they're about even through midrange, and then the Raptor bumpstick is 4hp stronger on top...

But that's just my ignorant opinion...[img]/CFIDE/scripts/ajax/FCKeditor/editor/images/smiley/msn/confused_smile.gif[/img].

**gunny** · 07-28-2009, 10:16 AM

jj450 .... great timing .... as I might do the same work on my Grizz in a month or so .... but to answer yer question ... I'd go the 686 kit. The cam thing is up to you .... but I picked up a Raptor cam at a pretty good price, so that's the once I'm putt'in in. Along with Raptor cam springs.

Take photo's & let us know what ya run into & how the work goes & then yer riding impressions. I know that's my plan too !!

Later ...

jerrydavis · 07-28-2009, 11:43 AM

Thanks guys, I already have a raptor cam just need to get the springs. I guess I will also go with the 686 in order to keep up with Gunny.

**gunny** · 07-28-2009, 01:56 PM

JJ .... listen .... I'm so far ahead .... I think I'm in last place ..... LMAO !!!! ...... and don't worry about keep'in up .... we'll just ride side by side .......... & spray Bob with mud water as he rides behind us !!! ........... ROTFLMAO !!! ............. Oh, Hi Bob !!!! ........... WHAT ?? .......... Yes, that was mean of me .............. Ah ............ I should feel bad ?? ............. Now yer jok'in ....... right ??!!

Later .....

bigmac · 07-28-2009, 09:40 PM

I'm in the process of rebuilding the top end on mine. I decided to stay stock. I took the cylinder to work and checked the bore and it was still within specs. I have a Wiseco piston with a wrist pin, clips, rings and a top end gasket kit on order that should be in by the end of the week. I do plan on changing the exhaust, the question is which one?

**gunny** · 07-29-2009, 07:47 AM

Well Bayou Griz 660 ..... what pipe to get ? .... that is kinda of a loaded question ............ but, I'll give my 2-cents worth.

I have a Leo Vince X3 pipe & I really like it. I run the quiet core with the spark arrestor screen & it's has a nice throaty sound ... not too loud at all ... almost stock loud but with a better sound.

I've heard good things about the HMF Swamp series pipe and a forummember named Crankshaft got one of those & he really like it too.

Hammer07 has a Two Brothers pipe I believe ........

So that's 3 pipes &there are a great many out there to choose from. Have fun choos'in.

Later ....

rbdenman · 07-29-2009, 08:17 AM

The fun is in the shopping anyway; right?

(Roostin' on me! I know the shortcuts, and I'll get in front of you!)[img]/CFIDE/scripts/ajax/FCKeditor/editor/images/smiley/msn/angel_smile.gif[/img]

**hammer07** · 07-29-2009, 10:16 AM

i have a Dubach Racing Development (Dr.D) slip on pipe. i like the sound, but it is definitely louder than stock. i have not tried the quiet core for it, but they do have one.
wether it added any power or not? who knows. if it did, it was minimal. but it SOUNDS more powerful! LOL!

jerrydavis · 07-29-2009, 12:17 PM

Here is a picture that shows how bad the bear is smoking. Even smoking was able to pull out buddy's arctic kitty

07-27-2009, 01:41 PM	#1 (permalink)
jerrydavis Senior Member Join Date: May 2007 Location: new caney Posts: 106	Top end needs rebuilding My engine is smoking really bad. I am going to rebuild the top end and could use some advice. Should I go with OEM 1mm over std or since I will be in the engine, go ahead with the 2mm over std (686)? I know that the pros of 686 is more power but do not know all of the cons. I will be adding a mudbuster cam during this rebuild. Thanks in advance for all the help you guys and gals allways give. __________________ 08 Grizzly 660 28" Mudzilla's, Gorilla Stage 1 Lift, Triangle snorkel kit, Billet clutch weights with EPI white spring, Dynatek CDI, Dynojet kit, K&N air filter, 2500lb Warn winch.

07-27-2009, 02:12 PM	#2 (permalink)
rbdenman Senior Member Join Date: Apr 2006 Location: Grahamsville Posts: 7,458	Wow, JJ! This'll start a TON of debating here... Since you're in there, I'd do up a 686cc motor. I'd stay with a 10:1 compression ratio slug so that fuel quality never is an issue. Jasson keeps telling everybody that the Raptor cam might be a better choice, and he has put some dyno numbers in another thread as evidence... Basically the Mudbuster cam gives about 1.5hp more on the bottom-end, they're about even through midrange, and then the Raptor bumpstick is 4hp stronger on top... But that's just my ignorant opinion...[img]/CFIDE/scripts/ajax/FCKeditor/editor/images/smiley/msn/confused_smile.gif[/img]. __________________ SOLD!! 2004 Grizzly: Way too many modifications to try and list them all here...

07-28-2009, 10:16 AM	#3 (permalink)
gunny Moderator Join Date: Mar 2008 Location: Above Sea Level Posts: 4,225	jj450 .... great timing .... as I might do the same work on my Grizz in a month or so .... but to answer yer question ... I'd go the 686 kit. The cam thing is up to you .... but I picked up a Raptor cam at a pretty good price, so that's the once I'm putt'in in. Along with Raptor cam springs. Take photo's & let us know what ya run into & how the work goes & then yer riding impressions. I know that's my plan too !! Later ... __________________ "Work" is a Dirty Four Letter Word !!! My Vids -- http://www.youtube.com/user/GunnyE9

07-28-2009, 11:43 AM	#4 (permalink)
jerrydavis Senior Member Join Date: May 2007 Location: new caney Posts: 106	Thanks guys, I already have a raptor cam just need to get the springs. I guess I will also go with the 686 in order to keep up with Gunny. __________________ 08 Grizzly 660 28" Mudzilla's, Gorilla Stage 1 Lift, Triangle snorkel kit, Billet clutch weights with EPI white spring, Dynatek CDI, Dynojet kit, K&N air filter, 2500lb Warn winch.

07-28-2009, 01:56 PM	#5 (permalink)
gunny Moderator Join Date: Mar 2008 Location: Above Sea Level Posts: 4,225	JJ .... listen .... I'm so far ahead .... I think I'm in last place ..... LMAO !!!! ...... and don't worry about keep'in up .... we'll just ride side by side .......... & spray Bob with mud water as he rides behind us !!! ........... ROTFLMAO !!! ............. Oh, Hi Bob !!!! ........... WHAT ?? .......... Yes, that was mean of me .............. Ah ............ I should feel bad ?? ............. Now yer jok'in ....... right ??!! Later ..... __________________ "Work" is a Dirty Four Letter Word !!! My Vids -- http://www.youtube.com/user/GunnyE9

07-28-2009, 09:40 PM	#6 (permalink)
bigmac Senior Member Join Date: Feb 2005 Location: Port Allen Posts: 152	I'm in the process of rebuilding the top end on mine. I decided to stay stock. I took the cylinder to work and checked the bore and it was still within specs. I have a Wiseco piston with a wrist pin, clips, rings and a top end gasket kit on order that should be in by the end of the week. I do plan on changing the exhaust, the question is which one? __________________ "03" Yamaha Grizzly 660, 27" Mudlites W/ITP "C" Series Rims, Highlfter Skid Plates, J&L Temperature Gage, Warn 2.5 c.i winch, Warn Bumper, Exhaust Power tip, Highlifter heavy duty springs, Dalton Clutch kit, Highlifter Triple Flow Radiator, DynoJet kit, K&N filter with pre-filter "96" Honda FourTrax TRX200d Type II All Stock for now

07-29-2009, 07:47 AM	#7 (permalink)
gunny Moderator Join Date: Mar 2008 Location: Above Sea Level Posts: 4,225	Well Bayou Griz 660 ..... what pipe to get ? .... that is kinda of a loaded question ............ but, I'll give my 2-cents worth. I have a Leo Vince X3 pipe & I really like it. I run the quiet core with the spark arrestor screen & it's has a nice throaty sound ... not too loud at all ... almost stock loud but with a better sound. I've heard good things about the HMF Swamp series pipe and a forummember named Crankshaft got one of those & he really like it too. Hammer07 has a Two Brothers pipe I believe ........ So that's 3 pipes &there are a great many out there to choose from. Have fun choos'in. Later .... __________________ "Work" is a Dirty Four Letter Word !!! My Vids -- http://www.youtube.com/user/GunnyE9

07-29-2009, 08:17 AM	#8 (permalink)
rbdenman Senior Member Join Date: Apr 2006 Location: Grahamsville Posts: 7,458	The fun is in the shopping anyway; right? (Roostin' on me! I know the shortcuts, and I'll get in front of you!)[img]/CFIDE/scripts/ajax/FCKeditor/editor/images/smiley/msn/angel_smile.gif[/img] __________________ SOLD!! 2004 Grizzly: Way too many modifications to try and list them all here...

07-29-2009, 10:16 AM	#9 (permalink)
hammer07 Moderator Join Date: Oct 2008 Location: Marion Center Posts: 2,573	i have a Dubach Racing Development (Dr.D) slip on pipe. i like the sound, but it is definitely louder than stock. i have not tried the quiet core for it, but they do have one. wether it added any power or not? who knows. if it did, it was minimal. but it SOUNDS more powerful! LOL! __________________ "When life's never dull, wear a hull for your skull!" -Phineas Fletcher BLUE ('cause it's the fastest, most powerful color)'07 660 with a whole pile of stuff added! BLUE ('cause it's STILL the fastest, most powerful color)'09 550 w/EPS

07-29-2009, 12:17 PM	#10 (permalink)
jerrydavis Senior Member Join Date: May 2007 Location: new caney Posts: 106	Here is a picture that shows how bad the bear is smoking. Even smoking was able to pull out buddy's arctic kitty __________________ 08 Grizzly 660 28" Mudzilla's, Gorilla Stage 1 Lift, Triangle snorkel kit, Billet clutch weights with EPI white spring, Dynatek CDI, Dynojet kit, K&N air filter, 2500lb Warn winch.