porting?

ou812 · Post by **ou812** » August 4th, 2007, 8:32 pm

O.K. so I picked up a extra barrel for my general use 2001, I've always used a local guy in the past but want to try someone else just to test out the differants. So you guy's on the west coast side in the lower 48, can ya give me a coulpe of names of first rate places to get my barrel bored and ported. I Don't want a hill climb/ sand drag motor, I'm looking for a good all round general use motor. I don't do slow single track stuff so a good strong mid is more to my liking.

iggys-amsoil · Post by **iggys-amsoil** » August 4th, 2007, 11:07 pm

Well there are others besides a quad place,

to do port work. At the time the only place I knew who has experiance with 500 motors, namely Suzukis LT500 quad was Trinityracing. You won't find anything about porting a 500 on there website. But if you do send it, tell them (Harry the Owner) Steve with Amsoil sent ya.

Its a mild port job and I'm happy with it. Had to richen the needle two sizes to keep the lean pinging away. As long as I don't muff the start at a sand drag and the gearing is near the same I can usually walk away from a stock motor.

I just had the top redone after three years by them who ported and bored it back then. Asked for 3.5 thou clearance and got it. BTW no oil holes are drilled in the Wiseco piston either.

bigpower · Post by **bigpower** » August 5th, 2007, 9:38 am

Leave it stock and gear it. For sure 15 up front, 47/48 out back.
You'll be surprised and dollars ahead. Just my opinion.

I had Gorr do my '98 some time back, the "coveted" "Mo Betta Everywhere", and it's real strong everywhere. I do the singletrack, but it's not so slow. I rode a '95, all stock except pipe, with 15/45 gearing that I really liked.
www.eric-gorr.com

Dunno, guess you can never know til ya try it. We've got a new addition coming into the family this week, an '01, that is gonna stay stock and be my new rider. Jr's getting the niner.

Ported&Polished · Post by **Ported&Polished** » August 5th, 2007, 10:46 am

Porting in stages is weird to me. It's either ported or it's not. Hog that sucker out, get a pipe, run some race gas, and flog it. I won't suggest my porting dude because everyone thinks their guy is the man, so just find someone who has done it for a long long time.

britincali · Post by **britincali** » August 5th, 2007, 11:16 am

I spent probalbly 4 hrs on mine going gently with an air die grinder and a burr tip, I port matched the exhaust to the flange cleaned up the intake, knife edged the bridge, chamfered the ports and cleaned up the transfers. I dint change the port timing whatsoever and it runs about the same as the eric gorr port job on my steelie.

IMO the exhaust is the worst part of the casting I was able to remove a good 3-4 MM of material just to get it smooth on the transition to the manifold.

ou812 · Post by **ou812** » August 6th, 2007, 8:57 pm

Ya, I've got a 87 motor in my 00 stealie it is like Brit discribed and it rips along pretty good. My 01 stealie is super low time (about 3 hrs) and i've got it jetted spot on but it just is plain boring, almost 4 banger like. I could go the same route on the barrel I got for the 01 but I kinda wanted to see if some extra good port guy can give me something the is better then the " mo better " stuff. But without the drag style in your face all or nothing kind of power.

bigpower · Post by **bigpower** » August 8th, 2007, 4:24 pm

ou812 wrote:Ya, I've got a 87 motor in my 00 stealie it is like Brit discribed and it rips along pretty good. My 01 stealie is super low time (about 3 hrs) and i've got it jetted spot on but it just is plain boring, almost 4 banger like. I could go the same route on the barrel I got for the 01 but I kinda wanted to see if some extra good port guy can give me something the is better then the " mo better " stuff. But without the drag style in your face all or nothing kind of power.

You're askin for the moon.

ou812 · Post by **ou812** » August 8th, 2007, 7:06 pm

You're askin for the moon.

Yes but thats all part of being old and dumb

bigpower · Post by **bigpower** » August 9th, 2007, 3:45 pm

ou812 wrote:
You're askin for the moon.
Yes but thats all part of being old and dumb

Well, you can work with dumb.

Seriously though, a Mo Betta might be right up yer alley. The mid and top are about as good as it gets without being confined to just one end or the other of the spectrum. The narrowing of the rear transfer ports smooths out the power delivery on the bottom, and the work done to the exhaust port completes the package. Think its widened by 4mm and raised 1.5mm.
As in, once it starts to get into the lower part of the midrange, you better hang on, cause it'll get to the top in a damn hurry. Racing fuel is not required, but it seems to run best on a 2 to 1 mix of 93 pump and 110 race fuel, about 98.5 octane. I'd avoid a RAD valve, unless you don't mind putting 2-3 sets of reeds in/yr. They just dont seem to last in the CR(my experience)
My set up with the porting
.020 over, clearance at .0032(a loose 3)
Wiseco piston
39.5 PWK running 45 pilot, 168 main, DGN needle, airscrew at about 3/4 turn, depending on temp at an average altitude of 1400'
STOCK! reeds

PC pipe/FMF Turbine Core SA
Steahly 13 oz flywheel weight(Really made a difference thru the tight stuff)
15/48 gearing

Hey, alot of guys have thrown some shit at Gorr in the not so distant past, but he does good work. Send it to him, and wait. If you don't bother him, less chance he'll turn into an erect Richard, not that he would anyway. You'll need to send him the cylinder and exhaust manifold. Forget what the price was offhand, but I think you'll get the whole shot, including piston and gaskets, for around $350USD shipped.

Post by **MojoScojo** » August 10th, 2007, 6:55 am

I'll second what BigPower said. I also have the Mo Betta.

I really like the power delivery on mine. I had some material removed from the head on mine so I could get away with pump gas. If I feel like it, I have a stock head to throw back on it. With the stock head and some good gas, the thing just breathes fire. Wow.

I'm a clutch abusing singletracker by the way, but this motor works well no matter what I'm doing.

ou812 · Post by **ou812** » August 10th, 2007, 12:50 pm

Ya I saw your pics, thats what I've been riding lattly, with lots of steep washed out creeks ect.

So O.K. I'll give the Mo Better a go, I'll give ya some feedback once it's on, but my current top end is fine so I won't be installing the other barrel until the end of this season

ou812 · Post by **ou812** » August 14th, 2007, 6:32 pm

Is appears Mr. Gorr does not answer the phone or answer email, gee maybe all the flaming he has gotten is true.

Post by **MojoScojo** » August 14th, 2007, 8:44 pm

I just had a YZ80 done by him. It will take a few days, but he'll answer his email and give you an address to send the stuff. If you're in a hurry, he's not your man.

bigpower · Post by **bigpower** » August 14th, 2007, 9:34 pm

MojoScojo wrote:I just had a YZ80 done by him. It will take a few days, but he'll answer his email and give you an address to send the stuff. If you're in a hurry, he's not your man.

Patience Grasshopper!

The Mojo speak the truth.

He's been thru a couple relocations in the recent past, but you'll be taken care of. Business is a little different these days, but the quality of the job will be second to none

ou812 · Post by **ou812** » August 14th, 2007, 11:15 pm

I've sent 2 emails, one last week and one this week, well I'll wait them. Not that I'm in a hurry but I just need to know if I should send a piston with the barrel as it does need a first over.

britincali · Post by **britincali** » August 14th, 2007, 11:29 pm

He keeps everything needed in stock, I just sent my barrel and head. Came back with a pre-drilled piston and gapped rings.

BannedCR500Riders.com

porting?

porting?