Cafe Racer Forum banner

1 - 8 of 8 Posts

·
Registered
Joined
·
2,595 Posts
Discussion Starter #1
Who does cylinder head work on all these wee little Honda's? I need to go through an S90 cylinder head... basic valve job, check guides etc., but it's too small for my local machine shop. I'd rather keep it in N.E. versus sending it out to Cali.
Actually, my local shop modified the arbor on their cylinder boring machine just to fit inside the S90 cylinder for me, which was real nice, but they can't grind these valve seats.

FR
 

·
Super Moderator
Joined
·
11,267 Posts
Is your local machine shop a "bike shop". Most regular machine shops don't have small enough tooling for small bikes. A lot of bike shops should have it...although dealers usually SUCK for this kind of work.

I know Powroll out on the west coast specializes in the small stuff. They did some extensive work a 70cc head for me...they are stupid expensive for stuff like porting and oversize valves though. I'm not sure if they even do basic work.

Gotta be someone in the NE doing it with small bore dirt and motard racing being all the rage these days.

Take the plunge...have the ports cleaned up a bit while your at it, get the intake matched to the insulator/manifold. I've got an old Honda factory (HRC) race manual for the S90...course it specs a bunch of totally unavailable NOS race parts.

The S90 will go pretty freaking good I hear, with the right mods.
JohnnyB
 

·
Registered
Joined
·
2,595 Posts
Discussion Starter #3
Forget the local dealers. The machine shop I speak of is The Crank Shop, of snowmobile hotrod fame, right here in Essex Junction. But they really do 2 stroke stuff.
I'll keep on looking though...got all winter to do it.

Don't know what the S90s capable of, pretty pedestrian components. It's a time machine to ride though, you'd swear you rode it right out of one of the old Cycle magazine ads.

FR
 

·
Super Moderator
Joined
·
11,267 Posts
Sounds like you might want to get that puppy street legal and run it in our 2005 MotoGiro USA! You'd go into the 125cc class..talk about huge fun.
JohnnyB
 

·
Registered
Joined
·
13,809 Posts
i have a guy in north carolina, which i know isnt new england. ive been trying to dig up his contact info. if you dont want it, let me know.

jc
 

·
Registered
Joined
·
2,595 Posts
Discussion Starter #6
JohnnyB;
That puppy is registered and insured. My son rode it to school and work for about a month, till it died. It was my fault it died too, we had just eliminated the stock airbox, 'cause we wanted to run this really cool looking Moroso air filter I found, but I didn't rejet the carb. It was fine till we added a straight pipe racing exhaust. The piston rings welded themselves to the cylinder on the exhaust side. So now it's time to do it right. Damn, I hate to admit that.

Funny thing about the insurance, Progressive actually owed me money when I added the S90. I already had two bikes on, adding the third brought the rates down enough to more than cover liability on the '65 S90.

Yeah I'm interested in the Motogiro deal. Will they let a '75 CB125 sneak in too? I promise it'll turn heads...

JC;
At least it's east coast, so yeah, let me know if you find it. Thanks

FR
 

·
Super Moderator
Joined
·
11,267 Posts
FR,
The cut off date for the MotoGiro is 1969... the S90 is good no matter what cause they were made way back...there is a "like or similar rule" sort of thing.

You really ought to consider it...the smaller the bike the more fun it is really. I'll be on a 1965 CB160 and my wife on a 67 Sears 106.

The hero last year was a guy that did it on a Sears 50cc.

And hey...your son had to be twisting the wick pretty good to seize like that. I've built honda singles for racing for a while now and they will handle a lot of abuse and maladjustment before they give up. Typically if they are rich enough to even run they won't seize without sustained wide open running. Don't let him blame it on you :)
JohnnyB
 
1 - 8 of 8 Posts
Top