[Rockey1978]

Hey I am wondering if it is a good idea to bore out my 350. It has 17k on it and looks great inside. I am not too sure what these motors can handle. I would need to know what I need to do to the top end as well as the bottom end. Or if anyone out there has a set of pistons for this bike I need some. e-mail me at [email protected] or post it here. Thanks. I will take all of the information that I can get.

 

[snorkelfork]

these bikes can handle more than you are likely to want to spend getting it there, but before anyone starts in on that how about you post some photo's, history, give us an idea of what you know and what your plans are for this bike.

if you are going to bore it as a performance enhancement this is the site you want.
http://home.earthlink.net/~toddhenningracing/index.html


get the shop manual here
ftp://manuals.homeftp.net/Manuals/Honda/Honda CB,CL,SL 250-350

and when you post the picts you have to use lower case ('s) or it won't post.

...connoisseur of slack...

 

[Rockey1978]

i have a basic knowledge of motors and rebuilding them. I have rebuild two civic motors and currently drive one of the cars daily. But that is a car. I have never rebuild a motorcycle motor. not too much different other than size. I was just unsure of the tolerance these motors could handle. Also given the age of the bike and the mileage I am unsure of what to expect. I have a manual on its way already, and have torn down the motor. I am going to start cleaning off all of the dirt and crap from the engine and frame. I am just looking to gather all of the information that I can about this bike and where I can go with it.

 

[Rockey1978]

 

[joe c]

i kinda think it depends on what you want to do with it. if youre going to ride it, bore it with the biggest pistons you can get from honda. dont bother just going .025 over. (go 1mm over) you can still get em from honda, or watch ebay. i buy all my pistons on ebay. rings too. waay cheaper than honda. pistons will run you 60 each and rings will run you about 20 each from the dealer. you can buy the whole kit for about or less than 100 bucks on ebay. the cyls are easy to get, so dont worry about going too big. jugs are a dime a dozen. a standard valve job should do wonders. get a radiused type if you can find someone to do it. new springs, help usually. but you can check them to be sure they are in spec. (the book will cover it). if youre going to race...depends on what class and which club. you can go crazy and spend thousands on a race motor easily. the bottom ends hardly ever fail. get a slipper type chain tensioner.

jc

 

[krapfever]

If you are shopping for an overbore kit, try to find one branded ART. Others are out there (Hap Jones, Tucker Rocky, etc.) but I've heard ART's are the best.

The kit should come with rings, wrist pins and keepers.



Honda go sideways!

 

[joe c]

art is what youd get from honda. most pistons come with pins and clips. from honda, you have to order the rings seperately as you can just put in rings. so they are seperate. if you buy a kit form tucker of someother place, they will most likely come with the extra bits. id buy a hap jones setup if i could.

jc

 

[Rockey1978]

I am not looking to race the bike, however I am looking to make a radical custom out of it. I do want it to run strong and sound mean. i started cleaning it tonite and the motor looks great. I can't wait to start ordering parts for it. Oh by the way I have no idea how to post a picture on here.

 

[Rockey1978]

Also i was wondering what I would need to have done to the head other than valves and springs if anything at all.

 

[joe c]

just throw stock pistons in it. itll be reliable, and you wont have to replace them every year. go 1mm over, with some oem pistons. (arts) you can run mikunis on it if you want it to run a little better. also a 1mm bigger intake valve. then some megs...youll sound plenty mean. you could even run a mild cam or look for the early fat cam and followers. thatd be about as cool trick as you can get while still staying pretty stock and reliable. the bigger you build them the more difficult it can be to build and less friendly for the street, and for someone who doesnt know what they are doing.

work mostly on shaving weight, and excess junk. they can look real cool with alot of crap moved or removed.

jc

 

[Rockey1978]

Hey, What do you reccomend as a good gasket sealer. I just purchased a gasket kit and the pistons are on the way. All I need now is to hone the cylinders and the motor will be on its way.

 

[xander450]

yamabond.

 

[texmawby]

xander,

yamabond on a cb350 honda is sacrilege and will only anger the gods.....

try hondabond!

texy

 

[Rockey1978]

Is there such a thing as hondabond?

 

[krapfever]

Its a "special" kind of friendship.

Or, this stuff:

http://www.hondapartsworld.com/index.asp?PageAction=VIEWPROD&ProdID=4321

Honda go sideways!

 

[Rockey1978]

I am thinking of switching from drum brakes to disc. any idea of where to get a good kit. Is this a good idea or will the drums hold up. I am only familiar with disc style brakes. This bike is the oldest machine I own and the other ones have disc brakes. Should I convert and where do I go. Thnaks

 

[Rockey1978]

I am thinking of switching from drum brakes to disc. any idea of where to get a good kit. Is this a good idea or will the drums hold up. I am only familiar with disc style brakes. This bike is the oldest machine I own and the other ones have disc brakes. Should I convert and where do I go. Thnaks

 

[borzwazie]

only if the drums aren't stopping you.

seriously, doing this can be a very large pain in the ass. besides, polished drum brakes look trick.

*******************************************************
My CB450 project:
http://www.caferacer.net/forum/topic.asp?TOPIC_ID=2827
*******************************************************

 

[borzwazie]

only if the drums aren't stopping you.

seriously, doing this can be a very large pain in the ass. besides, polished drum brakes look trick.

*******************************************************
My CB450 project:
http://www.caferacer.net/forum/topic.asp?TOPIC_ID=2827
*******************************************************

 

[Rockey1978]

Would you run a front brake or not. I was thinking of only running a rear brake. I am sure I wont be going that fast, and if the rear brake will stop me just fine then I will rin a drum on the rear. Thanks