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questions about building a racer-for the street

CYP77 - Police | Race Bikes | Choppers, Bobbers and Mods
allthumbs
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Joined: Tue May 06, 2008 7:33 am
Location: Beacon, NY

questions about building a racer-for the street

Post by allthumbs » Mon May 19, 2008 12:24 pm

You guys seem to know all so I'll just go ahead and ask, hoping to get a few opinions.

I plan on rebuilding a cb77 motor with the megacycle cams, valve springs and rockers.

-If I do so is it wasted if I do not overbore for pistons as well, could I just use 2 or 3 over standard?

-will this cam change alone require clutch improvements or will the stock one handle it?

-will I need to add racing valves as well as springs? or can I get the stock type valves ground and seated?

This is my first build so I think this is a good place to start. Any opinions appreciated?

David

kustommusic
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Joined: Sat Sep 11, 2004 6:44 pm
Location: Goshen Indiana

Post by kustommusic » Mon May 19, 2008 8:00 pm

All, Just my 2cents worth here, Don't waste your time or money on those modifications. And I'm all about making things go faster but not the 305. It just isn't worth the trouble. About all you acomplish is making an otherwise good running and fairly reliable engine not. Any power gains you get will be practicly negligable(did I spell that right?). This subject has been talked about some before and the guys that have been there -done that will tell ya. Unless you go all the way with big time mods and an equal check book, you won't even notice the difference except it will be harder to start! But hey its your bike, you define whats fun. Good Luck! Kustommusic

kustommusic
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Joined: Sat Sep 11, 2004 6:44 pm
Location: Goshen Indiana

A racer for the street

Post by kustommusic » Mon May 19, 2008 8:03 pm

I should mention I'm also building a cafe racer from a CB77 the only mechanical changes I'm making is the sprocket size. The rest will be cosmetic. I just hate working on a bike on the side of the road after dark!! Kustommusic

allthumbs
honda305.com Member
Posts: 131
Joined: Tue May 06, 2008 7:33 am
Location: Beacon, NY

Post by allthumbs » Mon May 19, 2008 8:12 pm

well alright, thanks for the tip. You see, this is why I ask my stupid questions because there is someone out there who makes sense.

I'm curious what sprocket you are changing and to what, and how this will benefit the bike? If you feel like sharing the details of course.

care to share some pics?


Thanks much

David

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davomoto
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Joined: Sat Nov 18, 2006 7:36 pm
Location: Marin County CA

Post by davomoto » Mon May 19, 2008 8:28 pm

David, I'm gonna have to agree with Kustom on this one. You'll just spend a lot of money making a reliable old bike, not so reliable. I have my cafe on the road, altough not totally finished. Engine is bone stock with the exception od .50 over Wiseco pistons. these are avaible from classic honda restoration. All of my mods were designed to save weight, and increase performance that way. Shouldered alloy rims, shaved frame, battery eliminator, no electric starter, battery eliminator, 520 chain and sprockets etc. here's a link to some pics of it. Mines the red and black one.

davomoto

http://www.honda305.com/forums/viewtopic.php?t=2135

allthumbs
honda305.com Member
Posts: 131
Joined: Tue May 06, 2008 7:33 am
Location: Beacon, NY

Post by allthumbs » Mon May 19, 2008 8:52 pm

Davemoto,
I know, your bike is sweet, I've been reading your threads on it. thanks for all the great info.

forgive me though, battery eliminator? how cool is that? can you travel far? Eh???

Phil-UK
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Posts: 229
Joined: Thu Oct 19, 2006 7:04 am
Location: ENGLAND

Post by Phil-UK » Tue May 20, 2008 7:57 am

Hi David,

Again, just an opinion.
Friend of mine ( who worked at Honda UK for @20yrs ) had been running a CB77 with a 350cc conversion and standard CB350K pistons and was very impressed with the performance.
No changes required in jetting etc., and geared it up a lot., cams etc., all standard.
Said it had a lot more torque and didn't notice any downsides apart from the initial cost of the big-bore kit ( this is a modern version not NOS Webco or Read-Titan ).
The only proviso is he didn't have thousands of miles on it as a lorry decided to nudge it and broke the l/h cases ( no injuries ) but its being rebuilt this year.

All that said, if you have good 305 barrels and pistons why not try that first and if you feel you need
more go then you can investigate this sort of option.
If you have all the engine bits you could spend the cash on the cycle parts .. nice race fairing or
a naked CR93 styled bike in silver and black ...

cheers

Phil

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