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78 yamaha tt500 tec help please

Reply from: 70'sbikefreek
Date: 19 Sep 2007, 09:16
78 yamaha tt500 tec help please

I am trying to build the old clasic bike up with vintage parts any
thing you might have seen or done in the past to hop this thing up i
would like to know from fork swaps to carb jeting or any thing
inbetwen but still age corect


Reply from: Buteo lineatus
Date: 19 Sep 2007, 15:55
Re: 78 yamaha tt500 tec help please

On Sep 19, 12:16?am, 70'sbikefreek <an1234ll...@hotmail . com > wrote:
> I am trying to build the old clasic bike up with vintage parts any
> thing you might have seen or done in the past to hop this thing up i
> would like to know from fork swaps to carb jeting or any thing
> inbetwen but still age corect

Just do a running restoration on it, leave it stock and ride it on
Sunday morning.

If you really, really, really want more horsepower, buy a 600cc
sportbike which has already been manufactured to produce 100
horsepower at a bazillion RPM.

Souping up a motorcycle engine is a matter of boring it out and
installing oversized pistons, porting the head, maybe installing
larger valves and a wilder camshaft. You'll need a high compression
piston to work with the wilder cam. Then you install a bigger
carburetor that mixes the gas and air better. And the engine will need
a shorter exhaust pipe to work at higher RPM.

Since an engine can only produce more horsepower if it runs at higher
compression, or pumps more air through it by operating at a higher
RPM, the motorcycle will be harder to ride because you need to keep it
buzzing at the higher RPM.

So you need to change the drive sprockets. And, because you're riding
harder, you need better tires mounted on wider rims.

When you're done with all this stuff, the motorcycle doesn't look like
a TT500 any more, it looks like a flat tracker.

Maybe you want to google up some flat track and thumper forums for
ideas.


Reply from: chateau.murray@btinternet . com ,
Date: 19 Sep 2007, 18:18
Re: 78 yamaha tt500 tec help please

On 19 Sep, 15:55, Buteo lineatus <Buteo.linea...@gmail . com > wrote:
> On Sep 19, 12:16?am, 70'sbikefreek <an1234ll...@hotmail . com > wrote:
>
> > I am trying to build the old clasic bike up with vintage parts any
> > thing you might have seen or done in the past to hop this thing up i
> > would like to know from fork swaps to carb jeting or any thing
> > inbetwen but still age corect
>
> Just do a running restoration on it, leave it stock and ride it on
> Sunday morning.
>
> If you really, really, really want more horsepower, buy a 600cc
> sportbike which has already been manufactured to produce 100
> horsepower at a bazillion RPM.
>
<snip the usual bollocks>

I think the Classic Bike article contains everything he needs,
actually. It includes plenty of simple tuning tips, as well as how to
do a simple bolt-on disc front brake conversion - a good mod, as the
TT500's front drum was considered inadequate in the 1970s.

Stick to what you know, which is directing people to parts fiches, and
leave the practical advice to those who know about that.


Reply from: chateau.murray@btinternet . com ,
Date: 19 Sep 2007, 18:11
Re: 78 yamaha tt500 tec help please

On 19 Sep, 09:16, 70'sbikefreek <an1234ll...@hotmail . com > wrote:
> I am trying to build the old clasic bike up with vintage parts any
> thing you might have seen or done in the past to hop this thing up i
> would like to know from fork swaps to carb jeting or any thing
> inbetwen but still age corect

This guide from Classic Bike contains a wealth of tuning improvements
and chassis tips.

* w w w .classicbike.co.uk/pdf/506/197731.pdf


Reply from: Rick Cortese
Date: 19 Sep 2007, 20:30
Re: 78 yamaha tt500 tec help please

70'sbikefreek wrote:
> I am trying to build the old clasic bike up with vintage parts any
> thing you might have seen or done in the past to hop this thing up i
> would like to know from fork swaps to carb jeting or any thing
> inbetwen but still age corect
>

To get specific advice you may want to try trolling the message bases at
* w w w .ahrma.org/

The reason I suggest them is you may want to do a class legal
restoration. There are several things you can do, like after market Foxx
or Simmons forks that may be legal but things you shouldn't do like disc
brakes.

Be prepared for sticker shock on some of this stuff. Used Foxx forks
routinely go for over $2,000. Period correct rear shocks from Works
Performance or Progressive are a bit on steep side too.

* w w w .megacyclecams . com /
is still in business last time I checked and you will spend ~$300 for a
basic cam.

Just my opinion but I spend a lot of time on eBay . com looking for parts.
I do have a few bikes that were built up with cam, kits, or pipes but
even the ones bone stock are a lot of fun. Depending on what is there I
would start out with a period correct restoration with used parts and go
to performance parts if it wasn't a hot enough.

Rick




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