850 Big Bore

Landmonster · Full Member Joined: Mar 11, 2009 Posts: 13

Does anyone know if the 850 kits are available anywhere? Or is 850 maybe a bit too much for the xs?

xs1961 · Posted: March 12, 2009, 5:40 pm Post subject: Re: 850 Big Bore

You'll have to source the parts yourself these days, I dont know of anyone in the UK at least who takes them on. . Ive owned & built a few over the years but usually bought the details such as off-set dowels , head gaskets etc from Tony Hall (Halco, address; heaven) ..
Easy enough to buy the SP370 pistons & machine the crankcases & modify the camchain tensioner yourself , plenty of companys out there who will supply the 85mm liners( for a price !)
I gave up on them because I couldnt buy the head gasket anymore, they seemed to blow every couple of years
they run hot too, not only because of the increased combustion but mainly due to the fact you lose the airflow between the cylinders as the oversize liners almost breach the camchain tunnel.
Better off with Mikes 750 kit these days.. Thats what Im saving for..
BTW, you'll need a 533 crank for the 840 conversion..

yamaman · Posted: March 12, 2009, 8:33 pm Post subject: Re: 850 Big Bore

Everything you need to go to 840cc here, 533 or 447 motors. Purpose built pistons, not cut down from something else!
These are STILL on special, don't forget to convert from Aussie$ to your currency, the AU$ is quite low at the mo!:

www.users.bigpond.net.au/dave650/

tacoswild · Posted: March 12, 2009, 9:27 pm Post subject: Re: 850 Big Bore

You guys are crazy. In a good way. but still crazy.

xs1961 · Posted: March 13, 2009, 4:08 am Post subject: Re: 850 Big Bore

Good to know the Auzzies are keeping them going..
Bloody expensive once youve paid the taxes/customs though..

metalredneck · Full Member Joined: Aug 04, 2008 Posts: 308

Christ onna crutch! The land of Mad Max strikes again!

xsjohn · Posted: March 13, 2009, 9:47 am Post subject: Re: 850 Big Bore

For street use hoping them up really depends on how far you want to get down the road and how pleasantly you can get where you are going......after being trained at Yamaha and 40 years with Yamahas what could I possibly know ..................

First impulse is to hop them up or wack them up.....sometimes things can quickly get worse than before such hasty and often expensive decisions were made.........

Trying to make a Corvette out of a VW usually turns south..........only seems reasonable to me to buy a bigger bike for the speed....then there would be 2 bikes in the garage and maybe some money in the bank too.....

xsjohn

tacoswild · Posted: March 13, 2009, 11:41 am Post subject: Re: 850 Big Bore

they're big boys john, surely they know it's not the most sensible idea in the world but sometimes a man's gotta do what a man's gotta do. Hell it makes more sense than this:
thekneeslider.com/arch...otorcycle/

or this:

thekneeslider.com/arch...otorcycle/

metalredneck · Full Member Joined: Aug 04, 2008 Posts: 308

I agree. I spent thousands of dollars and hundreds of hours hot-rodding my '84, and it kept blowing up large. The front wheel would hop an inch off the ground at idle. Then I bought an '84 Interceptor 1000 for $2000.00, and learned what speed & smoothness were all about.

That said, I do love my current TX. It suits who I am now.

xsjohn · Posted: March 13, 2009, 12:01 pm Post subject: Re: 850 Big Bore

If I can't make a point on what seems reasonable then I guess I am waisting my time...........on this site if you pointed a finger up and said "that is up"....someone would come back and say "not in if you were in China"..... Laughing

xsjohn

Retiredgentleman · Posted: March 13, 2009, 12:21 pm Post subject: Re: 850 Big Bore

Not sure about the US, but in Canada a single finger pointed up would be considered a rude gesture, but commonly seen in downtown traffic Smile

xsjohn · Posted: March 13, 2009, 12:50 pm Post subject: Re: 850 Big Bore

That's just the point I was trying to make.......but did forget about that finger though..... Laughing

xsjohn

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