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Author Topic: HolmenTree Bikesaw Resurrection  (Read 6145 times)

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Offline dpjones

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Re: HolmenTree Bikesaw Resurrection
« Reply #170 on: September 26, 2019, 10:03:38 pm »
I was just wondering, I'm in NW Ga. and hot is right, hot and dry, been setting some records here.
Thanks
DJ
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #171 on: September 27, 2019, 08:16:57 am »
Some more part finds on Amazon of interest... M5  M6 titanium bolts used for the bicycle mountain bike market.
So much to choose from and I'm not even checking out aircraft quality yet.
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #172 on: September 27, 2019, 08:29:33 am »
Found these aircraft grade M6 titanium bolts to replace the Yamaha's crankcase bolts. Also these bolt nuts will find a use in the build.
5 times stronger and half the weight of steel.
Easily shows why the racing industry is using this stuff
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #173 on: September 27, 2019, 08:58:29 am »
Real learning curve here. Not all titanium bolts are the same. These aerospace grade titanium bolts are grade 6.
These M6 button heads (but in longer thread) will bolt the PTO carbon fiber side plate to the crankcase.

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Offline 3000 FPS

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Re: HolmenTree Bikesaw Resurrection
« Reply #174 on: September 27, 2019, 10:20:43 am »
That is some cool stuff there.    I did not know these bolts were available on line.
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #175 on: September 27, 2019, 10:31:18 am »
Quote from: 3000 FPS on September 27, 2019, 10:20:43 am
That is some cool stuff there.    I did not know these bolts were available on line.
There's an endless amount of different design product. Alot of it is used on the new Boeing 787 for example and the beauty about Amazon is you can order only 4 pieces if you want.
Then there's the aluminum 7075 bolt and fasteners market which are even much more lighter in weight if strength is not an issue.
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #176 on: October 05, 2019, 07:40:59 pm »
Quote from: HolmenTree on September 27, 2019, 08:29:33 am
Found these aircraft grade M6 titanium bolts to replace the Yamaha's crankcase bolts. Also these bolt nuts will find a use in the build.
5 times stronger and half the weight of steel.
Easily shows why the racing industry is using this stuff

So I need to clarify my comment of "5X stronger then steel and half the weight."
That's "strength to weight ratio". Just like the old saying of spider silk being stronger then steel per say.

But as I look at my bike engine's cylinder and head's huge 9 carbon steel studs and nuts that only require  18 and 25 ft. lbs of torque, I see no reason not to replace them with titanium.

In order to get this powerhead safely down to the weight of a Husqvarna 3120XP every gram every ounce adds up.
Prime example is of the earliest Stihl 064AV, to get to the weight of a modern day MS460 Stihl threw every trick into it including little 4mm cover screws.

I got all winter to get this little bikesaw to where I want it at the best power to weight ratio along with compactness.
It's sure alot nicer on this third rebuild in my heated well setup little shop.
The garden shed in the trailer court and the 9th floor apartment broom closet are far but fond memories. Lol...
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #177 on: October 06, 2019, 11:11:51 pm »
Quote from: HolmenTree on October 05, 2019, 07:40:59 pm
Quote from: HolmenTree on September 27, 2019, 08:29:33 am
Found these aircraft grade M6 titanium bolts to replace the Yamaha's crankcase bolts. Also these bolt nuts will find a use in the build.
5 times stronger and half the weight of steel.
Easily shows why the racing industry is using this stuff

So I need to clarify my comment of "5X stronger then steel and half the weight."
That's "strength to weight ratio". Just like the old saying of spider silk being stronger then steel per say.

But as I look at my bike engine's cylinder and head's huge 9 carbon steel studs and nuts that only require  18 and 25 ft. lbs of torque, I see no reason not to replace them with titanium.

So I need to "re clarify" my last post, again.Lol.
I'm replacing over 50 bolts, studs and nuts on the YZ125 engine as I'm getting my titanium order ready to a racing supply company.

This company also makes titanium wheels studs and lug nuts for very high horse power car companies Ferrari,  Lamborghini,  Mercedes, Porsche etc. Half the weight and stronger then the steel studs and nuts it's replacing.
The same grade 5 6AL4V titanium  product I'm buying.

Honda Race teams also run alot of titanium on their race bikes including cylinder base studs and cylinder head studs with nuts, exhaust  flange studs.....
Stuff is not that expensive either and can be bought in small batches or by the piece.
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #178 on: October 08, 2019, 08:59:52 am »
Took me a whole day yesterday to complete my titanium order through Amazon with 2 suppliers.
Order cost me C$70, shipping was free.
Only pieces I'm still looking for is four M10x60 lower cylinder base studs and nuts.

If you buy titanium be aware there's lots of junk out there. If it's not 6AL 4V grade 5 don't buy it.
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #179 on: October 08, 2019, 12:07:51 pm »
Amazon and Ebay are way to easy to spend your money.
But wow some good deals . I just ordered a NOS standard bore piston for my 1982 YZ engine. Not a scratch on it and the box still looks brand new. $7 USD plus $17 for shipping.
Tons of NOS STD vintage pistons on Ebay some as high as $120. Got mine out of Spokane, Wa.
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