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- Опубликовано: 25 май 2017
- 20170525171411 1
1990's #102 evo sportster 90ci big bore lowerend assembly motor case machining tatro machine
just another bail out job from another shop. they got in over their head and call tatro machine for help.
as you can see this motor had a lot of problems that needed to be corrected or it was going to be coming back to the shop very soon. previous bad machining needed to be corrected. after all the fitments were checked and corrected the 1st shop was going to assemble the motor and bike.
this motor is 90ci with axtell 3-13/16" + .060 big bore cylinders with the stock 3-13/16" stroke crankshaft.
tatro 
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Hi Tatro, I just wanted to say thank you for posting all your videos. I really enjoy watching and learning. I have a 1970 ironhead as well as a 83 ironhead and a 96 1200 custom. They’re all temperamental at times and the 1970 I had to completely rebuild. your videos helped me many times along the way. Have a great evening.
Good job Mr. Tatro. I understand Fred has other jobs to do but he is a good Camera guy.
nice to see some one filing the right way for a change
it must have been a mistake. i will do better next time.
tatro
How long does one of these motors last? It just seems like the cases and cylinders are being hacked up to make everything fit. Unless I'm racing it, I don't see the point.
if built correctly these things can last a very long time. if not, than they will not last either. the same goes for stock motors to.
tatro
Nice new red vice! You're such a perfectionist when truing cranks. I'd be happy with +- one thou. :-)
cheap ass chinese crap from the sema show. at some point i am going to make some good soft jaws for it.
tatro
The .06 over answers why it wasn't honed round... Crazy. What's the point to that?
What is the fabrication/brand, on the cylinder and piston? good review
axtell cast iron. the only way to go.
tatro
Thanks for answer! Then i know, very intresting films you do
can i press it out a little to get my clearance it turns smooth and easy or push it out all the way
what are you talking about.
tatro
what if u have no play when you install the crank
it blows up.
tatro
once the wheels are torqued in the cases, will they stay true?
not if i test ride it.
tatro
I want a tool bucket like the one you have.
it is a tupperware cake cover. they last for years.
tatro
what size is the piston to make it a 90 ci
on this motor 3-7/8".
tatro
Tatro Machine what cylinders do you use to make it that size
axtell cast iron.
tatro
what kind of crank installer on sportsters
stock sportster or s&s work.
tatro
how long did it take to learn how to use that balance machine it looks really hard machine to understand.
that is not a balancing machine. it is a truing stand. it shows how true the flywheel assembly is, not balance it. like most things, it just takes practice. that is why i show you how to do it and why i do what i do.
tatro
Oh cool I learn a lot here.
WHO made the true stand ? I am thinking about making one. I am a machinist so it should be doable 😀
What is your favorite engine to work on. And, what is your favorite bike?
flathead race bikes. my 1942 wla.
tatro
Is this a drag bike or a every day rider?
street bike.
tatro
you don t balance the crank
could you machine down the outside diameter of the cylinder, to fit the case? probably a dumbass question.
no, the case has to be bored, the cylinder has to remain a certain thickness.
no, the cylinders are way to thin already because they are .060 over now. everyone likes thin ass bigbore cylinders but they actually make less power because they flex all over the place instead of sealing the rings like they should. that is why all cast iron cylinders make more power than flexibly aluminum cylinders. no strength.
tatro
wow, walk in the park balancing....not