Latest Podcast Episodes!

Episode 23: Paint Prep

Episode 23: Paint Prep And.....we're back! Hey guys, so sorry for the delay in new episodes over the last month or so. We've all been super busy throughout the start of the summer. RaceTech moving into new offices, Jarred & Brady working on new bikes, it all adds up.  So finally we're covering Paint Prep, a topic we've been asked about before.  Our paint guru Brady Young covers most of the steps for paint prep, and Jared and Evan bring up some good questions.  We also cover some recent emails and questions at the end. Prep notes for this show:

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Episode 22: 'How to Build a Cafe Racer Guide' Review

Episode 22: 'How to Build a Cafe Racer Guide' Review Awhile back, we posted this article after a listener told us about Jim March's "How to Build a Cafe Racer" guide. We skimmed through it, but never really went over it in detail or discussed it.  After we all read the document in depth we saw it had some really good points to discuss. Make sure to download the document below and follow along to the podcast with it. Jim March's Cafe Racer Guide (PDF) We'd like to mention that all credit for this document goes to Jim March. He definitely put alot of work into compiling all this information. In this show we are using his advice as talking points to discuss, and we are not criticizing him or saying he is wrong. You are listening to our opinions on his opinions! Jim has a link in his document to tip him if you found the document helpful, but the WePay link does not work any longer. His email is in the document and it sounds like he welcomes feedback. So, what do you think?

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Episode 21: All About Suspension w/ Ed Sorbo from Lindeman Engineering

  Episode 21: All About Suspension w/ Ed Sorbo from Lindeman Engineering If you're a couple episodes behind, you don't want to miss this one! We met Ed Sorbo, owner of Lindeman Engineering at Deus Ex Machina's Saturday School event in April. Ed had a booth at Saturday School and was leading excellent suspension seminars that drew a crowd every time.  We were very excited to have him join us on the show and talk in depth about suspension. Note: this is our first show recording a remote guest via Skype. There are a few sound quality issues due to our old computer hardware. We'll be upgrading soon to be able to record remote guests with much better quality. Make sure to contact Ed at Lindeman Engineering for any of your suspension needs! Make sure to tell him you heard his Motorbike Mondays episode. Lindemann Engineering 700 East Redlands Blvd. Ste U Box 410 Redlands, CA 92373 (909) 838-4587 ed@le-suspension.com

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Episode 20: Top End Rebuilds Part 2

Episode 20: Top End Rebuilds Part 2 Episode 20 continues with Part 2 of our series on Top End Rebuilds. We pick up where we left off after describing disassembly of your motor to prepare for a top end rebuild. This episode covers the tools necessary to rebuild your top end and the steps to prepare your motor for final reassembly. It's recommended you have listened to Episode 19 before starting this show. Notes for this episode: Assembly Piston skirt scoring: Debris between cylinder and piston Motor ran hard before at operating temperature Rebore Will discuss next episode Pistons Thoroughly clean piston ring grooves, if using same pistons Install new piston rings in appropriate orientation While installing piston to connecting rod, be aware of piston orientation mark on top of piston Slide wrist pin through piston and connecting rod and insert wrist pin clip Deglazing/honing: Adding a surface for the new rings to break in Oil the cylinder wall thoroughly and tool With triton hone or ball hone on drill move tool up and down through cylinder at a constant quick motion Remove tool out of cylinder whilst still in motion Removing old gaskets: Gasket scraper Razorblade Scotchbrite pad on

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Episode 19: Top End Rebuilds Part 1

Episode 19: Top End Rebuilds Part 1 Episode 19 is part 1 in our series about rebuilding the top end of your motor. This episode will cover disassembly of your top end, and goes over the important components of the motor top end as well. Make sure to listen to Part 1 before moving onto the new Episode 20, part 2 of Top End Rebuilds. Check out the notes below for the important points to follow. Episode 19 Outline/Notes: What is a Top End? The top end of a motor is anything from the cylinders and up Why? To replace worn or damaged parts Performance upgrades Burning oil She's just tired Engine in or out? Not all bikes require you to remove the motor from the bike May be easier to rebuild it on a workbench Where to start? Remove gas tank Remove air intake and carburetors Remove exhaust Remove cables (clutch cable, tach cable) Drain fluids (oil, coolant) Disconnect battery Remove spark plugs and wires If it's connected to the motor, disconnect or remove it Removing the head: Check manual for proper process to relieve pressure off of valve train Remove cam(s), rockers, or cam followers Remove head bolts/nuts Remove heads Removing valve springs and valves: With the appropriate valve sprin

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Episode 18: How Motors Work

bmw-c650-engine-05

Episode 18: How Motors Work

This show is all about motors. 4-Stroke & 2-Stroke motors. The kind we all use on our motorcycles.  In this show we describe the important components in a motor (we’ve done shows detailing most of these components you can refer to), and how they interact to complete the strokes that keep a motor turning.  Make sure to follow along with our outline below, and look at the reference videos, pictures and links to really get a good understanding of what we’re talking about. It’s very hard to understand this topic without seeing a video depicting how the components interact.

References/Links

Jacob O’Neal’s ‘How a Car Engine Works’ animations:
This website has some amazingly designed animated GIF’s showing how motors work. While they’re specifically about car motors, this definitely helps illustrate what we’re talking about. I’m posting the images below since they are freely available online. All credit goes to Jacob O’Neal. Click on the images below to view them full size.

engine-01

engine-02

engine-03

engine-04

engine-05

engine-06

engine-07

engine-08

How 4-Stroke engines work by Mercury Marine:

How 2-Stroke engines work by How Stuff Works:

Show Notes & Outline

An engine needs 3 things to run:
1) Mixture
2) Compression
3) Spark

4 Stroke Motors:
1) SUCK – Intake
2) SQUEEZE – Compression
3) BURN – Power
4) BLOW – Exhaust

Components in a 4-stroke motor:

  • Carburetor(s)
  • Head
  • Valves
  • Cam(s)
  • Combustion chamber
  • Ignition system
  • Piston(s)
  • Connecting rod(s)
  • Crankshaft
  • Exhaust

How it works:

Intake Stroke:
The intake valve opens as the piston goes down
Creating a vacuum, draws mixture from the carburetor thru the head and into the cylinder
The intake valve closes as the piston reaches the bottom of the stroke

Compression Stroke:
Both the intake and exhaust valves are closed
The piston travels upward compressing the mixture to the combustion chamber

Power Stroke:
Valves remain closed
A spark from the spark plug ignites the compressed mixture
The burning gases expand, pushing the piston down with force

Exhaust Stroke:
The exhaust valve opens as the piston goes up
Burnt gases are blown out of the cylinder thru the head and out the exhaust pipe
The exhaust valve closes as the piston reaches the top of the stroke

Then the process starts over again.

2 Stroke Motors:

Differences:
No valves
No heads
Fires once per revolution
Few moving parts
No oil in the crankcase
Piston acts as valves

Components in a 2-Stroke Motor:
Carburetor
Intake port
Reed valve
Ignition system
Combustion chamber
Cylinder
Exhaust port
Exhaust
Crankshaft
Connecting rod
Piston

Mixture – Air/Gas/Oil:
Oil in the mixture lubricates and cools moving parts
Premix or oil injection from separate oil tank
Mixture from carburetor fills the case

How it works:
With mixture in the case and the piston at the top of the stroke after a spark
Piston travels down exposing exhaust port releasing most of the burnt gases
As the piston travels farther down it pressurizes the case and exposes a path from the case allowing mixture to enter the cylinder

As the piston travels up it forces more burnt gases out and closes the passage to the case
The vacuum the piston creates opens the reed valve drawing more mixture into the case
The piston moves up more blocking the exhaust and compresses the mixture
When the piston reaches the top of the stroke the spark plug fires and ignites the compressed mixture
Forcing the piston back down closing the reed valve and starting the process over again

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Comments (1)

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    Jeff

    |

    Good episode guys. I especially enjoyed the 2-stroke explanation & discussion – never really looked into this engine before.

    In regards to exhaust- I never understood how going from a 4 into 4 to a 4 into 1 exhaust would improve engine performance either- that is until I read the Cafe Racer Guide by Jim March you posted. “Here’s why there’s a performance boost:
    Take the case of a twin (two-cylinder). Set up right, when the exhaust pulse from one cylinder hits the
    merge point, the pulse from the other cylinder is just starting. Once past the merge point the first
    cylinder’s pulse literally pulls the pulse from the other cylinder. And when that one clears the merge,
    the cycle starts again. Same with triples and four-bangers.” I thought that was pretty cool.

    Reply

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