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Completely unnecessary to torque those.

What is exactly a good compression number for the 206

How make air pressure are you using on tester when doing leak down test hood video

Thanks jeff

I don't think briggs engines like me very much 😂

15% seems excessive for an out of the box l206. I check mine religiously and they are never above 5%. When I check my leakdown after I get it back from an engine builder it is below 1% cold.

What oil do you use for racing? Did you dyno’ed different ones? Thanks for those videos! It helps a lot! Saving money!

I was guessing upper for failure.. Then punched the window and then broke at the crank. I just wonder off the flip had anything to do with it? Like over reving upside down? Great vid!

You're missing a rod bolt - it could be a connecting rod bolt failure. That would also be consistent with seeing minimal damage to the rod journal and cylinder wall.

Shout out to @spencergiles72 for all the great feedback!!✌

Thanks for sanity checking the results. What tipped you off that something was wrong? Why did the highest horsepower at the largest lash not make sense?

Nice! Aggressive on the gearing. On the limiter much earlier than I would have expected.

Awesome tutorial and info!

Is there only one braking zone there?

Question: Valve lapped and set the valve lash. Piston cycles fine until I put in the spark plug is put in even part way I can really pull the starter as the piston no longer cycles. Is this a valve lash issue or something else? Thanks D

U should do voice overs the driving to give more perspective would be cool. Nice vids tho

Nice racing

Another thing to try is moving the exhaust silencer on the pipe

Sorry to be negative but the music really sucks. Its hard to hear what you are saying. Also, how consistent is this dyno? no point trying to find 0.5 HP if, with no changes, Dyno runs show a variation of 1 hP.

Thanks a lot for fixing my engine and tuning it up 😂 I just did a practice today with the 1st time with that motor and it rips!!!

I feel sorry for your neighbors 🤣

Do you cut the hub key too? If you cut the axle with the normal key it won’t slide all the way to the end of the hub

Might have missed it, but what was the exhaust lash for these pulls?

How much does the 206 refresh usually cost. Out here in Tooele

You installed the weights backwards from how they came out. Which is correct?

Why not put the weights on the opposite side of the engine but on the frame?

Interesting results. Sort of supports the idea that a faster opening of intake valve (although delayed) may cause more air to be drawn into the cylinder even with the shorter duration of opening. Odd to see the dip in HP @.004. How many pulls do you do for each lash setting? It will be interesting to see how the exhaust lash settings affect the overlap and torque.

thank you

You and #514 out there putting on a show. Awesome finish line photo.

Could be vapor lock. You got the fuel pump right on top of the head don't you? Probably building up heat and vapor pressure. You never know though until you find it.

Hi! Are you on Instagram? Or Facebook? I would like to write to you in private message.. Do you have a project of your test bench?

I will definitely attest that this engine is not down on power! Love racing with you guys!

Love these videos. They are so detailed. Keep them coming. Thank You!

What brand of grease do you use?

I like to replace the "washer" shack-up with an aluminum bushings made to the same dimensions.

This is great stuff. I've been really looking into optimizing my engines beyond the usual (float, clip, etc) and lash was one of the things I've been experimenting with. Thank you for sharing this. I've been doing some research (some of it from your posts on 4cycle and here) and it seems that there are two benefits to lash: increasing lash increases rate of opening of the valve, which can increase power; and changing valve overlap can move the powerband around. I tested this awhile back with my local tuner and we noticed that increasing intake lash noticeably increased torque but shifted the powerband to the left and we lost some horsepower. If I understand correctly, increased intake lash can *reduce* overlap because the intake valve doesn't open as soon as it normally would when the exhaust valve is closing, effectively reducing overlap. Out of curiosity, when you ran the tests for 0.06 and up, your AFRs shot up to near stoich. Would this be because the exhaust valve is opening later and i.e. allowing for more complete combustion?

I like "dials" because there batteries do not go dead.

Thank you for doing this test and for doing it methodically. I look forward to the tests where you hold the intake constant while changing the exhaust (or vice versa). A request - any chance you have multiple runs with the same engine settings? I'd like to know what is the run to run variability so that when there are results for different conditions, we can have an idea of how much of the change is run to run variability vs the change in the condition. Thanks again!

please give some more information on this video...thanks

Hey there good videos I have a old dynamite kart engine dyno the software is super old the company has gone out of business do you know of a company I can get newer software from to get mine going again

Lapping valves with the drill is a no-no. I was scolded by a well known machinist. A back and forth motion using a suction cup tool is the best way.

Nice videos! On the leak test does the gauge on the left say the pressure is 15 PSI? Was curious if you have increased this pressure. Thank you! Keep up the good work!

I have a question. I used to ride karts growing up, everything from trikes, yard karts. My pride was my dart kart. Anyway, I'm 53ish now and finally got a used PRC kart. The motor is a beast. Fastest engine in a kart I've ever driven. My question is, how do i tell what kind of motor. The guy said it's a cyclone but I'm unsure as he sounded. He said it is a stage 3. How does one tell about that without opening it up? So now I scour through the videos.

What oil is best to use?

Great explanations, videos, love that you are data driven, and I really like how you use your tools i.e. with a lot of respect and care! A couple of questions for you. Around 14:00 you were taking measurements using the protractor and a depth gauge. Was that to profile the cam? What were you looking for? I'll recheck but i haven't seen you do a carb service video. Could you please consider doing one? Thank you.

Thanks great video!!!

Where did you buy the 30 degree additional cutter from?

Great video. This is exactly what I was looking for. Thank You!

I got an issue with my lo206 in senior class. Once the engine reaches 48 mph the engine gives a "popping" sound. It almost sounds like its hitting a rev limiter. Would a fix be a tuning on the engine, valve timing, or something with the carburetor? Also once i reach the speed where the sound starts i slightly lift off because i am not sure if it is fine for the engine or not and I see others in my class getting up to 51 mph just fine with no "popping" sound.

Would you be kind enough to point me in the right direction on the kit for cutting the valves? We are not allowed to change the profile in the UK. Thanks in advance!