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That's on a stand.. what happens to that toe when you put driver in it on the ground.? Naturally going to toe out even more .? Right?

Would love to see some new content from you 😊😊😊

Cool.

Hey I’m looking to have this done to my IT490 cases, how can I contact you?

What degrees on the exhaust & inlet did you aim for ? Motocross engine?

How did you go about the nikasil removal to be able to prep the cylinder?

I like those rear shocks. Any model info on those? Just heard fox shocks

I had a '73 I got used in 1974. I always wish I had kept it but I just looked up specs and I now weight 50 lbs more than the bike LOL

What are you gonna do about the step between the crank and the boost port?

Fantastic job Jim, is there a vid of it running?

If I owned that model those are all the nods I would have done, maybe also early alloy swing arm?

Hey Man I've got a freak of nature yz490 bored to 510cc set up for dort drags. New bore has .003 tolerance so is very tight and high compression. Can't get Kickstart to engage until almost half way down. I think I need to replace my Kickstart axle. I'm also looking for ways to beef these parts up if you could please help. Thabks.

Jim is the best and very innovative

Hey Jim, any updates?

ill give you 29.95 plus tax for it

How did you do it? I am rebuilding an old jeep and want to do the same.

That’s so cool!

Hey Jim! I don't know if you still read these comments but if you do. What paint are you using for these engines? looks grate!

Interested in the '76 175cc if still available. I have two 1973's a ME74 and ME100.

Has to be witbin 7 grams

Hello Jim. I have noticed strange things in the piston design. It does not match the configuration of the cylinder channels. This exhaust port configuration requires a KTM-designed piston. In your case, the right and left exhaust ports will be connected to the crank chamber through a purge through the notch on the piston above the pin. The design of the piston skirt on the intake side is also surprising. As if a third-party piston of a suitable diameter was taken. It has a number on it, can you find out what it is from? Piston CR500?

They do the offset weight bias (side to side) as a way to smooth the power delivery. It's sort of fly wheel weight without the weight of a flywheel weight. The offset weight takes some of the power stroke "spike" away. Cool vids. 👍 Nothing wrong with going back to neutral on it though.

What’s your thoughts on expanding those secondary exhaust ports?

I wish you were my neighbor!! I have all kinds of ideas like you, but not the skill to make it happen.

this is the content we need customing bikes is real fun

mine was like that too, pro tip: check if the base gasket area is level. mine was rised a bit around the main studs, and check the reed too. alot of "false air" areas on these.

Andy Gibb.....nice music to work to

AGAIN...everything you touch looks perfect👍👍

Man that thing is AWESOME!!! It looks like it rolled off the factory floor....so, so nice!!!

Just subscribed to your channel. I have my own channel and I dink around on motorcycle projects. What YOU come up with is how I see stuff in my head, but it rarely comes out that way......well, actually it DOESN'T come out that way. I love your 465 tank....I've had a 75 DT 250 tank that shape.... that's no small task to do what you've done!!!. I will be slowly watching all your videos one at a time. Nice nice work!!!!

Nice ! I had a 1974 Indian MT100 .Bought it new in Perryville Maryland.

Do you have a before and after power chart of this modification? Where does this idea come from?

Come on! Couldn't you have at least started it up and made some noise? Where are your action videos?

Thanks for sharing. Great info.

thank you for making this video. Planning on building a BRC 500 Motard for next year.

did you ever get this on a dyno?

Nice work!

Hey get back to me. I have an Indian 1973 mee 100

Is there a shop that does the Nikasil? I’ve been wondering about old chainsaw cylinders?

Start your bike firing riding this bike yaaar

Way cool!!!!

Hi ... Nice vid.

Those aren't boost ports, they are Boyesen ports, actually "supplemental passages". In 1985 - 86 lawsuit Honda finally admitted they might not have invented them so took out licensing for unlimited use of them, along with settlement for using them in 1978 CRs and later bikes.

How much cc your bike from. Phillipines thank you

Always enjoy learning from you. You are very knowledgable and you do quality work that I have never seen on the internet. Thanks for taking time out to educate guys like me that want to learn properly.

Do not knife edge ports in cylinder.... im out... pfffff

Now I gotta pull motors apart and make sure my boost ports aren't being blocked lol thanks for sharing this tip!

Nice work. One of these days.......it'll be great.

Hi, are you able to do this for others looking to fix this issue on their 490’s? I have one I’m getting and I’d love to have this done if you would do it for me.