Banshee 521cc Super Cub motor build.

Taking out the 421cc cub to build a 521cc Super Cub

[@peterk5460]

🐐 Couldn't be happier with the 4mil stock rebuild you did for me this past summer 🙌

[@mccafferycustoms5091]

When I watch these videos I imagine how the glamis dunes used to be in the 80’s. Bet it was awesome. Hey Kevin. I don’t know if you do your own machine work but I would love to see the process of boring/honing some cylinders. Trenching some cases. Ya know. Normal banshee machine work. A lot of guys don’t like giving information out to the public about these engines but it seems like you don’t mind. That’s a good thing for all of us younger guys that don’t have as much time with em as you do. Thanks Kevin.

[@Eric_661]

I was like that looks like mine 😂 that 421 ran good over 100+ hrs

[@austenpadilla7852]

Dang man I heard since you made the video on my 521 this is the new hot ticket 😉

[@chihuahuaverde425]

Nice work!

[@Speed295]

What kind of hp are we talking about whit this 521cc kit? Wery nice jobb and a super informant video THX from Sweden

[@herrjugsracing7816]

This one 130HP

[@WestCoastRoller]

Thanks for video..been thinking of doing same upgrade with my 4mil. Question...I'm going from sea level to 6000 ft. Do I need different dome size or can i just rejet? Have 24cc now. Pump gas.

[@herrjugsracing7816]

Yes you do. My guess without doing the math would be 21cc.

[@WestCoastRoller]

@@herrjugsracing7816 thanks

[@Eric_661]

I had the adjustment wrong on the clutch blow up 3 of them till I figure out I was doing it wrong

[@66garagecilacap]

@herrjugsracing7816 awesome video, I'm building a yammagamma (an RG250 gamma chassis with an RD350ypvs) is 421cc the biggest you can go without machining the crankcase? and what kit would you recommend for a street bike application?

[@herrjugsracing7816]

That is correct. I like the 421 cub or cheaper alternative do the 421 Athena. m.kzbin.info/www/bejne/api4Z4Z9i6aAetk&pp=ygUSQmFuc2hlZSA0MjEgQXRoZW5h

[@66garagecilacap]

@@herrjugsracing7816 thanks!

[@imme3932]

I have a question can you fit blaster pistons in banshee cylinders (jugs) ? And if so what other work would I have to do?? @herjugsracing

[@herrjugsracing7816]

You only use blaster pistons on stock cylinders for 66mm bore and above on 58x115 stroke cranks.

[@chadwems]

I got a fresh pro mod done by Tyson racing with new shift forks. He said use a stock un modded shift star. I feel it doesnt shift as smooth as it should. Do you recommend switching to a modded shift star? i already have modded shift detent and shift shaft.

[@herrjugsracing7816]

As long as the spring rate is stock I would run a modded star.

[@jj-hf8jy]

First!

[@tsar-bomba2413]

Did you torque all your bolts and nuts off camera?

[@herrjugsracing7816]

Yes, the videos are too long as it is. I stick the torque info in every video for reference.

[@Speed295]

Can you 421 or 521 sets whitout nicasil I prefeer real steelsleevs. sorry for the spelling.

[@herrjugsracing7816]

You can get 68mm iron sleeves for the 421 and I'm sure you can find other sizes too.

[@travislawson1185]

Just curious what the benefit of the trans promod?

[@herrjugsracing7816]

Helps on shifting when the horse power goes up. At a certain point the shifting slows way down and becomes frustrating.

[@travislawson1185]

@@herrjugsracing7816 thank you for the explanation. I mostly build vintage street and some vintage race bikes and, over the last 20+ years, I have built about a dozen modded RD350s and a couple RZ350s but I hadn't seen anyone mill off the gear sets. It makes perfect sense I guess for drag racing a quad but I doubt I would see the benefit on a street motor.

[@geoffmcwiggan2814]

What is the cost of one of these engines complete? 👍🥃🇦🇺

[@herrjugsracing7816]

It changes as time marches forward. Check website or contact me for prices.