82 Mugen 360 build

[stroberts22]

Last year I finished a build of a 300r and learned alot about the 1st gen 250r. This year I come across a mugen cylinder, head and a Mugen exhaust. I was going to put it in the 300r frame but I found enough stuff to do another complete build. I already got the decals made for the mugen build and they turned out good. I'm going to completly debadge the 3 wheeler of any honda emblem and replace it with mugen name. I want to stay true to the roots of a 82 racer with a few modern controls to make it ride easier. I have already modified the cases to accept the Mugen cylinder. The machinest also machined off the honda emblems on the clutch and stator cover. Here's some pics of what I've done so far.

Here's the stickers I got made for the Mugen

I'm going to take the honda the tripples and put a mugen sticker on it

Here's where they machined off the honda for the Mugen sticker. They recessed it a little to protect the sticker from a boot.

Here's some pictures of the motor mocked up

The cases had to be bored to make room for the 83.5mm bore

[Bryan Raffa]

Nice Build ...christmas is over lets crack the wip and build it!

[Yamaha_Rules69]

Very nice progress so far! I love the first and second gen 250R's, there is just an old school cool to them, thats for sure! I'll be deffinatly be watching this build. Keep up the good work!

[MTS]

Looks sweet!!....whats that piston out of...??? looks like a Wiseco..

[stroberts22]

Looks sweet!!....whats that piston out of...??? looks like a Wiseco..

Yea, It's a custom made Mugen ME360 Wiseco piston. It measures 83.5mm where a stock is only 70mm.

[CanadianThomas]

Yea, It's a custom made Mugen ME360 Wiseco piston. It measures 83.5mm where a stock is only 70mm.

Now that's going over stock! this is gong to be a killer build/thread. Thanks for sharing (and making me drool).

[sx250heath]

That would be nuts. I have an 81 250R i can't even imagine what a Mugen would be like. I would like to find a hondaline top end for my bike though.

[84 r]

and i thought i was goin big at 77mm haha cant wait to see it done if its half as nice as your other trike you did a killer job!!

[stroberts22]

Got my motor back from Flotek the other day. The piston wasn't uncovering the ports all the way and was coming up short of the deck so I decided to go with a stroker crank (69mm instead of the stock 64.4mm) to fix the problem. It's going to be 373.33cc now with the stroker crank. Flotek ported it and got the squish figured where I just have to put it together. I' m going to send the cylinder and piston off to US Chrome to do the nicasil plating and the are going to coat the piston with that anti friction stuff. Big Bore is making on of his hubs like he used on his 480 so I can use 200x forks and brakes and still keep the wide front end of the 1st gen 250r. I will be running 10" Douglas wheels to clear the brakes. I've been getting a pile of parts ready to go to the powder coater. I'm going to try to get every part powder coated at one time unlike the last build where I made several trips back and forth to the powder coater. It slow going but I want to take my time on this one.

[Dirtcrasher]

I thought MUGEN cylinder/head had the 7 bolt head? Yours looks like the 6 bolt with a headstay.......??

I'm building one of these now for a member, thats why I mentioned it.

Looks great though!

[stroberts22]

Hondaline 300r kit has 7 studs. Mugen 360 has 6 studs and is based off what they where doing to the 78-80 cr 250. The hondaline kit has a stock bore of 76mm compared to 83.5 mugen cylinder. I got a flotek ported 300 kit with a trx 330 piston on my other 82 R and the power is unreal. I hoping the Mugen will make the 300 seem like nothing.

[Peekaboo]

that is sweet!

[Bryan Raffa]

good to hear the progress, whos coating the piston?

[stroberts22]

good to hear the progress, whos coating the piston?

US Chrome does it all and they offer a discount if you have a atva card.

[Dirtcrasher]

Hondaline 300r kit has 7 studs. Mugen 360 has 6 studs and is based off what they where doing to the 78-80 cr 250. The hondaline kit has a stock bore of 76mm compared to 83.5 mugen cylinder. I got a flotek ported 300 kit with a trx 330 piston on my other 82 R and the power is unreal. I hoping the Mugen will make the 300 seem like nothing.

I guess I have it A$s backwards........... I thought the 7 bolt was the 360 and the 6 bolt the 300.

I'll measure the jug and gain some knowledge