Mugen 360

[1upfront]

I just got this yesterday now all I need is a head for it lol.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0792.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0794.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0795.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0796.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0798.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0799.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0800.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0802.jpg

[firefirefire90]

damn! That's sweet dude! Do you have any sources for the intake boot and piston? What pipe/carb combo will you bet using? Details details!!!!

[Saul]

It's going on his trail-r so I'm guessing the pipe will be the bassani and a 34mm carb?

[tecat-z]

Hard time reading the calipers.......... How many mm's? So you have a true Mugen 360? Oh boy, this is gonna be good. Just be careful removing that broken stud.... I believe those had a nicasil finish.

[1upfront]

Hard time reading the calipers.......... How many mm's? So you have a true Mugen 360? Oh boy, this is gonna be good. Just be careful removing that broken stud.... I believe those had a nicasil finish.

It's right around 83mm's, that stud is just missing I ran a tap in it today and cleaned it out some of the other threads where packed full of crud too on the intake and exhaust, the hard part is gonna be finding a stud like that one it's larger on the cylinder side. the aircooled mugen cylinders where chrome plated but I'm going with nicacil when I get it done.

[1upfront]

It's going on his trail-r so I'm guessing the pipe will be the bassani and a 34mm carb?

I'm considering putting it on my 300 now.

[Saul]

I'm considering putting it on my 300 now.

ohh the plot thickens!

[tecat-z]

I know the 85 kx 500 had a stud similar to what you are explaining. If you give me the dimensions i may be able to help.........

[Daddio]

I know the 85 kx 500 had a stud similar to what you are explaining. If you give me the dimensions i may be able to help.........
We may take you up on that Ed.
It's funny how things work out. 1upfront just got another 300 kit then this cylinder comes out of nowhere. So I started looking for a head for it and now I have a lead on a 360 kit. I also found a guy with a head for it but he needs a head for a 78-79 mugen 125 and wants to use the 360 for a trade. I guess eventually things will work out. When it rains it pours.

[thejake456]

would one of these just bolt right up to a 84 250r bottom end?

[SYKO]

no they require case machining and it to be done correctly.

[Daddio]

would one of these just bolt right up to a 84 250r bottom end?
The Hondaline 300 kit is a direct bolt on but the Mugen 360 requires machining to the cases and the crank as Syko stated.
Here is a link from vintagefactory. Thanks Scott "phasefive ".
http://www.vintagefactory.com/mugen_me360_instruction_sheet.htm

[Daddio]

damn! That's sweet dude! Do you have any sources for the intake boot and piston? What pipe/carb combo will you bet using? Details details!!!!
Intake boot for the Odyssey fl 350 will be used for this one.
Polaris 400 piston will be used.
He has a cobra pipe a bassani pipe and a Mugen pipe to choose from.
I'm thinking that the 39mm pwk that is on the 300r will be used.
Those are the easy things.
Thanks to petesatc for the hard part. :beer He found a head for the cylinder. :naughty:
This thing is coming together quicker than I originally thought.shens
It wouldn't have been possible without the networking that you get from this site.:w00t:

[Saul]

He has a cobra pipe a bassani pipe and a Mugen pipe to choose from.


Try all 3 and see which performs best! :beer

[1upfront]

My Mugen head arrived today all the way from the UK thanks to a fellow triker petesatc he went out of his way to find it.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0905.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0904.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0903.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0902.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0899.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0898.jpg

[BigRed_Ryno]

Its always Pete that comes up trumps B)

[1upfront]

I figured since my 300r motor has low hours on it there's no sense taking it all apart just to use the cases on the mugen motor build so I dug out a motor I bought awhile back from ebay and I'll be using it for the build, I'll be sending the cases to the machine shop this weekend for boring along with the crank to be drilled all according to the mugen instructions. Here's some pics of the motor ready to be machined.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0919.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0923.jpg
Tranny all plugged off to keep metal chips out during the machine process.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0921.jpg

[cr480r]

Do these airfoolers have stout trans components? your cylinder swap projects have got me thinking about a 480 cylinder swap... 89x72...

[NewfieBish]

so that motor's... huge! nice find man

[aaron7]

Damn those two parts are what... $1000 easy right? Nice find!

[1upfront]

Do these airfoolers have stout trans components? your cylinder swap projects have got me thinking about a 480 cylinder swap... 89x72...

The only problem I ever had was in the clutch, the stock setup doesn't agree with 5,000 rpm launches while riding the clutch lever LOL, but with some welding on the clutch hub to make it one piece rather than two you will eliminate the clutch chatter making for much smoother launches.
I had these two pieces welded together.
http://i39.photobucket.com/albums/e183/lrdunlap/100_0347.jpg

[Yamada]

1upfront, even if I don't own a air coooled 250R, I thank you for sharing all your knowledge about these trikes. A lot of people keep their project hidden and don't want to share anything with the others. Some people here claim to modify their bike to be faster but don't want to tell us what they did. Not only you show us what you did, but you also explain it. :TrikesOwn

[1upfront]

Damn those two parts are what... $1000 easy right? Nice find!

Yeah it's worth about 1,000 for an NOS kit though you'll spend around 4,500 lol.

[1upfront]

1upfront, even if I don't own a air coooled 250R, I thank you for sharing all your knowledge about these trikes. A lot of people keep their project hidden and don't want to share anything with the others. Some people here claim to modify their bike to be faster but don't want to tell us what they did. Not only you show us what you did, but you also explain it. :TrikesOwn

No problem man I try my best to get the information out there for anyone who need's it.

[1upfront]

I got some of my parts today for the mugen motor build, bearings, seals and so on.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0926.jpg

[edog]

I got some of my parts today for the mugen motor build, bearings, seals and so on.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0926.jpg

Nice to know all those parts are available.

[Enginerd]

I got some of my parts today for the mugen motor build, bearings, seals and so on.


I think I read somewhere in one of your posts that you and your Dad work at a Honda shop. Do you use all Honda parts because you think they are the best, or because you get a discount(imagine a quetsion mark here. That key on my laptop no longer works:rolleyes: )

[1upfront]

I buy honda parts because I have found that OEM is the best quality, me and my dad do body work at a honda car dealership but the boss owns a honda motorcycle shop next door and I get my parts there for a discount.

[Bigbore]

Here's a copy of the machine work needed for the cases and the crank.

[1upfront]

I got my cases back now I'm just waiting on my piston and crank, then I can mock it up and decide weather the piston will be usable, it's a polaris scrambler 400 piston.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0946.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0947.jpg

[1upfront]

Ok here's the crank back from the machinist you can see the holes drilled according to the instructions and my high quality mask job on the rod.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0958.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0960.jpg
And I stole a stud out of my 79cr125 motor for the mugen so I had one made to replace it.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0961.jpg

[Daddio]

I did some research and found a new piston and rings for the Mugen 360. Now the cylinder will be sent out for re-plating.:w00t:

[1upfront]

I had no flange for the mugen cylinder and it's bigger than a stock 250r flange so I ordered a new cr480 flange and it fit's perfect.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0957.jpg

[ATC-Eric]

God you two are ridiculous! lmao


That cylinders huge! Cant wait for you to fire it up!

[88 Turbo Coupe]

I had no flange for the mugen cylinder and it's bigger than a stock 250r flange so I ordered a new cr480 flange and it fit's perfect.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0957.jpg

The CR250 flange also fits.

[1upfront]

God you two are ridiculous! lmao


That cylinders huge! Cant wait for you to fire it up!

lol yeah it will be awesome when I finally hear it run, then it's back on to my other project.

[1upfront]

The CR250 flange also fits.

LOL nice yeah I figured the 480 would work, didn't really think of the cr250, these flanges are expensive though I know that much.

[88 Turbo Coupe]

I did some research and found a new piston and rings for the Mugen 360. Now the cylinder will be sent out for re-plating.:w00t:

Wiesco makes them too.

[Tecate 50]

My 85 Kx500 cylinder had those weird looking studs! I pulled them out and they are all in great shape. I really have no use for them anymore, and you are more then welcome to have them if you need them! Thats if they will fit the application.

[1upfront]

Wiesco makes them too.

Yeah my dad has been in contact with them already.

[1upfront]

My 85 Kx500 cylinder had those weird looking studs! I pulled them out and they are all in great shape. I really have no use for them anymore, and you are more then welcome to have them if you need them! Thats if they will fit the application.

Hey man I really appreciate it but now I wont need them since I got that one out of a 125 motor, thanks again though man:beer

[1upfront]

Got my piston in for the mugen today:D here it is next to a stock bore wiseco.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0965.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0967.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0969.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0968.jpg

[1upfront]

http://i416.photobucket.com/albums/pp245/lhdunlap/100_0970.jpg
Rings
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0970.jpg

[1upfront]

I noticed when my mugen head came in that the spark plug hole is straight up and down instead of angled off to the right side and thought it might be a clearance issue so today I mocked it all up in a frame with a tank so I could see if everything would clear. I also wanted to get a stock pipe in the frame to see if it was going to interfere with the head fins, I plan on having jemco make me a 83-84 250r pipe with a bigger inlet and stinger, I figure if the stocker clears everything then the Jemco should too if put together correctly. Here's some pics from the mock up, the stock pipe cleared everything and so does the plug and I was able to get a socket and ratchet on the plug too that was another thing I was worried about.
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0981.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0985.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0980.jpg
http://i416.photobucket.com/albums/pp245/lhdunlap/100_0983.jpg

[SYKO]

hey man the JEMCO wont clear the head I know for a fact! I had to take off part of my fins when I had the 300 on it, so I know you will have to mod the fins on yours to clear. And it was correctly mounted on all the hangers, just thought I would let you know.

[1upfront]

Thanks for the info syko. I wish I had access to a 83-84 250r jemco pipe for comparison, the mugen cylinder itself is no taller than a stock cylinder, the 300r is actually taller but the fins on the mugen head are taller than both other heads.

[Louis Mielke]

Hey why don't you PM bigbore and see if he has any of the those mugen bigbore pipes left? I think he's running one of those on his CR480 topend with no mods needed. That would solve you pipe problem and get you the full mugen kit!


Man oh man. The open class at the drags is gonna get it's clock cleaned. You aiming to take down the big green monster of Marks?

[1upfront]

Hey why don't you PM bigbore and see if he has any of the those mugen bigbore pipes left? I think he's running one of those on his CR480 topend with no mods needed. That would solve you pipe problem and get you the full mugen kit!


Man oh man. The open class at the drags is gonna get it's clock cleaned. You aiming to take down the big green monster of Marks?

I have one of those pipes but they are 81-82 250r pipes and just wont fit, the fat part of the pipe is in the wrong spot and interferes with the tank and head. They never had a mugen pipe for the 83-84 model so now I'm stuck with having something made lol. I don't know if I'll be beating Mark though he's still 150cc bigger, and I thought he was running alky and a dragpipe, mine will just be on gas with an inframe pipe if I can get one that will fit lol, I may look into a dragpipe:wondering

[Louis Mielke]

Bummer! I'd say since you're just drag racing the outframe would be fine. I know I saw a Jemco pipe for a CR500 that looked amazing. You may wanna ask them what they could do for a outframe for you.

[1upfront]

Bummer! I'd say since you're just drag racing the outframe would be fine. I know I saw a Jemco pipe for a CR500 that looked amazing. You may wanna ask them what they could do for a outframe for you.

Yeah that would look pretty sweet an outframe built in the same fashion as their inframe pipes I'm not completely sure what I'll do yet but I'll be finding out real soon.

[1upfront]

Well I've had a change in plans with the mugen motor, the 300r is staying exactly the way it is and the mugen 360 motor is going in a first gen 250r. From what I understand the 360's really shined in desert racing so I figured Id go that route with the build, I plan on running a ball saver seat in blue, works shock, +2 swinger, progressive fork springs, maybe a wide axle, vf3 reeds, billitt clutch basket, I already have a new mugen pipe for it and an air stryker 38mm, first step though is to start looking for a NICE 81- 82r preferably 82, I want to start with something in VERY GOOD condition so I won't have to spend a whole lot of time or money just fixing crap and focus on upgrades like listed above.

[Nevois]

iv looked every where for a billet clutch basket for my 83 honda 250r... if you find em let me know sum details... thanks

[lndy650]

good thing you got a pipe i dont think the 360 would like a stock 250 pipe very much...

[Daddio]

iv looked every where for a billet clutch basket for my 83 honda 250r... if you find em let me know sum details... thanks

A few years ago They were available in the UK for around $300 US. It requires mods to make it work. They were for the 78-80 CR250.

[pipeline triker]

Really lookin nice. That thing should be pretty wild. What is the comp. likely to be, will need a strong leg I am sure. I have a old Dirt wheels mag where they compare the Mugen to the Honda 300 kit. It is kinda a direct bolt on kit Verses a more intense mod kit. in the mag they say the mugen is to powerful for regular riding and should be left only for closed course racing. Makes you want to ride it even more. lol

[MagicJames]

I miss 1upfront lately! Where has he been?

[Daddio]

He's been hanging out with friends :beer and riding and racing. I look for him to be back more often when it gets cold out.