Stumbled across this mugen head, anyone know what year and other details?
I bought it anyway. I believe there are mugen parts which were raced by team honda/mugen, and they also sold “kits” for “normal” riders, am I right? That’s at least as far as my knowledge goes on mugen, and what I believe have read at some point. Cylinder head should be 83-84 or 85? I suppose if it’s real, it’s just a “hop up” like a modern day phathead or apexhead I guess? Vhm etc.
doesn’t look similar to a 1984 mugen example I found, that one the bolts are in a square. This one is like an original head but with mugen.. so I figured it might just be a “kit” part? Is it rare? Anyway am planning to probably keep it just for the “mugen” on it lol. Just wondering! Any info on mugen is also welcome. What years do they range (cylinders etc) interested!
More pics would help. Could be '83.
I am pretty sure the jug and head where worth a couple horsepower that year.
Basically a gold nugget, real cool and definitely a period hop up piece. Mugen has a long and storied history.
The Shop
That's a nice looking race chamber. A look at the cylinder could be very revealing.
Looks like a beaten up stock cr125 … 83-85 ish cylinder, but perhaps we’ll know the year of the head now? 122cc should tell something perhaps
The head is compatible ‘83-‘85. The cylinder is an ‘84-‘85 design.
This head came as a kit with exhaust from Mugen for 83 CR125 to go on the stock cylinder, The head will fit the 84 CR125 as well but not 85, I have one of these heads & tried it on 84 & 85 stock cylinders.
That’s what I thought too, that it came as a kit. Would be awesome to even see the pipe with this kit.. not much to be found about it. I have read this somewhere once but I couldn’t tell you where, that was my impression, that it was some sort of kit. So it fits 83-84 then.. sadly I sold my 84 2 months ago lol. Are there a lot of these around? Any idea what the value of it could be? No point in letting it lay around
This is the Mugen 83 pipe, I would like to know the value of the head also as I am thinking of selling mine, I have the 83 Full Mugen Cylinder and head kit so don't need it.
Today you can do a lot better than the Mugen kit. With the Super X carb from SuperTorque you can do better than a YZ. Especially from low to mid rpm. The peak hp gets a wider spread and extended over-rev. You basically won't need to shift on "the bubble". Slipping the clutch is greatly reduced. I had a guy tell me his 125X now has "a wall of torque" right off idle. I run the X on my 200SX and on the track it started running with bigger bore smokers and thumpers. Crushes my '22 YZ250f and buddies CR250F.
Is there an equivalent add-on available for the PWK Air Stryker rather than buying a $760 carb?
Pit Row
There certainly is, it doesn't have all the features of the X. FYI , George can mod your carb for the X features. Anyway, the insert metering block is mighty impressive and makes the next best carb. You still get a load of bottom end thru mid and the top is stronger and extended. The key is what size needle jet tube to run. The big .115 MX is stronger than the 113.5 MX tube. The smaller tube is the most common 125 set up. Again, for MX the 115 is going to be closer to the X carb. That's my experience with my 200SX.
Sorry for the tremendous late reply
absolutely awesome! Thanks for the info as well
yeah, I’m still curious what it’s worth too. Got it at home somewhere, sad that it doesn’t fit an 85, there’s a very very good one for sale near me for just around 1500€, all original, original paint and everything. If it fit I would have considered just to plop this head on it lol!
the pipe looks interesting, does it not have any logo whatsoever?
still curious about the value. I guess whatever someone is willing to pay. Seems they’re not too rare?
Post a reply to: Cr125 “mugen” cylinder head?