Mugen Cylinder for TRX250r.

[Keithmart]

I ran across a Mugen cylinder the other day. The jug fits on the cases just fine but the bolt pattern for the head is different than stock. Anyone know where to find a head that matches the Mugen jug?

[ky 2stroker]

never heard of a mugen cylinder? got any pictures of it?

[Keithmart]

Maybe this is for a 1982 cr250r?

[ky 2stroker]

is that a powervalve cylinder?

[Keithmart]

It appears to be Hondas ATAC powervalve system. Here is a pic of the jug on a brand new (take out) 86 ATC250R std bore bottom end. It bolts onto the ATC bottom end perfectly. The ATC/TRX head will not fit. The ATC head is nearly the same but is a tad smaller (OD). Also the bolt pattern is a half a stud width tighter on the ATC head. Anyone have an 82 CR head for comparasion? Anyone know of a good site for Mugen info?

[flotek]

ask member 1upfront ,he has a mugen pipe these products were made for trikes i belive

[Keithmart]

Thanks for the lead. I will ask 1upfront to join in on the topic. Mugen is (to the best of my limited knowledge) a preformance company which was started by the son of Mr Honda himself. They started making parts for Honda 2 wheelers in the 70's and expanded to ATC250R's in the 80's. They were no longer making ATV cylinder kits when Honda introduced the TRX250R but they did make a water cooled kit for the ATC250R which of course will fit the TRX. This is not a jug for the ATC but its damn close. Maybe 1up can provide the lowdown

[1upfront]

Hey man that looks like the the cr mugen cylinder to me, mugen was a sister company of honda aswell as showa mugen was hondas sons company and showa was honda's brothers company, mugen also made products for the atc's and trx's they made a mugen 360 kit for the 81-82 atc 250r's and they made a bigbore cylinder for the liquid cooled models atc-trx but it looked slightly different.
Here's a pic of the trx/atc cylinder.
http://www.3wheelerworldforums.com/a...9&d=1127454348
http://www.3wheelerworldforums.com/a...0&d=1127454348