Mugen cr 125 cylinders

luckynino wrote:

Yes-that's most probably a VRP Varlo Verona did those in 1990 for the CR250 which already had the larger plastic airbox. It fits 1990-1992. I had...

Yes-that's most probably a VRP

Varlo Verona did those in 1990 for the CR250 which already had the larger plastic airbox. It fits 1990-1992.

I had it in 1990 on my VRP already where you usually still had the smaller airbox that was covered by the numberplates. But to be even more ahead i not only changed chassis but also the plastics and mounted those of the 250 to have a completely different CR 125 than my competition



Here's the spacier looking '89-'90 VRP airbox with integrated airbox which already had the bigger volume of the plastic airbox offered in years to come. VRP was really ahead of the time.

Goodluckmonkey wrote:

He's saying about the difference between the two body styles. The factory 125's had the 250 subframe swap to utilise the larger airbox in 1990. [img]https://p.vitalmx.com/photos/forums/2015/12/01/113297/s1200_image.jpg[/img]

He's saying about the difference between the two body styles.

The factory 125's had the 250 subframe swap to utilise the larger airbox in 1990.

luckynino wrote:

As mentioned already Mugens have the exhaust ports AND HPP valves/guides placed 1,5mm higher compared to stock cylinders. The other ports are raised only about 1mm...

As mentioned already Mugens have the exhaust ports AND HPP valves/guides placed 1,5mm higher compared to stock cylinders. The other ports are raised only about 1mm. Compression is like stock (so rather low).

In the last 25 years i have seen many 125s with all kind of tuning (big bore as well) but in the end none matches the screaming mid-top of a Mugen. I still have to ride a '16 KTM 125 head to head against my AF with '90 Mugen but from what my friend tells me when he compares it to his 144cc AF i guess mine is still competitive

AND those HPP engines are like tractors...durability is unreal! My '90 Mugen now has 950+ hours and is still on its original Nicasil !! The transmission of those engines is bulletproof as is the clutch and everything else.

While the new '16 KTMs have several issues already: after every couple of hours the exhausts break, there is issues with cracked lower cases and to top it off on most 125s the exhaust valves aren't working properly. They don't open/close freely so they stuck somewhere in the middle which makes for poor low-end or weak top-end...or both

Mugen 1990 ( i actually prefer the '90 over the '91):


Mugen 1991:

MaxPower wrote:

I like the Ti case bolts you used. Can you share where you got those? Alot of Ti bolts have heads that are too large looking

brambi79 wrote:

Hi I have a 1989 cr 125 in italy, not so fine but with good condition Mugen head and cylinder. Anyone is interested in the cylinder...

Hi
I have a 1989 cr 125 in italy, not so fine but with good condition Mugen head and cylinder.
Anyone is interested in the cylinder? how much can be valuated?

thank you
Diego

brambi79 wrote:

Hi I have a 1989 cr 125 in italy, not so fine but with good condition Mugen head and cylinder. Anyone is interested in the cylinder...

Hi
I have a 1989 cr 125 in italy, not so fine but with good condition Mugen head and cylinder.
Anyone is interested in the cylinder? how much can be valuated?

thank you
Diego

tempura wrote:

Stick around for a while and contribute, let people get to know you, then try to sell it, or put it on eBay where people have...

Stick around for a while and contribute, let people get to know you, then try to sell it, or put it on eBay where people have more protection.
First posts trying to sell stuff... People have been burnt.

luckynino wrote:

As mentioned already Mugens have the exhaust ports AND HPP valves/guides placed 1,5mm higher compared to stock cylinders. The other ports are raised only about 1mm...

As mentioned already Mugens have the exhaust ports AND HPP valves/guides placed 1,5mm higher compared to stock cylinders. The other ports are raised only about 1mm. Compression is like stock (so rather low).

In the last 25 years i have seen many 125s with all kind of tuning (big bore as well) but in the end none matches the screaming mid-top of a Mugen. I still have to ride a '16 KTM 125 head to head against my AF with '90 Mugen but from what my friend tells me when he compares it to his 144cc AF i guess mine is still competitive

AND those HPP engines are like tractors...durability is unreal! My '90 Mugen now has 950+ hours and is still on its original Nicasil !! The transmission of those engines is bulletproof as is the clutch and everything else.

While the new '16 KTMs have several issues already: after every couple of hours the exhausts break, there is issues with cracked lower cases and to top it off on most 125s the exhaust valves aren't working properly. They don't open/close freely so they stuck somewhere in the middle which makes for poor low-end or weak top-end...or both

Mugen 1990 ( i actually prefer the '90 over the '91):


Mugen 1991:

ChadScogins39 wrote:

Do you know where I can find a mugen powervalve cover?