Added reply in a thread Mugen cr 125 cylinders 12/1/2015 1:12 AM

If i remember correct it's already in '89 that they had flat top pistons. The last of the ATAC engines. I'm about to get a '89 Mugen kit so i'll let you

Added reply in a thread Mugen cr 125 cylinders 12/1/2015 12:52 AM

Yes that's correct. These Mugens had flat top pistons. Easily recognizeable by looking at the heads. The shape of round top piston heads is different. On round top heads the squish has already an angle and the overall design is "rounder" while on flat-top

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Added reply in a thread Mugen cr 125 cylinders 11/30/2015 2:22 PM

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.

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Added reply in a thread Mugen cr 125 cylinders 11/28/2015 4:44 AM

No idea what these are...they seem shorter in overall height. I wouldn't use such pistons. There is a reason why Mugen pistons don't come with the window. There is no need for any experiments. Just follow my suggestions and you'll be rewarded with a ... more »

Added reply in a thread Mugen cr 125 cylinders 11/27/2015 1:55 PM

Congrats - cool find! I suggest you keep those Mugen pistons and use other pistons instead! Those pistons are "unobtainium". I personally use Vertex 22190 pistons which also come without the window on the intake side just as the Mugen pistons. I just

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Updated bike check 1990 VRP Mugen Honda 125 - Nino Fenaroli 11/25/2015 9:02 PM
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Updated bike check 1989 VRP MUGEN Honda CR 125 - 1st aluminium chassis !! 11/25/2015 9:02 PM
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Updated bike check 193 lbs / 87,5 Kilo CR 125 AF - Nino Fenaroli 11/25/2015 12:28 PM
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Added reply in a thread 1995 Honda CR125-- Modernized 4 Stroke Killer 11/21/2015 8:27 AM

Mugens have placed the whole exhaust port and HPP valve setup 1,5mm higher in the cast. Not so the side ports so it's not easy to replicate this porting on a stock cylinder. The raise of the exhaust is quite radical as is the gain in power. If you ride ... more »

Added reply in a thread 1995 Honda CR125-- Modernized 4 Stroke Killer 11/21/2015 1:48 AM

Cool project - i like that

I did the exact same thing but since i already had a potent '98 around i wanted to go full out and also opted for a modern CRF chassis...thus building a AF which now is a real 4-stroke beater! I still have a '98 CR ... more »
Added reply in a thread Mugen cr 125 cylinders 11/20/2015 1:31 PM

i hope you have a Messico "Racing" as they offer different versions...

Added reply in a thread Mugen cr 125 cylinders 11/20/2015 1:15 PM

I tried many,many different pipes with my Mugen engines and the DEP was by far the weakest !! Absolute garbage. Try a italian Messico or Tomasin R&D and you'll get serious ponies ! I also tried a Pro Circuit but didn't like it at all. It makes just

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Added reply in a thread Mugen cr 125 cylinders 11/20/2015 12:33 PM

I personally prefer the 90 over the 91. I am in the lucky position to have the choice between different bikes with different Mugens

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Added reply in a thread Mugen cr 125 cylinders 11/20/2015 8:39 AM

Just 3 weeks ago i had the opportunity to test ride new 2016 Yamahas and Kawasakis. Since the suspension of my AF was off for revision i took my '98 CR 125 along (with '91 Mugen kit). I got a lot of flack already in italian forums because of my comments:

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Added reply in a thread Mugen cr 125 cylinders 11/20/2015 6:54 AM

Well-it depends. IF you can find one that's still ok expect to pay about 1500$. There's also new ones out there,still in the original box Those go for 2500+

Added reply in a thread 1987 CR 250 fork conversion. 11/20/2015 4:25 AM

Back in the day Mugen offered these internal kits with adjustable rebound...they transformed stock forks into awesome forks!

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Added reply in a thread Mugen cr 125 cylinders 11/19/2015 9:50 PM

We're going way off-topic here. Maybe look into a thread about my AF build where you'll find all the details and pics here: http://www.thumpertalk.com/topic/993917-my-new-cr-125-afs-aluminium-framed-mugen-powered/ On my CR 125 AF you see above i saved ... more »

Added reply in a thread Mugen cr 125 cylinders 11/19/2015 9:15 PM

No - those are Kite triple clamps. Mugens are very hard to find. They got made up to '91 only and these days they are collectors items with sometimes ridiculous prices.

Added reply in a thread Mugen cr 125 cylinders 11/19/2015 1:39 PM

To save weight i basically swapped out every bolt on my bike. Most is Titanium. But the rear axle nut is aluminium and i got it from a guy in Italy who does them for Supermoto. Aluminium nut:

Stock steel nut: ... more »
Added reply in a thread Mugen cr 125 cylinders 11/19/2015 1:35 PM

https://www.youtube.com/watch?v=sqCp435gOzU https://www.youtube.com/watch?v=F8wfkXKrJdg