Attention, not registered on the road, only reserved for competition.
Here is undoubtedly the most powerful kit of the market for MBK 51 air cooling in 70cc!
THE CYLINDRE ENVIRONMENT
So this is the whole MVT S RACE 70cc for MBK 51, suite has many requests, MVT had the desire to come out a beautiful piece in large diameter, so they took their knowledge bases of their brands AGP (ALAIN GODOU PRODUCTION) / > MVT on the 50cc competition, to get a real 70cc competition cylinder!
Unlike the other 70cc cylinders of the market, we are not on a nice set that comes out its power at 8,000 laps, you will see that we are clearly on something that asks to scream and take turns!
*It is useful to remember that different cylinders MVT won in competition, including the base that served as a little brother to this one?
It is therefore on a 46mm diameter cylinder, which therefore 69.61cc on race origin 41.8mm and 74.51cc on long run 44,9mm RRD (attention, laying on long run requires big modifications).
The lateral light transfers are divided, i.e. the channels have a partition partition at the entrance but not at the exit, one is on one side light on each side! This is a way of doing that has proven its worth on different 50cc. There are two standard rear transfers. So we have a 6 divisional transfer, an admission light. Attention, you can see that the separation of exhaust light and lateral intake transfer is very fine. So we're not gonna go sizing and touch this place! It's already at the best.
Transfers to the pack are huge and they are beautiful, we see directly that we are on a racing cylinder... Who is made to breathe!
Mounting level to the exhaust, we have a simple M32mm thread, no possibility to mount a flange 2 screws PEUGEOT 103.
The finish is a bit disappointing at the transfer level, it's not terrible for "instagram" and spread the gallery on the internet. For those who remember, in the 1990s, the ZETTA MALOSSI POLINI we weren't so well done, we've become much more pointy! And it will not hinder the proper functioning of the whole, but clearly, the finish, "can do better"! After you say that a simple microbillage over the shadings would directly give another aesthetic effect. So let's be clemency. This cylinder has other arguments!!!
Nicasil seems to us to be of great quality, and honing too, it is a parameter that we find on the new cylinders MVT!
Alleluia, 3 seals are packed in this cylinder, some marks should take seed!!!! Especially for a price so reduced, because we will be around €200 tax incl. (price 2024)! It's the price of a clutches-free set at home MALOSSI or POLINI today.
THE PISTON
MVT decided to deliver its 12mm axis piston instead of the 13mm axis initially mounted on the MBK. So you'll need a slightly thicker 12mm axle cage, so a 12X16X16 cage, and seeing the power that the beast can get out, it's a very good idea from'MVT!
So we're on a 45,95mm diameter piston, MVT, to stay on contained prices, MVT does not offer wear ratings!!! When the whole has too much game, you change the set or you find a piston that can adapt to it!
Length level, the piston is 47 mm, which is ample enough to mount a 44.9mm long race by closing the exhaust at the PMB. The piston still makes 80 grams, it's not a rainy weight! For those who want to look for another piston, we're on a 22mm compression.
The segment is alone and it is in 1mm thick to properly release the high speeds, it is a pre-rod steel segment of very good quality! The ergot is central back. The game has the cut must be respected, we're on a bark cylinder, and air cooling! Don't play with that!!! I recommend between 0.22 and 0.25 of game to the cup.
DIAGRAMMES
MVT posed 186° to the exhaust and around 128° to the admission. With this huge exhaust bark and huge intake lights, as well as its large transfers to the embalming, we understand directly or we are! We do not certify that we are accurate at the diagram level, according to engine movement, displacement, squsih... But we must not be far from the truth!
It is very clearly above all 70cc moped cylinders in the market, it will need a large carburation, an exhaust that works and agrees to a powerful engine, so MVT SP2, a ignition that follows, a variation that operates the 10,500 rpm!
If we want to put it on a 44.9mm long race, obviously, we'll find ourselves with completely huge diagrams!!! Only one solution in this case will need to call a little less to the embarrassment, and dig the ass, see, call the ass to fall on acceptable values, especially to the admission!
We can prepare the monster on even higher diagrams, but sincerely, on an air-cooled engine... He's perfect!
THE CULASS
The ass is really beautiful, slightly incoming room to protect the very good perk and make by flame. Hemispheric room, polished finish, very beautiful squish area.
Polygonal type knife, oversized to bring better cooling to the whole, it's really great!
For the rate, I took care to take it to you in real measure, I had not had time to do it on the PEUGEOT 103. We fall on 13.6: 1..
Competition requires: The candle thread is a long ass thread, you can put good racing candles with a beautiful heat transmission between the ass and this one!
CONCLUSION
Is that a good kit? Of course, it's an excellent kit. If you're looking for a quiet ride in papi mode, that you don't have a mechanics concept or the budget behind for a good pot, a good ignition, a big carburation, a high-quality embedding, forget... Go your way, it's not for you.
If you want a kit that rips off to burst on a very sporty track and ballad, that you have a little mechanical notion to properly mount and exploit all this: go!
It is a kit to pose with a large carburation, a super-reinforced vilebrequin of very good quality, otherwise you will break. According to us, you have to land with a carter who has a good metrology, so the carter POLINI. A PREMIUM ignition, it will be necessary for you to come to exploit power regimes of 10,000 / 11,000 laps, so obviously, the only pot that holds the road is the MVT SP2 the top! SP 98 and octane booster, 3% MOTUL 800 ROAD
*Remember that on a cooling cylinder by air bar, the game has the cup is super important, 0.22 see 0.25 we seem to be a minimum. For the squish, also important parameter, 0.8mm seems to us to be a good target!
Optionally we offer you an internship preparation 1, this preparation is a modification of the channels and exhaust light by increasing the diagrams and improving the duct, it increases the performance of the cylinder. An improvement in the piston and skirt stock is also included in this modification. Count an extra time for this preparation!
Optional STAGE 2 preparation! We pass on diagrams of 188° to the exhaust and 127° to the admission which makes it a truly demonic cylinder! On specific request, an adaptation for long racing vilebrequins RRD can be made for the same price!
