Jimscoot

Hi Gioulio 

Just wondering how your getting on with your Mhr? I had mine on the Dyno recently.

Hey Giulio, i haven’t touched the ports in the MHR, just a polished exhaust port and slightly matching the VRone cases to the cylinder, that’s it. 
Out of the supplied base gaskets I used a combination of two to reach 0.36mm (measured with vernier) that brought my squish up to around 1.25mm. 
Timing is set to 16 on the stator. So at idle through to around 4000rpm I’m at 19 still giving me good torque but then pulling it back to around 14@7000rpm keeping it super safe while the expansion is super charging the cylinder 

The sip Camaro is a Masterpiece and compliments this setup perfectly.

The power is phenomenal, comes on song early around 5300rpm and pulls crazy strong through to around 8200rpm

Im using the Sip ultrastrong clutch basket with CR80 plates.

I’m using a combination of the XL and XXL springs but I’m detecting clutch slip so will need to go all in with XXL.

11 hours ago, GiulioEX125E said:

 

Well... VRONE cases surely are nice, with a good intake even if not optimal (ooptimal = bfa intake style, carb pointing backward and reeds pointing forward). Vespower ignition, I dont know, 1.2kg flywheel sounds a little bit too light, considering the lightest largeframe clutches weight around 1kg (Crimaz) or 1.3kg (Sip or standard Piaggio) so its 1-1.3kg on the clutch vs 1.2kg on the flywheel... I dont like that.

 

Anyway, my MHR with stock timings, on LML cases with the intake opened up and a fullcircle crank, with a phbh28 on vforce4 reeds and various box and resonance exhausts, pulled around 21-23 hp and 20-23 nm. Did  you get better results with your setup? Did you dyno it already?

Yeah, fair call. I’ve never dynoed the scooter as here in Australia most of them are setup for powerful road bikes and they aren’t interested in scooters.

Don’t get me wrong, I have struggled with this setup for over a year a couple of things that made a big difference was raising the squish from 0.9 to around 1.2mm

retarding the timing from 18 degrees to around 16 static.

then I was able to lean my jetting on phbh30 

120main

6.5G float

300 float valve 

av266

x7 needle 3rd clip

55pilot

55slide.

sorry I haven’t mentioned my gearing

Standard px200 gearbox with Malossi 23/64 straight cut primary

im also running the laser welded Worb5 flowed reed valve crank, wasn’t sure if this was a good choice and would have preferred a full circle but there was nothing available at the time.

I have a friend with a fully worked quattrini M232 and the 187 is very similar in power, he had his dynoed and it’s peak is around 30hp, 

this is nothing really special in today’s world but what I like is that it’s very reliable and I can run for hours on the freeway with no overheating issues with my cht temperature maxing out at 135degrees celcius. 

You will only see the full benefit of the mhr177/187,

Once you step up to VRONE cases and vespower ignition.

30phbh and a torque based expansion, Sip Camaro as an example 

Bolted onto these cases you won't need to mess with cylinder timings, just ignition timing and jetting