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.

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