Malossi mhr cylinder tune...

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225worb
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Tue Sep 11, 2018 12:29 pm

I'm running a stroked malossi 210, on a pinasco Reed cases..vforce reeds, reed crank, one off pipe, sip lc head, I want some more power!!!
What can I expect from going from the old phbh30 to a flat slide Dellorto?
And who would be a choice to fettle the cylinder ..???

cgt75b
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Wed Sep 12, 2018 12:55 pm

Hi mate

Give Harry Barlow a ring at Pro porting regarding the cylinder if you can get through to him mind!

The best of luck.

Cgt75b

Jack221
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Tue Sep 18, 2018 4:46 am

The MHR 57 on your 60 crank will go like a heavily fettled old 210, straight out the box. Just bolt it on and set it up. I fitted this set up on my 221 after the old 210 wore out, a few months ago and now it rides like a motorbike. Goes over 8000rpm on a 35 tooth 4th. No gear gaps, pulls like a train.
Vespa est ieiunas, quia semper operaturi

Norrie Bodge
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Tue Sep 18, 2018 10:17 pm

Fettle the piston as worb5 do on there tunes, makes a great increase to performance

Norrie Bodge
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Tue Sep 18, 2018 10:24 pm

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225worb
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Tue Sep 18, 2018 10:45 pm

I'm using the mhr 60mm cylinder single piston modified, v force reeds, ported barrel base matched to the ported pinasco Reed cases, one off pipe, higher gearing with bgm forth (it use to rev out in forth with the old gear kit)
Pulls like a fella in a brothel... want more power... Harry's ultra busy..


..

Jack221
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Wed Sep 19, 2018 5:29 am

Opening the piston windows Is a given. Same as taking off the sharp edges and dressing the ports. Forgot to mention that. The Vertex piston seems way easier to do than the Asso. Much nicer.

225Worb, The 60mm MHR cylinder is a bit tame. The 57mm cylinder is more aggressive. Might be cheaper than Harry too.
Vespa est ieiunas, quia semper operaturi

225worb
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Wed Sep 19, 2018 11:57 am

Why would the mhr 60mm be tamer than the 57mm mhr ???

225worb
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Wed Dec 12, 2018 10:01 pm

Nope still no answer..

I've used both and your clearly wrong !!! with fettling i've gained massive amounts power and fun using the 60mhr....

Jack221
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Thu Jan 17, 2019 6:44 am

The MHR60 comes out tame, as it is similar to the MHR57 with the 1.5mm difference fixed at the head. The only way to make the MHR60 go like the 57 on a 60 is to fettle it. As you have found out once fettled the story can change entirely. What durations did you end up with?
Vespa est ieiunas, quia semper operaturi

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