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Post by jjn123 on Oct 6, 2019 18:32:48 GMT
I have a 74 primavera all stock except Malossi vespower 12v electronic ignition. Im noticing a little leakage from the head. Friend of mine said cylinder is “ify” at the lip. I don’t want to go crazy with upgrades.
Is it worth getting the dr10 kit and just up jet the main? Would I have to reset the timing as well?
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Post by jjn123 on Oct 6, 2019 18:52:36 GMT
Typo - I meant dr130 kit
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Post by triffid on Oct 14, 2019 15:57:37 GMT
dr130 is pretty plug and play with slight change to jetting if required, no need to change timing.
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jayn
Automatica
Posts: 7
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Post by jayn on Oct 19, 2019 13:23:04 GMT
Think it’s worth $150? Would I notice any difference without doing any other mods?
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Post by dazzz on Oct 20, 2019 11:06:43 GMT
Did you lap the head if not you need to try that.
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jayn
Automatica
Posts: 7
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Post by jayn on Oct 21, 2019 0:42:00 GMT
I did lap the head. It’s running pretty good now. I just want a little more oomph but don’t want to go crazy with upgrades. I seem to top out at 42mph. Slowww.
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Post by sdjohn on Oct 24, 2019 17:57:59 GMT
If you are running the 2 port top end still, you will definitely like the improvement from the DR130. It was one of the first things I did when I bought my 74 primavera.
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Post by tzsteve on Oct 25, 2019 15:11:48 GMT
what is the stroke of the engine you are running
if its not 51mm you will need to strip and swap the crank
this is also a good time to open up the inlet port a touch
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jayn
Automatica
Posts: 7
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Post by jayn on Oct 26, 2019 15:10:08 GMT
If I do it I’m thinking:
Dr130 head
Polini kidney exhaust
Upjet
Done.
Not planning on porting. I just want a little more oomph and I think that will do it. Yes?
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Post by tzsteve on Oct 26, 2019 15:51:37 GMT
that will clock about 60 to 62 so count it as high 50`s
that's a nice speed for tootling around and good on the juice
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jayn
Automatica
Posts: 7
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Post by jayn on Oct 26, 2019 18:37:16 GMT
If I remember correctly I set timing to be 23 degrees btdc when I installed melossi vespower electronic ignition. Would I have to change that or will be be ok with the new set up?
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Post by leon on Oct 29, 2019 14:22:53 GMT
I had my DR at 17 degrees. Was originally at 19 but was firing far too early and over heating.
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jayn
Automatica
Posts: 7
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Post by jayn on Oct 30, 2019 20:00:34 GMT
17 ha? Does the dr kit tell you what it should be set at?
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Post by sdjohn on Nov 9, 2019 21:44:17 GMT
If I remember right the DR calls for stock et3 timing (21?).
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Post by vespistazd on Nov 10, 2019 17:29:50 GMT
I have a DR130 very bad finishing touch on the head and cylinder...its good repacement for original cylinder but i wouldnt recomend it to anyone...give few extra dollars and buy a polini cast iron and i wont have to bother with head and cylinder leak all the time...also i left my timing on original PK50 mark on the case, seems to work fine
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