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Author Topic: Dolmar RS7900 Unlimited  (Read 999 times)

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Offline chy_farm

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Re: Dolmar RS7900 Unlimited
« Reply #10 on: May 05, 2017, 05:22:45 pm »
Quote from: mdavlee . on May 04, 2017, 10:29:46 pm
Will it go past 13.5k?
Hello Mdavlee, if this is to me I would say she sounds she reaches 13500 rpm or over, but it's just by means of my hearing, not with digital tacho, I do not have it.
Chy
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(McCulloch) PM6,PM320,SP40,PM484,10-10A,PM610,35A,47,300,450,PM800,1-70,1-80,740,740(mod),795,SP125C
(Echo) CS-302,CS-502EVL,CS-60S,CS-601S VL,CS-803EVL,CS-803EVL(mod),CS-651T
(Homelite) DM 50,Super Mini S,Super XL-9225,Super 1050
(Partner) 1614/Mini P,R417T,S55,R14T,R12,R12,K12S,
(Stihl) MS-180C,08S,070AV,084AV
(Shindaiwa) Pecker A110,E305AV
(Dolmar) 123,PS 7900
(Jonsereds) 49SP,455
(Husqvarna) 550XP
(Tanaka) TCS-33EDTP
(Makita) EK-900
(Alpina) A40

Offline chy_farm

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Re: Dolmar RS7900 Unlimited
« Reply #11 on: May 05, 2017, 06:51:58 pm »
Showing a couple of her coils, each one is for 7900 but seems to have a tad different resistances for the secondary coils. Seems they are both "red coil", but I did not know there are two types.
Chy
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(McCulloch) PM6,PM320,SP40,PM484,10-10A,PM610,35A,47,300,450,PM800,1-70,1-80,740,740(mod),795,SP125C
(Echo) CS-302,CS-502EVL,CS-60S,CS-601S VL,CS-803EVL,CS-803EVL(mod),CS-651T
(Homelite) DM 50,Super Mini S,Super XL-9225,Super 1050
(Partner) 1614/Mini P,R417T,S55,R14T,R12,R12,K12S,
(Stihl) MS-180C,08S,070AV,084AV
(Shindaiwa) Pecker A110,E305AV
(Dolmar) 123,PS 7900
(Jonsereds) 49SP,455
(Husqvarna) 550XP
(Tanaka) TCS-33EDTP
(Makita) EK-900
(Alpina) A40

Offline chy_farm

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Re: Dolmar RS7900 Unlimited
« Reply #12 on: May 05, 2017, 07:19:26 pm »
She also got a bore-up kit, which converts her bore 52mm to 54mm, so it calculates 27 x 27 x 3.14 x 37 =84.7cc.
Chy
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(McCulloch) PM6,PM320,SP40,PM484,10-10A,PM610,35A,47,300,450,PM800,1-70,1-80,740,740(mod),795,SP125C
(Echo) CS-302,CS-502EVL,CS-60S,CS-601S VL,CS-803EVL,CS-803EVL(mod),CS-651T
(Homelite) DM 50,Super Mini S,Super XL-9225,Super 1050
(Partner) 1614/Mini P,R417T,S55,R14T,R12,R12,K12S,
(Stihl) MS-180C,08S,070AV,084AV
(Shindaiwa) Pecker A110,E305AV
(Dolmar) 123,PS 7900
(Jonsereds) 49SP,455
(Husqvarna) 550XP
(Tanaka) TCS-33EDTP
(Makita) EK-900
(Alpina) A40

Offline chy_farm

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Re: Dolmar RS7900 Unlimited
« Reply #13 on: May 05, 2017, 07:26:14 pm »
And added a modification to the timing, 2 degrees advanced. For the first trial I gave her 7degrees in advance but it was too much.
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(McCulloch) PM6,PM320,SP40,PM484,10-10A,PM610,35A,47,300,450,PM800,1-70,1-80,740,740(mod),795,SP125C
(Echo) CS-302,CS-502EVL,CS-60S,CS-601S VL,CS-803EVL,CS-803EVL(mod),CS-651T
(Homelite) DM 50,Super Mini S,Super XL-9225,Super 1050
(Partner) 1614/Mini P,R417T,S55,R14T,R12,R12,K12S,
(Stihl) MS-180C,08S,070AV,084AV
(Shindaiwa) Pecker A110,E305AV
(Dolmar) 123,PS 7900
(Jonsereds) 49SP,455
(Husqvarna) 550XP
(Tanaka) TCS-33EDTP
(Makita) EK-900
(Alpina) A40

Offline chy_farm

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  • Karma: 24
  • Location: Yokohama, JAPAN
Re: Dolmar RS7900 Unlimited
« Reply #14 on: May 05, 2017, 09:54:41 pm »
Showing a view of modified flywheel below, I said 2 degrees advanced but it looks to be a tad more, 3 degrees?
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(McCulloch) PM6,PM320,SP40,PM484,10-10A,PM610,35A,47,300,450,PM800,1-70,1-80,740,740(mod),795,SP125C
(Echo) CS-302,CS-502EVL,CS-60S,CS-601S VL,CS-803EVL,CS-803EVL(mod),CS-651T
(Homelite) DM 50,Super Mini S,Super XL-9225,Super 1050
(Partner) 1614/Mini P,R417T,S55,R14T,R12,R12,K12S,
(Stihl) MS-180C,08S,070AV,084AV
(Shindaiwa) Pecker A110,E305AV
(Dolmar) 123,PS 7900
(Jonsereds) 49SP,455
(Husqvarna) 550XP
(Tanaka) TCS-33EDTP
(Makita) EK-900
(Alpina) A40

Offline mdavlee .

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Re: Dolmar RS7900 Unlimited
« Reply #15 on: May 06, 2017, 08:57:23 am »
Quote from: chy_farm on May 05, 2017, 05:22:45 pm
Quote from: mdavlee . on May 04, 2017, 10:29:46 pm
Will it go past 13.5k?
Hello Mdavlee, if this is to me I would say she sounds she reaches 13500 rpm or over, but it's just by means of my hearing, not with digital tacho, I do not have it.
Chy
If it never breaks up like a real hard 4 stroke then it's unlimited
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Offline Cut4fun .

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Re: Dolmar RS7900 Unlimited
« Reply #16 on: May 06, 2017, 10:33:19 am »
Nate sells that red maroon coil flywheel set.  I am betting limited since here.  010038143 IGNTION   Part Superseded From:DOL, 010038141

https://performanceoutdoorequipment.com/products/dol-010038143-igntion-assembly-cpl-ps-7900

pic

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