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Dave F Mod

Started by Diablo007, October 18, 2020, 04:48:31 AM

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Diablo007

Anyone have a pdf on the Dave F mod?  The link on Economy Cycle's site is dead and I can't seem to find them via a Google search.
2 stroke junkie:
Too many motorcycles to list.  The highlights:
1973 Yamaha RD350 Cafe Racer project; 1983 Suzuki RG250 YammaGamma project; 1988 Yamaha YSR50/80 project; 1984 Yamaha RZ350; 1984 Yamaha RZ500

m in sc

i just pdf'd this. I have had this forever. keep in mind, its dated. but the carb mods are still accurate. http://www.2strokeworld.net/forum/index.php?topic=2566.0

:cheerleader:


Economy Cycle John

Quote from: Diablo007 on October 18, 2020, 04:48:31 AM
Anyone have a pdf on the Dave F mod?  The link on Economy Cycle's site is dead and I can't seem to find them via a Google search.

I fixed that link and here's some additional instructions / Pictures

https://files.secureserver.net/0sxTWBlyTWlOB6

John
www.EconomyCycle.com - RD/RZ Parts, Services, Tools, Accessories & Swag

Diablo007

2 stroke junkie:
Too many motorcycles to list.  The highlights:
1973 Yamaha RD350 Cafe Racer project; 1983 Suzuki RG250 YammaGamma project; 1988 Yamaha YSR50/80 project; 1984 Yamaha RZ350; 1984 Yamaha RZ500

quocle603

Do not underestimate the power of a two-stroke.

1975 Yamaha RD350 (modified), 1973 Yamaha RD350 (stock), 1971 Suzuki T500, 1981 Yamaha XS650 HS2, 1982 Honda MB5, 1980 Puch Maxi, 1979 Puch Magnum, 1993 Tomos Bullet, 2003 Malaguti Firefox F15 LC

NYSingh

I recorded when I had to do the mod on a new carb recently and finally just uploaded it.  I didn't show the removing/re-installing of the mains/pilots/needle jet/jet needle since those are simple enough to figure out using the PDF.  The first time I did it I struggled most with the brass ball (and I still did, as shown in the video!), so I focused on that portion. Please chime in if I've mis-stated anything in the video so I can post a corrected version.

Also re-attaching the PDF


1976 RD400C (SpecII pipes, K&N Y-boot, Dave F Mod, Team Scream Racing Stage-1 Porting)
Moto Guzzi V7III

quocle603

 :clap: for those visual learners
Do not underestimate the power of a two-stroke.

1975 Yamaha RD350 (modified), 1973 Yamaha RD350 (stock), 1971 Suzuki T500, 1981 Yamaha XS650 HS2, 1982 Honda MB5, 1980 Puch Maxi, 1979 Puch Magnum, 1993 Tomos Bullet, 2003 Malaguti Firefox F15 LC

rodneya

There was something about cutting down the little piece that sticks into the carb by 2mm that I dont see in the pdf. I think it was something that Chuck mentioned

NYSingh

Per Dr Q:

QuoteI use 169-P2's and cut the spray shroud 1.7mm.
210's on the mains will about right.
I always start with 35 pilots on Spec II PIPES.
I'm usually also using my TSR/Barlow boost bottle/Banshee manifolds and yz125 reed petals on the stock cages.
So your on the right track. Don't cut the P0's if you use them.
5DP7--2 or 3 is good on a 2.0 airjet.

This was for a ported RD350 w JL pipes.  Someone else in the thread mentioned 2.0mm for the RD400.

http://www.2strokeworld.net/forum/index.php?topic=136.msg705#msg705
1976 RD400C (SpecII pipes, K&N Y-boot, Dave F Mod, Team Scream Racing Stage-1 Porting)
Moto Guzzi V7III