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Author Topic: 1997 BMW F650ST to F650R: Enduro Hellride Conversion  (Read 8301 times)

Offline irk miller

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #50 on: Jan 08, 2018, 15:29:13 »
This is the bike the PHM40 comes stock on.  Not sure why you guys are questioning the carb.




Offline irk miller

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #51 on: Jan 08, 2018, 15:57:30 »
You don't automatically get drastic gains from a pumper.  Oftentimes, they're marginal.  Fuel efficiency is guaranteed to go down drastically, though.  This motor is built to be efficient.  I'm okay with going away from the CV carb to sacrifice some gas mileage for performance gains.  But, I think a pumper has less to offer in total gain.  I question how much difference throttle response will actually be.  I plan to put a lot of road miles on this bike.  It's not for pure off road.  A pumper carb sucks on a road bike for fuel economy. 

Online Hurco550

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #52 on: Jan 08, 2018, 16:22:56 »
This is the bike the PHM40 comes stock on.  Not sure why you guys are questioning the carb.


I wasn't saying the phm40 was a bad choice, just wondering why pass by the fcrmx. Strictly out of curiosity for me.

I will say though, in my personal experience with the dr650, the power gains from the fcr over the stock cv were massive and only a 7% average drop in mpg, and that's with about 1500 miles on the road on the fcr. I'm weird, I figure up mileage every time I fill up on everything I own lol

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"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj

2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennett

Offline irk miller

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #53 on: Jan 08, 2018, 16:47:55 »
I wasn't saying the phm40 was a bad choice, just wondering why pass by the fcrmx. Strictly out of curiosity for me.

I will say though, in my personal experience with the dr650, the power gains from the fcr over the stock cv were massive and only a 7% average drop in mpg, and that's with about 1500 miles on the road on the fcr. I'm weird, I figure up mileage every time I fill up on everything I own lol

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That’s comparing to a CV. How much HP gained over a non-CV, non-pumper? 


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Online Hurco550

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #54 on: Jan 08, 2018, 16:52:15 »
That’s comparing to a CV. How much HP gained over a non-CV, non-pumper? 


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Couldn't tell you that, not sure.

Sent from my SM-G920V using Tapatalk

"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj

2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennett

Offline cxman

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #55 on: Jan 08, 2018, 17:14:46 »
"power gains from the fcr over the stock cv were massive and only a 7% average drop in mpg,"

that is why you run the pumper you can run it to the lean side all the way thru the curve and tweak both the shot and the nozzle on the pump to deliver a powerstroke shot

for power increase with out richening the overall mixture

« Last Edit: Jan 08, 2018, 17:17:09 by cxman »
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline irk miller

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #56 on: Jan 08, 2018, 18:30:00 »
I wasn't saying the phm40 was a bad choice, just wondering why pass by the fcrmx. Strictly out of curiosity for me.
I didn't like the FCR on the DR, to be honest.  I never got that bike's tune sorted out.  But why I chose the Dell'Orto was because there's a boatload of information for Dell'Orto PHM carbs on Rotax motors.  Husky and Husaberg runs them.  BMW ran them on the R90S. Guzzi runs them.  Ron Woods Racing actually runs Mikuni TM45's on their DS650 Rotax motors.  I'm only in $60 for this Dell'Orto, plus whatever it costs to tune it.  I'm just fucking around at this point.  Nothing is off the table.  I may go to the TM next.  I loved the TM carb on the DR.  I know Ski-Doo and Arctic Cat run TM40s on their 600 and 800cc 2 stroke motors.

Offline irk miller

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #57 on: Jan 10, 2018, 00:32:04 »
One side of the tank mod is done...




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Offline Ryan Stecken

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #58 on: Jan 10, 2018, 05:43:25 »
One side of the tank mod is done...




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Looking good irk!
May I ask how you welded that piece in and which material you used?

Thanks!

Offline irk miller

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Re: 1997 BMW F650 El Diablo Hellride
« Reply #59 on: Jan 10, 2018, 07:32:52 »
Looking good irk!
May I ask how you welded that piece in and which material you used?

Thanks!

Thanks.  Oxy/Acetylene with a #0 torch tip.  The sheet metal patch is 18ga vs whatever thinness the Honda tank is.  I'll try to match the hole a little better on the other side, so hopefully my welds end up neater.  It's been 20 years since I last did this.  LOL