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Old 01-30-2013, 03:57 AM   #61
juames
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I installed a FCR-41 MX on mine and it was fairly straight forward, and I actually got better fuel economy then BST. My BST was ready for an over-haul like yours...lots of worn parts. I'll get between 350-400km before reserve of regular riding. Definitely make the bike more snappy, and feel quicker.
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Old 01-30-2013, 07:15 AM   #62
biensur22
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I'll have to pick up one of those oring kits today when I go out there.

I didn't do a write up, mainly because there's nothing to write. I started with a 170main, 40pilot and an erm needle from sudco. Because the carb I used didn't have a bell on the air box side I had to enlarge its diameter by inserting a 1/2" piece of radiator hose over the top of it, now the air box boot fits snug. It mounted right into the intake boot without problem. Only issue I had were my cables, but that's because my bike was setup for a dellorto phm single cable carb that use different fittings. So I had to modify them for the throttle housing on my bike, but your throttle housing should be plug and play.

All accounts indicate that the fcr will improve your mileage as well as performance, tho I only completed the install 2 days ago and haven't laid down enough track to test it myself. Like I said, mine was complicated because of my particular year 640, but even then the only hiccup was the cable.
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Old 01-30-2013, 08:19 AM   #63
philosobrad
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Just awesome. I picked up an '01 Monday night in Kansas City, the PO had decided to part it out, so I'm in the process of putting it back together. I'm 90% there, but does anyone know where this hooks up:

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Old 01-30-2013, 08:41 AM   #64
Low594
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Quote:
Originally Posted by philosobrad View Post
Just awesome. I picked up an '01 Monday night in Kansas City, the PO had decided to part it out, so I'm in the process of putting it back together. I'm 90% there, but does anyone know where this hooks up:

It hooks to the EPC assembly found on Euro bikes, that appearantly neutered the power in 2nd & 3rd gears, I believe! US models its open to atmospheric air, but tends to suck alot of dust into the upper portion of the diaphragm. Either in the BST40Bible or one of MotoLabs thread there is a K&N part number for a filter to help it out!
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Old 01-30-2013, 09:14 AM   #65
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philosobrad - there is a write up on the filters on the 640 index page.

heres a link to the filters: http://www.amazon.com/Uni-Breather-F...=pd_sim_auto_5

If you scroll down, you see the "frequently bought together" with both filters used in the write up.
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Old 01-30-2013, 11:16 AM   #66
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philosobrad - there is a write up on the filters on the 640 index page.

heres a link to the filters: http://www.amazon.com/Uni-Breather-F...=pd_sim_auto_5

If you scroll down, you see the "frequently bought together" with both filters used in the write up.
Thanks!

Spent the last hour trying to start it. Even with a new battery it spins over too slow to catch. This is using the manual decomp, letting the decomp go after two good spins. The second I let go of the decompressor, it slows to a stop. Aggravating, Looking like I purchased a heap. I managed to get one ear shattering backfire with the decomp pulled in.
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Old 01-30-2013, 11:19 AM   #67
juames
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Thanks!

Spent the last hour trying to start it. Even with a new battery it spins over too slow to catch. This is using the manual decomp, letting the decomp go after two good spins. The second I let go of the decompressor, it slows to a stop. Aggravating, Looking like I purchased a heap. I managed to get one ear shattering backfire with the decomp pulled in.
Need new battery maybe? Need to spin pretty quick to fire up.
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Old 01-30-2013, 12:07 PM   #68
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Need new battery maybe? Need to spin pretty quick to fire up.
Went back out and kicked the hell out of it for about 10 minutes and she fired. Now starts easily with the starter, weird. May have an auto decomp on the way out. Sounds great, and I'm proud to join the 640 ADV ranks. Thanks and sorry for the highjack....winter project proceed :)
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Old 01-30-2013, 12:21 PM   #69
Low594
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Went back out and kicked the hell out of it for about 10 minutes and she fired. Now starts easily with the starter, weird. May have an auto decomp on the way out. Sounds great, and I'm proud to join the 640 ADV ranks. Thanks and sorry for the highjack....winter project proceed :)
I would look at the threads dealing with the starter sprague and starter itself. My starter shaft seal went out and the starter would fill with oil! It still worked, but it wasnt happy!
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Old 01-30-2013, 01:32 PM   #70
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Low594 - cable tube length is 30.5" from plastic receiver on the throttle to the nuts at the carb. There's about 3" of bare cable at each end that go from the nut to the carb and same for the receiver to the throttle tube. (hope that makes sense, if you need more info just ask)

philosobrad - Glad you got it started. I've had a few of those "this bike is junk and I should have just bought a new one moments", in the end I think I'll have a lot of hours into the bike but not a whole lot of money and I hope at the end of this a really awesome bike. But, If its all worth it is up to you.

On that note here are the worn carb plastics (each piece is around about $40 to replace ):





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Old 01-30-2013, 01:53 PM   #71
juames
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Ouch! Check with a company called Motolab, I've heard the sell rebuild kits. Not sure of the price though.
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Old 01-30-2013, 01:58 PM   #72
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juames

I checked with him, seemed like a great resource. His parts are about the same price I can get here, then when shipping from California and customs are worked in... I don't think it would really work out for me. Too bad, he seemed to really know his stuff.
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Old 01-30-2013, 02:05 PM   #73
juames
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juames

I checked with him, seemed like a great resource. His parts are about the same price I can get here, then when shipping from California and customs are worked in... I don't think it would really work out for me. Too bad, he seemed to really know his stuff.
Right...
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Old 01-30-2013, 06:20 PM   #74
biensur22
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FCR! If you're spending over $100 to rebuild the bst, might as well double down and improve the performance.
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Old 01-30-2013, 06:32 PM   #75
gunnerbuck
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Originally Posted by philosobrad View Post
Just awesome. I picked up an '01 Monday night in Kansas City, the PO had decided to part it out, so I'm in the process of putting it back together. I'm 90% there, but does anyone know where this hooks up:

That piece does not hook up to anything, it is a carb vent that contains a filter screen and it normally hangs downward beside the carb...
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