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Dragbike!

Started by FJ1100mjk, January 19, 2016, 06:51:27 AM

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FJ1100mjk

January 19, 2016, 06:51:27 AM
Saw this posted in the Cyber World and snagged it. With its USD front end and radial front brakes, it looks to be a current drag bike. Thought someone here might know about it.

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gumby302ho

#1
January 20, 2016, 10:56:15 PM
 Well, whatever clutch setup this guy is running, I want in! :crazy:

JMR

#2
January 21, 2016, 01:13:57 AM
Quote from: gumby302ho on January 20, 2016, 10:56:15 PM
Well, whatever clutch setup this guy is running, I want in! :crazy:
A slider I'd imagine.

Earl Svorks

#3
January 28, 2016, 12:55:01 AM
  Do you s'pose the outrig plate over the countershaft  sprocket has a bearing to take some of the drive load ? I'm certain this machine makes some serious torque.
   Simon

Pat Conlon

#4
January 28, 2016, 01:37:44 AM
Yep, the torque loads are extreme...that's a big wide fat meatball of a rear tire and that output shaft is quite long to get the counter shaft sprocket out far enough so the chain lines up with the back sprocket.
Something's got to support the free end of the output shaft (unlike our street bikes)
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

carey

#5
January 28, 2016, 07:52:10 AM
Years ago, there was a member on the old forum with a user name of BigT or JoeT, that was into drag racing.   He rented a drag track in the Rochester, NY area for a day so he and his friends could play.  I went to watch and saw several bikes, similar to the one above, launch.  All I can say is wow. 

Since the track was rented and not official competition, the safety rules were somewhat relaxed.  I could stand right next to the start area.  I think it was only 1/8 mile, but if you blinked they were gone and at the end of the strip.

JMR

#6
January 28, 2016, 03:26:24 PM
 It's nice to see an FJ engine in there as all the older engines I have seen are Kawasaki's and Suzuki's. :biggrin: It's tough to get a lot of HP out of the FJ engine compared to the other two. The large valve angle limits the size of the valve you can put in there. The FJ top end is basically a copy of the Honda DOHC minus the Honda's goofy cam drive system. I do not see many Honda DOHC's at Man Cup events either. :scratch_one-s_head: :biggrin:
Hines got an FJ to be competitive in ProStock but I heard that Yamaha sent him blank head castings and he machined the guide holes/angle, 3 plug holes etc.
I love the FJ as an engine as it is simple and pretty durable. Assembling a Honda CBX engine will really make you appreciate the FJ engine. :good2:
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