Author Topic: Drag Bike / The Big 4 Express. (Read 65981 times)

Don R · « **Reply #75 on:** January 29, 2014, 09:50:11 PM »

I got an O ring today I was 50 miles from home and stopped in an industrial supply house. He had only a special high temperature O ring he orders in special for Alcoa. I'm sure he uses that same story on every jerk that comes in for 1 o ring and needs it bad. End result, I paid $12 for one, but I'm tired of driving all over looking for one. I did buy the harbor freight kit and no, it's not in this one. Probably in the non metric kit though. At that price the harbor freight kit would cost over $4500. WAhahahah.

Don R · « **Reply #76 on:** January 29, 2014, 09:51:38 PM »

Oh yeah, the counter guy has a 550 he bought new and rides all the time. Still got me for $12.

Terry in Australia · « **Reply #77 on:** January 30, 2014, 01:56:59 AM »

You should have used the old one Don, it wouldn't have leaked.

Don R · « **Reply #78 on:** January 30, 2014, 07:29:05 AM »

You are correct sir. I was going to re-use it until my brother talked me out of it. Now I'll have more oil pressure at high temperatures because I have a genuine alcoa spec high temp. O ring.

Terry in Australia · « **Reply #79 on:** January 31, 2014, 12:45:37 AM »

Quote from: Don R on January 30, 2014, 07:29:05 AM

You are correct sir. I was going to re-use it until my brother talked me out of it. Now I'll have more oil pressure at high temperatures because I have a genuine alcoa spec high temp. O ring.

In your dreams.............

Don R · « **Reply #80 on:** January 31, 2014, 08:02:39 AM »

Sorry, I forgot to raise the sarcasm flag. Polishing spokes and wheels nothing to see here folks, move along.
I got tires for the sandcast bike bought / the front mounted. The rolled edge rim that was on the dragbike got returned to the sandcast bike, it had a little rust inside and the shop was about to use duct tape for a spoke protector, I brought it home unmounted.

MoMo · « **Reply #81 on:** January 31, 2014, 08:28:50 AM »

back in the old enduro days we always used tape on the inner rim spokes rather than a rim strap-less likely the tape would fail, also made a tire change easier with the rim locks. Do you have an estimated time of completion Don?...Larry

754 · « **Reply #82 on:** January 31, 2014, 08:57:52 AM »

Terry you better learn to thread. One of the coolest most satisfying things to do on a lathe..
Don you don't need much travel and servitude up very stiff.. Better reaction times and less wheelie prone.

..geez that autocorrect is goofy
Second last sentence should read,
Don you dont need much travel and set it up very stiff..

Terry in Australia · « **Reply #83 on:** January 31, 2014, 08:13:05 PM »

Quote from: 754 on January 31, 2014, 08:57:52 AM

Terry you better learn to thread. One of the coolest most satisfying things to do on a lathe..
Don you don't need much travel and servitude up very stiff.. Better reaction times and less wheelie prone..

I know Frank, I suffer terribly from machine thread envy...............

Don R · « **Reply #84 on:** January 31, 2014, 09:32:12 PM »

I've neglected this thread, I've been on performance all day begging for aluminum rod bolt torque numbers. I was warned to check the crank so I pulled it and had it magnafluxed. Looked good, it showed the expected lines at the ends of the welds. My machinest told me beforehand that the ends of the welds would show a smooth line.
The greedy dog charged me all of Ten dollars, including cleaning it. He must have heard about the $12 O ring and felt bad for me.

My timeline may falter, Next month (march) I need to rework the chassis side 4 link brackets on my dragster. I made the bolt holes too loose and when it goes around a corner in the pits with no differential the suspension bolts pop back and forth in the slack. You swear the chassis was broken under the seat. We have chrome moly profile machined doubler plates to weld onto the brackets with properly clearanced bolt holes. They auctually use them when there is no problem too.

Oh thanks for the encouragement and info. It always helps to know we're not alone in this.

Don R · « **Reply #85 on:** February 02, 2014, 07:00:07 PM »

I stretched the rod bolts .005 to establish the torque setting per big Jay's help. I re-checked the rod bolt after a stretch to be sure it didn't fail. It went back to its normal length. The newer rod bolts have a centering hole for the stretch gauge to fit into. Older ones are harder to do without help. I lost a thou. on the gauge when I reached for the camera. Pic lost to the bucket

Don R · « **Reply #86 on:** February 03, 2014, 08:41:48 PM »

Extreme rotor lightening! And it hasn't been on the lathe yet! I want to remove 1/4" from the OD. round the edges. Turn the outside face down to the ends of the screws and taper the hub from the face to the OD of the washer under the bolt.
No alternator but there will be a starter drive for the cb900F starter.

Jerry Rxman Griffin aka MuthaF'er · « **Reply #87 on:** February 03, 2014, 09:50:06 PM »

So are you removing the rotor and just making a base for the starter clutch??

Don R · « **Reply #88 on:** February 04, 2014, 08:10:13 AM »

Yes, that's the plan. No charging system, only starting. It's still a drag bike engine, I just want it to self start. The PO used rollers, that's problematic for a tribute/ car show bike. Possibly an easy pass on track or a tribute pass down main street like Tom used to do.

The PO snapped the end off a crank once and warned me to lighten any rotor on a high performance engine. Even an 836.
My plan is, an LED head and tail light, magneto ignition and a very limited street range.

Don R · « **Reply #89 on:** February 06, 2014, 03:47:22 PM »

With the lower frame rails under the engine location level, the neck is 38 degrees from vertical. The swingarm goes up to the rear axle. Shocks too long, my struts are too short. The forks are shortened 2 1/4", they can be lengthened as needed to allow for weight. F2 header for reference. The Drag pipes will be too low since they stack up, maybe with mods they could work.

Don R · « **Reply #90 on:** February 06, 2014, 03:56:29 PM »

2 1/2" of ground clearance to the pipes, not made for corners. Ideas or opinions? This isn't the original drag bike frame but it looks bad ass. Will the rake add high speed stability?

Bill/BentON Racing · « **Reply #91 on:** February 06, 2014, 05:01:50 PM »

Don, did you get the swingarm pics,RC Clubfoot?

Bill

Don R · « **Reply #92 on:** February 06, 2014, 06:07:06 PM »

Quote from: Bill/BentON Racing on February 06, 2014, 05:01:50 PM

Don, did you get the swingarm pics,RC Clubfoot? Bill

I did, they got lost in the shuffle. cool. Did you get any wheelie bar pics? I'll send a PM.

Terry in Australia · « **Reply #93 on:** February 07, 2014, 07:39:11 PM »

That's a cool frame Don, with that rake and the longer swingarm it will be extremely stable at high speeds mate, for sure! It'll be very slow to steer in corners obviously, but as a straight line weapon, it'll be unbeatable. I like that blue tank too, nice color. Cheers, Terry.

Don R · « **Reply #94 on:** February 07, 2014, 08:32:28 PM »

Thanks Terry, that frame was the cheapass project I started when I was getting back into Hondas. After I found a nice K0 with Lesters for $600, it went on the wall for a few years.

Terry in Australia · « **Reply #95 on:** February 07, 2014, 09:02:04 PM »

No worries mate, if you find a good unmolested diecast K0 frame, let me know? It's the only part in my jigsaw puzzle that's still missing. Cheers, Terry.

Don R · « **Reply #96 on:** February 08, 2014, 07:31:38 AM »

Don R · « **Reply #97 on:** March 02, 2014, 10:04:52 PM »

The 16" wheel is laced and trued, not as difficult as expected. The 5" x 16" M&H slick is mine now. I drilled the rotor, put in new wheel bearings and polished the front rim.
Both of the bikes from the PO looked horrible but he had sprayed anything silver with WD40 and heavy coated everything else with turtle wax. All the dirt and oil made them look like they were corroded bad but underneath they're beautiful.
The engine is unsplit but not fully re-assembled.
This is the date I had set to begin readying the race car for use this season. Maybe next week.

Terry in Australia · « **Reply #98 on:** March 02, 2014, 10:18:23 PM »

Good job Don, don't forget the pics! Cheers, Terry.

Terry in Australia · « **Reply #99 on:** March 16, 2014, 11:38:40 PM »

Nice work Don. Have you seen Frank's (754) post about using a Suzuki Swinger so you can use a fat rear tire? Hey that Frame that you can't get a title for isn't a K0 frame is it? Cheers, Terry.

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Author Topic: Drag Bike / The Big 4 Express. (Read 65981 times)