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by Tim Allman
Mon Sep 05, 2016 5:46 pm
Forum: Brakes | Exhaust | Suspension | Maintenance
Topic: Shielded vs Unshielded Bearings
Replies: 10
Views: 4460

When I was an apprentice auto mechanic about 1970 I used to replace wheel bearings (tapered bearings on the front wheels with drum brakes) often. I was told to pack the bearings with grease which makes sense but also to pack the inside of the hub with grease up to the level of the outer bearing race...
by Tim Allman
Sun Sep 04, 2016 5:56 pm
Forum: Honda Dream - CA72 | CA77 | CA78
Topic: 1961 C72 on eBay
Replies: 8
Views: 3515

Sometimes I feel like I could kiss the Honda designers and other times I could kick them in the ass. The toolkit is good enough to rebuild the bike (kiss) but without a pump you are stuck on the road shoulder (kick). I suppose that cost is the prime motivator but through the period that the CB72s et...
by Tim Allman
Sun Sep 04, 2016 12:06 pm
Forum: Honda Dream - CA72 | CA77 | CA78
Topic: 1961 C72 on eBay
Replies: 8
Views: 3515

It's beautiful. Is that tire pump a standard item?
by Tim Allman
Fri Aug 26, 2016 12:29 pm
Forum: Motors - 247cc | 305cc | 337cc | 350cc
Topic: Question about pistons/bores
Replies: 12
Views: 5144

And Tim, the second part of your answer should have been obvious to me. Not to worry, it won't be my last stupid question! I have taught at the high school and university levels and one of the first things that I say to my new students is that any question asked in good faith to obtain information ...
by Tim Allman
Thu Aug 25, 2016 12:31 pm
Forum: Motors - 247cc | 305cc | 337cc | 350cc
Topic: Question about pistons/bores
Replies: 12
Views: 5144

Let me give you a little nicer answer to a reasonable question but I will use the CB77 bore and stroke for calculation. The displacement of a cylinder bored to standard bore is 3.0 * 3.0 * pi * 5.4 = 152.7 cc. If it is bored to 1 mm diameter (0.5 mm radius) oversize the displacement is 3.05 * 3.05 *...
by Tim Allman
Thu Aug 25, 2016 7:32 am
Forum: Carburation - Fuel
Topic: chinise carburator !!!
Replies: 3
Views: 2519

I love the brand name moulded into it: KeiKhinkt. Although you can't see inside, the quality of the moulding and machining on the flange is poor to say the least and leaves me wondering if the insides are just as cheaply done. There are reasons that it is so inexpensive and low Chinese wages are onl...
by Tim Allman
Sat Aug 20, 2016 3:45 pm
Forum: Honda Superhawk - CB72 | CB77 | CP77 | CBM72
Topic: Pirsig's Zen bike has resurfaced.
Replies: 13
Views: 8372

I have to admit to being envious but that hardly describes it. That bike and the guy who rode it have been of profound effect in my life and it's great to see the bike. I should add that recently I decided that Zen needed another reading but my copy had deteriorated greatly because it was printed on...




 

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