motorcycle trivia

376 replies to this topic
  • RoosterJ

Posted July 08, 2004 - 12:38 PM


:thumbsup: In what year did honda have a reed block {reed valves} in a xr 500 ? :devil:

  • BIGMatt

Posted July 08, 2004 - 01:11 PM


Do I win a prize if I get it right?? Or is this a serious question?

Id say mid-late 70's when they called a 2-stroke CR500 a XR500.
No properly designed 4-stroke engine would ever use a 'reed block'. Although its possible, it'd have to be on the intake side only, and have real valves for the exhaust side. I bet it'd rev pretty high, and have sweet throttle response!
MMMMMmmmm??? Maybe I could patend this idea??

  • Guest_dsornot2ds_*

Posted July 08, 2004 - 01:31 PM


you would have to figure out how to keep the reeds from opening when they're not supposed to on a 4-stroke. I'm personally wondering why they haven't figured out a way of using electric valves instead of mechanical ones. I bet a whole lot of top heavy weight can be removed with no cams, no cam chain, no tensioners, hmmmmmm :thumbsup:

  • RichBaker

Posted July 08, 2004 - 02:21 PM


78-82, IIRC, they used it so they could run more overlap. It really killed top-end though, too restrictive....
They used it in addition to the normal intake of the worst kluge's ever!

  • RoosterJ

Posted July 08, 2004 - 02:40 PM


Good answer Rich. Just a few months ago i made this discovery. I before that point would have betted 100 bucks that no four stroke had ever--been built with reeds. and actualy boysen sells a kit for these applications. ordered a stator to day for the wr, wanted a rotor puller tool, but it was like they had a run on them ( i told him why } he also asked if i was sure my stator was bad? Da :thumbsup:

  • jwriott

Posted July 08, 2004 - 02:42 PM


I'd love to see a picture or specs of a 1978 XR500. :thumbsup:

As far as I know, they made the 23" front wheel, XR500 from 1979 thru. 1980 and 1979 was the first year.

  • RoosterJ

Posted July 08, 2004 - 04:39 PM


The clymer manual has a pic. but no specs. and dude you gave away my second trivia question. peace love & rock and roll. the rooster j :thumbsup:

  • jwriott

Posted July 08, 2004 - 05:14 PM


Here's some Honda info. I wouldn't trust Clymer to be correct on years. :thumbsup:


  • RoosterJ

Posted July 09, 2004 - 01:46 AM


You are right on that. dig the twin carbs on the 83, and why they didnt put a pumper carb on the xr in 81 is crazy instead the xl had it. yamaha question coming this evening. :thumbsup:

  • YamahaWR450FMike

Posted July 09, 2004 - 02:47 AM


I believe Yamaha was the first to come out with the reed valve for a 2-stroke engine in 1972

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  • RoosterJ

Posted July 09, 2004 - 06:16 AM


You could be quite right on that, i have a 70 dt-1 and 73 setting here later one has reeds early dont. I belive they called that TORQUE INDUCTION . the small 100cc enduros made a funny sucking sound when they ran if i recall correctly. we will be talking TT 500 this afternoon. :thumbsup:

  • rekless

Posted July 09, 2004 - 07:44 AM


AAHHH, TT 500 was my first bike...can't wait! That bike was a hemorrohoid factory. Rear had like 2" of travel, and OOOOOHHHHHHH...that sweet metal tank !!! :thumbsup: :devil: :awww:

  • RoosterJ

Posted July 09, 2004 - 08:56 AM


O.k. i couldnt wait any longer, here you go. dont actually know year model maybe the later years of production, on the head, was a sight glass something on the same order as the one on a cluth cover what was its function? :thumbsup:

  • jwriott

Posted July 09, 2004 - 09:18 AM


A way of finding TDC?

  • RoosterJ

Posted July 09, 2004 - 09:44 AM


:Dyou're dead's actually called the kick indicator! :thumbsup:

  • RoosterJ

Posted July 09, 2004 - 12:49 PM


That last one was to easy, here goes one more. In bruce browns film on any sunday the desert racer that burned up his yamaha what size was the bike? {maybe too easy} :devil: :thumbsup:

  • YamahaWR450FMike

Posted July 09, 2004 - 02:49 PM


well I know this cause I used to have a 1972 Yamaha DT 360 that was just crazy on power. It was way scary. That 360 engine with the reed valve was just a rocket ship! I'll never forget the power that thing had!

  • RoosterJ

Posted July 09, 2004 - 03:13 PM


are you talking about the reed valves? or answering the last trivia question? did your dt 360 engine ever run backwards? still looking for answer on yellow bike question. :thumbsup:

  • RoosterJ

Posted July 09, 2004 - 04:48 PM


I guess every body had to watch the movie to get this answer. or nobody really cared about the prize.

  • Eddie Sisneros

Posted July 09, 2004 - 05:00 PM




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