HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
RoosterJ

motorcycle trivia

377 posts in this topic

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??

NO BODY TAKE MY IDEA!!!!!

Share this post


Link to post
Share on other sites

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:

Share this post


Link to post
Share on other sites

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 valves....one of the worst kluge's ever!

Share this post


Link to post
Share on other sites

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:

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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:

Share this post


Link to post
Share on other sites

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:

Share this post


Link to post
Share on other sites

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:

Share this post


Link to post
Share on other sites

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:

Share this post


Link to post
Share on other sites

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:

Share this post


Link to post
Share on other sites

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:

Share this post


Link to post
Share on other sites

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!

Share this post


Link to post
Share on other sites

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:

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0