Page 176 of 213 FirstFirst ... 76126166174175176177178186 ... LastLast
Results 2,626 to 2,640 of 3183

Thread: Oddball engines and prototypes

  1. #2626
    Join Date
    20th January 2010 - 14:41
    Bike
    husaberg
    Location
    The Wild Wild West
    Posts
    11,823
    Derbi narrow angle twin 1971 version
    Click image for larger version. 

Name:	derbi2.JPG 
Views:	51 
Size:	116.0 KB 
ID:	341715Click image for larger version. 

Name:	derbi1.JPG 
Views:	46 
Size:	64.6 KB 
ID:	341716
    check out the lower part of the float bowl
    Click image for larger version. 

Name:	PA-2011_Derbi125GP-005.jpg 
Views:	132 
Size:	171.1 KB 
ID:	341717Click image for larger version. 

Name:	derbi.JPG 
Views:	46 
Size:	181.1 KB 
ID:	341718

    1967 version
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  2. #2627
    Join Date
    13th June 2010 - 17:47
    Bike
    Exercycle
    Location
    Out in the cold
    Posts
    5,624
    Looks like heavy float chamber castings - to change the natural vibration frequency of the solid mounted carbs ?
    Wonder if the carb bodies and mounts stood up to the extra weight...

    The early version has swill pots fitted which is not common. Main float chamber is very far forward of the mainjet, the additional swill pot effectively makes the mainjet central in a "virtual bowl". Should eliminate problems caused by fuel surge on acceleration or braking.

    I remember Jennings writing about adding weight to Dellorto SS1 float chambers to stop fuel frothing problems on a 250 Aermacchi single.

  3. #2628
    Join Date
    20th January 2010 - 14:41
    Bike
    husaberg
    Location
    The Wild Wild West
    Posts
    11,823
    Quote Originally Posted by Grumph View Post
    Looks like heavy float chamber castings - to change the natural vibration frequency of the solid mounted carbs ?
    Wonder if the carb bodies and mounts stood up to the extra weight...

    The early version has swill pots fitted which is not common. Main float chamber is very far forward of the mainjet, the additional swill pot effectively makes the mainjet central in a "virtual bowl". Should eliminate problems caused by fuel surge on acceleration or braking.

    I remember Jennings writing about adding weight to Dellorto SS1 float chambers to stop fuel frothing problems on a 250 Aermacchi single.
    I think its a bigger well for the float bowls.
    https://www.kiwibiker.co.nz/forums/a...7&d=1556606425

    the edge make it almost look like a fabrication although it seems to be no weld near the std bowl
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  4. #2629
    Join Date
    20th April 2011 - 08:45
    Bike
    none
    Location
    Raalte, Netherlands
    Posts
    3,341
    Quote Originally Posted by WilDun View Post
    I also would like to know a little more about this bike - I believe it to be a (pretty unusual) works 500 Jawa.
    [/ATTACH]Attachment 341703Attachment 341704Attachment 341705Attachment 341706
    I have always appreciated Jawa designs, which is more than I can say for this contraption. I find it hard to believe that it came out of the Jawa factory looking like this.
    So I doubt that it is a works Jawa.

  5. #2630
    Join Date
    13th June 2010 - 17:47
    Bike
    Exercycle
    Location
    Out in the cold
    Posts
    5,624
    Quote Originally Posted by Frits Overmars View Post
    I have always appreciated Jawa designs, which is more than I can say for this contraption. I find it hard to believe that it came out of the Jawa factory looking like this.
    So I doubt that it is a works Jawa.
    So do I. The engine is a road single cam version. You can see the flanges on the RHS of the crankcase for the road motor outer cover.
    My guess is a home built special - with a nod to the works in the use of square tubing, lol.

    Ken MacIntosh built a much nicer one for a customer. I've seen it written up in I think a Classis Bike mag Husa.
    I remember going with my father to look at a road 500 Jawa thet he was negotiating to buy off a notorious hoarder here in ChCh.
    The sale fell through which was a pity as it was a nice rarity in NZ.

  6. #2631
    Join Date
    13th June 2010 - 17:47
    Bike
    Exercycle
    Location
    Out in the cold
    Posts
    5,624
    Quote Originally Posted by husaberg View Post
    I think its a bigger well for the float bowls.
    https://www.kiwibiker.co.nz/forums/a...7&d=1556606425

    the edge make it almost look like a fabrication although it seems to be no weld near the std bowl
    I reckon they're a pair of one-off castings. Looks to me like the pattern for the chamber has simply had a ring added to it.
    They've been cleaned up after casting by machining the OD - but there's still a ragged edge there.
    Given how hard a stepped pattern for the inside would be, I'm picking the add-ons are solid.

  7. #2632
    Join Date
    20th January 2010 - 14:41
    Bike
    husaberg
    Location
    The Wild Wild West
    Posts
    11,823
    Quote Originally Posted by Grumph View Post
    I reckon they're a pair of one-off castings. Looks to me like the pattern for the chamber has simply had a ring added to it.
    They've been cleaned up after casting by machining the OD - but there's still a ragged edge there.
    Given how hard a stepped pattern for the inside would be, I'm picking the add-ons are solid.
    I found some more pics
    i are not convinced either way but as we have access to Jan he will know as it appears the IRZ carbs were used into his era with Derbi and mabye others. ")
    Click image for larger version. 

Name:	derbi732.jpg 
Views:	59 
Size:	30.7 KB 
ID:	341719Click image for larger version. 

Name:	derbi-motorcycles-5.jpg 
Views:	71 
Size:	68.1 KB 
ID:	341720Click image for larger version. 

Name:	irz std.jpg 
Views:	52 
Size:	140.7 KB 
ID:	341721Click image for larger version. 

Name:	plug and spanner.jpg 
Views:	54 
Size:	46.1 KB 
ID:	341722

    Quote Originally Posted by jamathi View Post
    That is true Frits.
    But I had 2 cylinders cast with the bottom of the exhaust as high as the transfers top.
    The last 5 years all our exhaust ducts were CNC machined.
    With many variations!
    During the last year the exhaust bottom was 3mm above BDC.
    Paging Jan
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  8. #2633
    Join Date
    10th February 2005 - 20:25
    Bike
    1944 RE 1
    Location
    Auckland, New Zealand.
    Posts
    2,243
    Quote Originally Posted by Frits Overmars View Post
    I have always appreciated Jawa designs, which is more than I can say for this contraption. I find it hard to believe that it came out of the Jawa factory looking like this.
    So I doubt that it is a works Jawa.
    I think those pics originated in Australia, where seems that it's up for sale at the moment - be in quick or you'll miss it! - Still as I said somewhere else a while ago .... I hate to see anyone's dream going down the gurgler, good or bad. ........ At least they tried and made an effort!
    Strokers Galore!

  9. #2634
    Join Date
    13th June 2010 - 17:47
    Bike
    Exercycle
    Location
    Out in the cold
    Posts
    5,624
    Quote Originally Posted by WilDun View Post
    I think those pics originated in Australia, where seems that it's up for sale at the moment - be in quick or you'll miss it! - Still as I said somewhere else a while ago .... I hate to see anyone's dream going down the gurgler, good or bad. ........ At least they tried and made an effort!
    Fair enough Will. Either someone will buy it for what it is now or as the basis for a more conventional build. Some good bits in there.
    Like the curate's egg - good in parts, LOL.

    We've had similar things come up for sale here in NZ. I hate to see well - known NZ specials gutted for maybe a 7R or manx engine and box. The history is lost.

  10. #2635
    Join Date
    10th February 2005 - 20:25
    Bike
    1944 RE 1
    Location
    Auckland, New Zealand.
    Posts
    2,243
    Quote Originally Posted by Grumph View Post
    Fair enough Will. Either someone will buy it for what it is now or as the basis for a more conventional build. Some good bits in there.
    Like the curate's egg - good in parts, LOL.

    We've had similar things come up for sale here in NZ. I hate to see well - known NZ specials gutted for maybe a 7R or manx engine and box. The history is lost.
    Yes This sort of thing should definitely be preserved as near as possible to how it was originally conceived, (no matter what it might look like now!).
    Usually these gems are left behind (under the bench) by some guy who was totally misunderstood by the family and when he passed on, the remaining family couldn't see beyond having a tidy garage! so out they went! They were after all only built to make a dream tangible if nothing else ......... Perhaps I'm drawing too much from my own experiences - I'm misunderstood too you see!-

    But, here's a case in point!
    He could be a great designer by now, a stuntman, a comedian, or manager of a big Corporation - One just never knows! - does one?
    Click image for larger version. 

Name:	50224061_2199456630106999_883969965336559616_n.jpg 
Views:	69 
Size:	88.0 KB 
ID:	341752

    Look at a certain guy on our TV ads - He has a very successful Real Estate sales company and likes to be in all his his ads, the most recent one being about him turning up to the office on his road bike all immaculately dressed etc. - how many people would write him off as just another poser? - but then, how many people would realize that he was 350cc NZ champion (twice?). - you just never know! (probably wasn't him who built the machine in the picture though!).
    Strokers Galore!

  11. #2636
    Join Date
    24th July 2006 - 11:53
    Bike
    KTM 890 Adventure
    Location
    Wgtn
    Posts
    5,541
    Motion to evict WilDun from KB henceforth due to savage and unprovoked visual assault on members delicate technical sensibilities!
    Go soothingly on the grease mud, as there lurks the skid demon

  12. #2637
    Join Date
    10th February 2005 - 20:25
    Bike
    1944 RE 1
    Location
    Auckland, New Zealand.
    Posts
    2,243
    Quote Originally Posted by Ocean1 View Post
    Motion to evict WilDun from KB henceforth due to savage and unprovoked visual assault on members delicate technical sensibilities!
    EH? - Translation into modern English please! - That's how I was taught at school, but I dropped out and bought myself a bike (motorbike that is) instead! - Since then, I have always thought that was much better decision than staying on to learn bloody Shakespeare! - and ........ I'm really a very sweet and gentle person and those are all lies! so there! ....... I don't know - honestly!

    Seriously, - You must admit that pic. does have a certain " no Bullshit" element about it!
    Strokers Galore!

  13. #2638
    Join Date
    24th July 2006 - 11:53
    Bike
    KTM 890 Adventure
    Location
    Wgtn
    Posts
    5,541
    Quote Originally Posted by WilDun View Post
    Seriously, - You must admit that pic. does have a certain " no Bullshit" element about it!
    Who can tell? You'd never see it for the wall to wall birdshit.
    Go soothingly on the grease mud, as there lurks the skid demon

  14. #2639
    Join Date
    10th February 2005 - 20:25
    Bike
    1944 RE 1
    Location
    Auckland, New Zealand.
    Posts
    2,243
    :

    I must admit that it could have a slight birdshit element about it!
    Strokers Galore!

  15. #2640
    Join Date
    20th January 2010 - 14:41
    Bike
    husaberg
    Location
    The Wild Wild West
    Posts
    11,823
    Quote Originally Posted by WilDun View Post
    Yes This sort of thing should definitely be preserved as near as possible to how it was originally conceived, (no matter what it might look like now look like now!).
    Usually left behind under the bench by some guy who was totally misunderstood by the family and when he passed on, the remaining family couldn't see beyond having a tidy garage! so out they went! They were after all only built to make a dream tangible if nothing else ......... Perhaps I'm drawing too much from my own experiences - I'm misunderstood too you see!-

    Case in Point!
    He could be a great designer by now, a stuntman, a comedian, or manager of a big Corporation - One just never knows! - does one?


    I mean look at a certain guy on our TV ads - He has a very successful Real Estate sales company and likes to be in all his his ads, the most recent one being about him turning up to the office on his road bike all immaculately dressed etc. - how many people would write him off as just another poser? - but then, how many people would realize that he was 350cc NZ champion (twice?). - you just never know! (probably wasn't him who built the machine in the picture though!).
    Is that from an albatross colony or something cause it covered in avian Guano
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

Thread Information

Users Browsing this Thread

There are currently 3 users browsing this thread. (0 members and 3 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •