The Never Ending Saga - 125cc Sportsbikes Forum

125cc Sportsbikes Forum: The Never Ending Saga - 125cc Sportsbikes Forum

Jump to content


Page 1 of 1
  • You cannot start a new topic
  • You cannot reply to this topic

The Never Ending Saga a new resurrection of a mito that should be dead long time ago

#1 User is offline   Remy 

  • 125cc Sportsbikes Mechanic
  • PipPipPipPip
  • Group: Members
  • Posts: 808
  • Joined: 20-April 11
  • Location:Rijeka-Croatia

Posted 28 July 2020 - 10:46 AM

Hello Gents.
I thought I start a new topic to separate the work done so far and work that will be done now.
this a continuation of this topic: https://www.125ccspo...ic=99378&st=420

reason for a new build is the fact I have moved to Norway. the cheapest way to have the bike was to buy one "for parts" local and then bring all my stuff from home (Croatia / Serbia), but as Covid19 has started it is now put on hold.... but I can slowly gather the parts I know I want replaced.

I plan to keep my old engine, but I run in to a major issue. the availability of parts has decreased so much.
namely I am after inake manifold for a dellorto vhsb 34, so if anyone has it.. shoot :)

I plan to upgrade to VForce 4R reed cage


I thought of introducing the power jet to the VHSB 34 LD carb to help with tuning of it. https://www.jdscustoms.com/product/kan-power-jet-kit/


I need to Helicoil all of the threads in the block as they are really marginal...
and I need to fix the olf sprocket carier as I missed one "spot" so need to correct it (the adaptation of the rs250 wheels)

Wosner or Wiseco piston of a ktm sx200 (or exc 200) as it might be better than Asso werke (discused here https://www.125ccspo...howtopic=147954) the goal is to have a piston weight less than 174g, as

View PostRBmito, on 25 February 2015 - 11:11 AM, said:

It certainly would do any harm opening up the oil-ways would it. But I don't think extra lubrication for the bottom end is the only answer to longevity. Imo. the biggest issue is the extra weight of the piston compared to a 125
DesertGoon has measured some 56mm (std 125) :thumbsup:
Wossner twin ring flat top = 137g
Wiseco single ring flat top = 129g
Asso W single ring flat top = 120g
Mitaka single ring flat top = 130g
Mitaka twin ring dome top = 124g
Rik Ring 56mm = 3g

Polini 64mm twin ring dome top = 174g
Polini Ring = 4g

the wrist pin is also heavier as well compared to the 125

I guess some weight could be taken out of the standard Asso Polini piston, but not enough to make that much noticeable difference I would have thought. The obvious part to modify would be the balancer shaft to counteract the extra piston weight, but by how much. I might have an A level in maths but that was a long time ago & I don't know how it could be calculated.lol.

If someone could do the math then we could be onto a winner

...


#2 User is offline   Remy 

  • 125cc Sportsbikes Mechanic
  • PipPipPipPip
  • Group: Members
  • Posts: 808
  • Joined: 20-April 11
  • Location:Rijeka-Croatia

Posted 28 July 2020 - 11:06 AM

how it started (once again)
https://live.staticflickr.com/65535/50162094711_2bcc4958fa_b.jpgIMG_20200723_183821 by Milos Balunovic, on Flickr

https://live.staticflickr.com/65535/50162345512_1290c697fe_b.jpgIMG_20200723_202937 by Milos Balunovic, on Flickr

https://live.staticflickr.com/65535/50161554518_e75d2cbcdb_b.jpgIMG_20200723_203504 by Milos Balunovic, on Flickr

https://live.staticflickr.com/65535/50162344027_90f2d78fb3_b.jpgIMG_20200723_203510 by Milos Balunovic, on Flickr

https://live.staticflickr.com/65535/50162343607_35526a3fd7_b.jpgIMG_20200723_203513 by Milos Balunovic, on Flickr

https://live.staticflickr.com/65535/50161553768_e900e94452_b.jpgIMG_20200723_203525 by Milos Balunovic, on Flickr


exhaust in beautiful condition
https://live.staticflickr.com/65535/50162093701_360617bc74_b.jpgIMG_20200723_202947 by Milos Balunovic, on Flickr

the original toolset (really unusefull but still https://www.125ccsportsbikes.com/forums/public/style_emoticons/default/heart.png
https://live.staticflickr.com/65535/50161554828_1e1384dba6_b.jpgIMG_20200723_203027 by Milos Balunovic, on Flickr


also finnaly got an unbroken unrepaired front fairing
https://live.staticflickr.com/65535/50162252736_5320cb99b4_b.jpgreceived_396579624652459 by Milos Balunovic, on Flickr
https://live.staticflickr.com/65535/50162501137_f4feee5545_c.jpgreceived_379679499666427 by Milos Balunovic, on Flickr
as both the one i got in titanium and my old one, and heaps other i see also miss the top part going around the windscreen

#3 User is offline   Remy 

  • 125cc Sportsbikes Mechanic
  • PipPipPipPip
  • Group: Members
  • Posts: 808
  • Joined: 20-April 11
  • Location:Rijeka-Croatia

Posted 28 July 2020 - 04:42 PM

The piston data.
https://live.staticflickr.com/65535/50162718583_9c6c1496fe_b.jpgalternative piston by Milos Balunovic, on Flickr
it will need shortening to fit properly. still trying to find some info on the actual weight. slightly higher pin to head distance is solved easily by a thicker gasket (metal)

This post has been edited by Remy: 28 July 2020 - 04:43 PM


Share this topic:


Page 1 of 1
  • You cannot start a new topic
  • You cannot reply to this topic

1 User(s) are reading this topic
0 members, 1 guests, 0 anonymous users