tzr 125 engine

[dlatch]

Hello
after trying out my retro fitted elec power valve on the early 2rk engine which works to a point but due to the size difference of the powervalve compared to the later 4DL head can only tune it so much.
so now what i wonder is can i fit a 4DL head to my 2RK bottom end.
i would switch straight to a complete 4DL engine but the rear mounting points are not the same which would mean moving and re welding.
So has anyone tried this mod 4DL head to 2RK bottom end also does anyone know any companies that could rebuild mine and supply/fit a 4DL head. pref south east area.
regards
duncan

[ben350]

Are you sure that the rear mounts are different??

The Belgarda 4DL top end will fit but you will also need the CDI / carb and exhaust to make it run properly.

Why not just get a servo motor that fits properly from another 2RK?
____________________
Ducati 996 Biposto
Suzuki Goose 350
DT125R Supermoto (Project)

[dlatch]

hi ben
the CDI i have now will run the servo (early 3 wire type) but the rear mounts on the case are def different to the later 4DL engines which i believe also have extra clutch plate and elec start hence i guess the case revisions over the earlier model.
i did look at the athena kits but they only list one for the 4DL engines and not the early one.
need to get hold of a 4dl barrel and try it out i guess

[element]

thats weird cos thats like saying a dt125re engine (which is the same as the 4dl) has different mounts to say an 89 dtr engine (which is the almost the same as a 2rk)..i could fit a fit a dt125re engine into my 89 dt cos the mounts are the same..

confused


anyway just get a pv from a pre 2003 DT-R? should bolt in (*should* but the TZR is slightly different from a DT head. I have a 91 TZR and a 89 DT-R)
____________________
04' DT125RE (run-a-bout) // 89' DT125R (rebuilt + supermoto conversion)
SPARES FOR SALE. 2RK TZR // 82 DR125 // DT125R/E .... PM ME...

[dlatch]

heh

mounting points on DT case is again completley different to tzr
(various years)
my engine is from a 1989 tzr
the early fixed type powervalve is way smaller than the later elec servo controlled version.
will get somep ics of my spare engine tomorrow maybe someone can post 4dl version to compare
been trawling around to try and find a 4dl barrel but no luck so far

[ben350]

Not calling you a liar but I had an early 4DL a couple of years back and the mounts looked the same. I cant see Yamaha making a different set of casing for just one model TZR on my 4DL there was a wee steel sub frame that bolted onto the engine and allowed it to fit into the TZR250 frame (250RC) that Yamaha Belgarda had used to make a trick euro style 125.

Post up pics
____________________
Ducati 996 Biposto
Suzuki Goose 350
DT125R Supermoto (Project)

[dlatch]

ben
we talking early engine vs later 4DL model
difference to the case being electric start and extra clutch plate and obviously the elec servo on the head.

the head mounting was exactly same as early engines and the bottom mount looked same but top rear mount on case was definatley different maybe there is a adapter cradle to fit into TZR but mines fitted to a monkeybike so that won't help me
eitherway i don't need elec start and not fussed about extra clutch plate as monkey is very light so the early bottom end suits me.
So now i am on the look out for a 4DL barrel and head if anyone has one available

[element]

https://cgi.ebay.co.uk/tzr-125-r-full-engine_W0QQitemZ220381627662QQcmdZViewItemQQptZUK_Motorcycle_Parts?hash=item220381627662&_trksid=p3286.c0.m14&_trkparms=72%3A1689%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318
____________________
04' DT125RE (run-a-bout) // 89' DT125R (rebuilt + supermoto conversion)
SPARES FOR SALE. 2RK TZR // 82 DR125 // DT125R/E .... PM ME...

[dlatch]

yeah i spotted that element sadly too skint atm
looks a bargain too

[dlatch]

https://i43.tinypic.com/15gq9mt.jpg

ok got a 3mb barrel for the grand sum of £8
from 1990 DT124R
now i understand these are not the plated type so i can just get rebored, i strip head off my 2RH engine and it fits fine and is same height as the 2Rk barrel so with the 2RK head mounted on top my mounting points on frame won't be affected and i gain the much larger power valve you can see the difference in the porting between the two heads very easy.
now the issues i have is the part of barrel that fits inside the case is different compared to the old one and prob 6mm longer, does not foul anything but it does stick into the inlet hole, should i get this machined to match old barrel and i assume i will need the 1990 DTR piston to match the different tuning in the barrel.

any ideas guys?
cheers
duncan