November 7th, 2007
250cc Eligible Machines
Posted in IHRO News, Technical |I haver been asked by a number of riders to suggest machines which would be eligible for the proposed 250cc IHRO class
The obvious choices for 2 strokes are
Greeves Silverstone
Royal Enfield GP5
Cotton Telstar
Bultaco TSS
CZ Junior
Ossa
Montesa
Maico
Jawa
MZ (?)
4 strokes
Ducati
Aermacchi
Morini
Mondial
I will keep working on the list or anyone can add to it. I am thinking about a weight limit of 85Kgs, does this seem reasonable?
Link to original 250 class post
Hi Graham,
85Kg are not the reasonable weight limit for a Maico RS125 or some other little two strokes… 75Kg is the right weight limit.
The class is intended for 250 NOT 125 but of course suitable 125s will be allowed to race as now
I suggest 85 Kgs for 250cc and 75 Kgs for under 200cc
hi Graham,
a little addition to your two stroke list:
- Aermacchi “Aletta Oro 125″
- MZ “RE 125″
the MZ “RE 250″ is a two cylinder
as an owner of several genuine 2 stroke machines is that i will expect problems with the cz junior (= type 677).
many replica’s are made now, with cross engine (type 680) a genuine 250 will give around 36 hp, but the cross engine are much stronger, because this are cilinder etc built until the eighties. the same problem as the ajr.vs bultaco.
for the jawa no replica’s with watercooling are build, only aircooled. these are not fast enough.
i will compete with a jawa 675 (watercooled 1965) or a CZ junior 677.
Dear Harry
If these replicas are like the AJR with extra ports then they will not be eligible for IHRO competition
I will only come with genuine race bikes (for the 2 strokes with 5 ports cilinders.
The engines of the CZ are built until the late seventies with different porttiming and number of ports.
But in competation the good guys will suffer from the bad!
See you all in coming season
regards