Hello I am new + XS400 Engine Identification

RHOK

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Hi there I am new

This is my first old school bike - bought an unfinished rat bobber project on a whim as I liked the look of it - will probably regret that decision later

Dude who sold it to me said it was a 1980 XS400 but the plate says it is a XS250 frame

Can someone advise me how I identify what size engine is in the bike whether it is a 250 or 400 cc

Thank you

TC Bros rear hard tail , Honda CRF450 Supermoto wheels, Jawa fuel tank, standard forks, yamaha DT200 front and rear brakes, renthal fatbar, hand made exhaust and mufflers


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Welcome to the forum! Not a bad looking bike. I like the little mufflers. On the right side of the engine as sitting on bike, there is a number stamped in to the case. Use that number and search here from the model.
 
Nice bike. You can also try to ask your Yamaha dealer for info about the number on the engine to find out the year and type exactly (My bike should be 1977 according to info here but dealer found it is 1978).

BTW How the hell did the Jawa (350 Californian) get into Australia?!
 
Nice bike. You can also try to ask your Yamaha dealer for info about the number on the engine to find out the year and type exactly (My bike should be 1977 according to info here but dealer found it is 1978).

BTW How the hell did the Jawa (350 Californian) get into Australia?!

Thank you

I do not know how the Jawa got here - the guy I bought the bike from took the tank of a generator his grandfather had it attached to on the farm and modified it for the yamaha frame
 
I make no claim for having built the bike ( frame wheels etc )

I am just finishing it off - drive line, electrics, cables , lights etc etc

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I remember seeing this come up on ebay, how are you going to go about getting it regoed? does it have an engineers cert?

yes basically an engineers report will show that the frame etc is welded okay , that there is a sprung seat and that it meets the following requirements as listed by the NSW RTA which is bugger all really as motorcycle mods especially on older bikes are easy to pass as long as overall the motorcycle is safe and identifiable

http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CCwQFjAA&url=http%3A%2F%2Fwww.rms.nsw.gov.au%2Fregistration%2Fdownloads%2Fvsi%2Fvsi28.pdf&ei=OPeGU7uRJIfJkQX7oIDABQ&usg=AFQjCNF6FDxWcZ3AhTd1OgHi9Iu8p8MmuQ&sig2=6JAgf0YRqmFQymykMK7KLg&bvm=bv.67720277,d.dGI


2. Wheels and tyres
On all wheels (including any side-car wheel), the tyre size must be suitable for the rim. Each tyre and
rim must be strong enough to support the machine when it is fully loaded. Most major motor cycle
tyre specialists can tell you the right tyre and rim for your machine and the appropriate tyre speed
rating.

4. Mudguards
Mudguards must be fitted to all wheels (including side-car wheels). Each mudguard must be at least
as wide, over its entire length, as its respective tyre.
A front wheel mudguard must cover the rearward section of the wheel through the area between two
lines, one vertical and the other horizontal, both drawn through the centre of the wheel. If suitable
protection is afforded by the frame or other construction of the motor cycle, the front mudguard need
only cover the area that is unprotected.
A rear wheel or side-car wheel mudguard must extend at least from a point vertically above the front
of the tyre to a point vertically above the rear of the tyre. It must be mounted as close as practicable to
the tyre.

7. Frame or suspension modifications
Motor cycle design is a complex task. Before you modify your motor cycle’s frame or suspension, you
should be aware that structural changes to the frame, steering head, front forks, suspension, brakes or
wheels may load vital components well beyond the limits for which they were originally designed; this
will increase the probability of failure and will be a danger to the rider and to other road-users.
The RTA will register a modified motor cycle with a properly designed custom frame, extended forks
and structural modifications but only if submitted with a report from a recognised engineering signatory,
detailing the changes and showing that the changes have not made the cycle unsafe.
It is recommended that you seek the advice of an engineering signatory before the modification is
commenced. Vehicle Standards Information sheet No. 15 “Engineering Signatories” lists engineering
signatories recognised by the RTA.

8. Other requirements
a) If your motor cycle is fitted with a “sissy” bar, it must not extend above the rider’s head and
should not have any sharp points or edges.
b) Motor cycles with no rear suspension (that is, “hard tail”) must have a sprung seat for the rider
and, where a pillion seat is fitted, it must be sprung too.

c) Your motor cycle must be fitted with two braking systems; one capable of acting directly on the
front wheel and the other on the rear wheel. If a failure occurs in one of the braking systems,
then the other system must be operable.
 
now the head stock and forks remain standard on the bike - so does the frame around the engine and the engine mounting points

so this should not be an issue at all with the hard tail or the improved braking system

as for the wheels/tyres well they are "over engineered" for the bike
 
Ahh fair enough thought if its an xs250 frame with a 400 engine and the hardtail for a bike after 1975 it could make things tough but I suppose if you get it engineered anyway it wouldnt matter. Goodluck with the rest of the build!
 
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