to use the later black plastic type. White plastic examples were used on the production racers; they are
equally good. Watch out incidentally for Dunstall banjo bolts which have a restrictor to prevent over oiling-
used in the days before inlet guide oil seals to reduce oil consumption. Remember that the head is oil
cooled as well as air cooled. I/ you must use early all metal feeds (perhaps on your all standard Dommi)
their please use Tinmans solder and flux from your hardware shoppee, not electronic flux cured solder, as
it isn't strong enough. Similarly, for any repairs or alterations to tire nil feed/return banjo at back of liming
chest.
ODD ITEMS
Head gaskets Don't forget to aneal the copper one on first and every re-use. Heat to red all over quench
in water.
Shimming: Equal gap both sides cuts down low frequency shaking.
Head gaskets: Some people when following the Service Manual find that a replaced blowing head gasket
goes again within 100 miles or so, the reason being omission to re-tighten the head bolts after 50 miles.
Clutch drag: Following the Service Manual has you putting engine oil into the primary case, this tends to
cling onto the clutch plates causing drag. After a good clean of the plates, refilling with Castrolite or
similar lightweight oil is preferred.
Worn exhaust, port threads: these are very often caused by allowing the nuts to come loose, but they are
stopped from failing out by those rattley tab washers. The whole issue then vibrates and clatters,
knocking out the threads. Cure for worn threads can be to have sleeves fitted, but a very much
recommended method is steel helicoils ; the thread is then better than new.
Any trouble with sleeve gear bushes can he checked as follows: check primary chain tension with a finger
and with other hand haul tip and down on rear chain. Any change in primary chain tension spells trouble
If there are rumbles when clutch is operated it could be clutch centre bearing going dodgy.
Diagram 4, Timing side crankcase showing holes
for 850 breathing, See page 14.
FORK YOKES: 750 - - Engine
Nos. 221545-221644 and
230536230685, 850 – all. All
these had the revised steering
geometry by new (850) frame
064140. Also new fork yokes
004078 (lower) 064080 (upper
with stem) the yokes must be
used in pairs. Do not mix old
and new ones. The factory re-
lease states also do not fit old
yokes to late frame or vice
versa. T.R.S. states this was
due to lack of knowledge of the
effect. See Page 24
12
DRILL 3/8 Holes
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