Posted by The Older Gentleman on September 25, 2007, 2:19 am
> So you probably have the #27.5 idle jets. B
Coo, he's morphed again.
--
BMW K1100LT 750SS CB400F CD250 CB125 SL125
GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3
BOF#30 WUSS#5 The bells, the bells.....
Posted by Dave on September 25, 2007, 10:13 am
>>Bike is a 1980 XS650.
> Someone else I knew explored the top end of his XS, and turned
> it into a Britbike killer, but it cost a head, valves, exhaust system,
> cam and pistons, and many portraits of Ben Franklin.
There's a web page (650 central maybe) which has got instructions to convert
the XS650 from a 360-degree to an 83-degree offsite firing angle. I thought
about doing it, retooling the cam, new ignition, at that point you even
start thinking about a retooled head with larger valves, etc. But the cost
quickly put that idea to rest. the exhaust is, I think, only 1-1/4"
headers, and I've also seen people who have upsized the pipes and intake air
flow to squeeze some more power out.
Dave S.
Posted by chateau.murray@btinternet.com, on September 25, 2007, 11:28 am
> There's a web page (650 central maybe) which has got instructions to convert
> the XS650 from a 360-degree to an 83-degree offsite firing angle. I thought
> about doing it, retooling the cam, new ignition, at that point you even
> start thinking about a retooled head with larger valves, etc. But the cost
> quickly put that idea to rest. the exhaust is, I think, only 1-1/4"
> headers, and I've also seen people who have upsized the pipes and intake air
> flow to squeeze some more power out.
And just re-throwing the crank wouldn't improve power on its own -
just make it smoother. As you say, you'd need to carry out all the
tuning work after doing the crank, timing and cam changes.
XS650s are very easy to tweak anyway, and the engine is incredibly
strong, so you've no need to worry about blowing the thing up.
Posted by Dave on September 25, 2007, 1:35 pm
> XS650s are very easy to tweak anyway, and the engine is incredibly
> strong, so you've no need to worry about blowing the thing up.
Ah, but if you start messing with larger valves and higher lift cams some of
your bullet-proof-ness gets lost.
Posted by The Older Gentleman on September 25, 2007, 2:15 pm
> >
> > XS650s are very easy to tweak anyway, and the engine is incredibly
> > strong, so you've no need to worry about blowing the thing up.
> >
>
> Ah, but if you start messing with larger valves and higher lift cams some of
> your bullet-proof-ness gets lost.
Believe me, an XS650 has got enough of that Magic Ingredient to spare.
--
BMW K1100LT 750SS CB400F CD250 CB125 SL125
GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3
BOF#30 WUSS#5 The bells, the bells.....
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