Just found this thread, How much does it hang on ? my purple one does it, ....1105 , GPZ pistons, 9oo head, flowed, bigger valves, !000 barrels bored, std cams, rs36's.... tried to sort it several times....Timing, carbs.... gave up... put it down to exhaust (straight through) uninformed thought, but thought it was a back pressure wavelength thing.
Would love it crisp though.
Let me know if you sort it.
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Pigfords OLD effort......now JULES NEW PROJECT!!!!!
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Been having a play - again!
Back with the 38's (145 mains). Haven't touched the bike for weeks - but it started fairly easily.
This time tried altering ignition settings. Tried advancing it a good 10/15 degree's, but still wants to hang up on revs
BUT......
I think it has got to be the lumpy cams...... Thinking about it....
If it holds the revs when you rev it, the throttle stop (thumb screw on the carbs) is probably set a bit to much "open". If the cams are lumpy - they are reknowned for poor idling/slow running.
So I must have to open the slide a bit more than is ideal - and if the slow running system (pilot stuff) isn't spot on, this will exacerbate the situation.
So, when I blip the throttle, the cams come into there own and the revs hang up - as the slides are open a smidge too much!
The bike revs and runs OK - off idle and revs drop if the throttle stop is wound back (so she stalls when throttle shut).
On another point - the Odessey battery I bought a while back is bloody ACE
I charged it up once (when I got it) and I've had a bit of a play around with the bike months ago - kept starting it. The bikes just been left, and switched it on today - and spun up like mad - loads of battery power 
Highly recommended 
Back with the 38's (145 mains). Haven't touched the bike for weeks - but it started fairly easily.
This time tried altering ignition settings. Tried advancing it a good 10/15 degree's, but still wants to hang up on revs
BUT......
I think it has got to be the lumpy cams...... Thinking about it....
If it holds the revs when you rev it, the throttle stop (thumb screw on the carbs) is probably set a bit to much "open". If the cams are lumpy - they are reknowned for poor idling/slow running.
So I must have to open the slide a bit more than is ideal - and if the slow running system (pilot stuff) isn't spot on, this will exacerbate the situation.
So, when I blip the throttle, the cams come into there own and the revs hang up - as the slides are open a smidge too much!
The bike revs and runs OK - off idle and revs drop if the throttle stop is wound back (so she stalls when throttle shut).
On another point - the Odessey battery I bought a while back is bloody ACE
I charged it up once (when I got it) and I've had a bit of a play around with the bike months ago - kept starting it. The bikes just been left, and switched it on today - and spun up like mad - loads of battery power Highly recommended And on the 7th day... Zeds were created!
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Ginger Bear
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Ginger Bear
- Hardcore
- Posts: 6850
- Joined: 16th Dec 2008
- Location: In the Dark.
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............Derrrrrrrr 
Mark
Mine runs 1260, ported head, bigger valves, megacycle cams, 36's, the needles are lifted and a V&H and a ridiculous amount of ignition timing(can't remember what).
It hangs up on throttle return and if I'm at low revs in a higher gear I get pinking.
I just make sure the revs are high enough and ramp the shit out of it.
This is probably of no use what so ever.
Mine runs 1260, ported head, bigger valves, megacycle cams, 36's, the needles are lifted and a V&H and a ridiculous amount of ignition timing(can't remember what).
It hangs up on throttle return and if I'm at low revs in a higher gear I get pinking.
I just make sure the revs are high enough and ramp the shit out of it.
This is probably of no use what so ever.
"Set the GRINDER on it"
on load even at 4000 rpm For some reason 26 deg. advance is ringing a bell
I have heard that the larger vacuum's created by the bigger bore motors tend to pull on the slides so they don't return easily.
Maybe adjusting the return spring may help but it will make for a stiffer throttle and also I haven't checked my throttle closing cable adjustment lately in case this is not doing its job properly.
We could go on the theory of tickover = stationary
Stationary + tickover = no fun
flatnackering it = speed
Speed = fun
Fun always cancels out no fun
Disregard tickover
I don't half talk some Jackson Pollocks
I have heard that the larger vacuum's created by the bigger bore motors tend to pull on the slides so they don't return easily.
Maybe adjusting the return spring may help but it will make for a stiffer throttle and also I haven't checked my throttle closing cable adjustment lately in case this is not doing its job properly.
We could go on the theory of tickover = stationary
Stationary + tickover = no fun
flatnackering it = speed
Speed = fun
Fun always cancels out no fun
Disregard tickover
I don't half talk some Jackson Pollocks
"Set the GRINDER on it"
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