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Post by nickj on Jan 30, 2012 23:36:13 GMT
I have a few jets kicking around for the phbl size so before your rush off ordering give me a bell/pm Thanks Nick. Have you got any 5mm pilot jets: 50, 52, 55? Shane gave me a 47 pilot, but I'm not sure if it's enough - I think I had a 50 in my 19/19! will check tomorrow and let you know..think I've got something in that range
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Post by bluebadge on Jan 30, 2012 23:37:11 GMT
are you adjusting the mixture screw with the motor running ? you need to do this how the hell do you do that with a phbl carb in the body Drill a hole thorugh the side or twist the carb sideways...or is there some other clever trick...... I put a hole in the side of my last bike. I could easily adjust the idle and mixture screw with a long small flathead.
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Post by jonnysnatchsniffer on Jan 31, 2012 8:10:34 GMT
i drill holes in the side too, but you reallly need it running so you can listen for the change in engine when you adjust it, id find it pretty nigh on impossible to take the carb out adjust the screw 1/8th turn and notice a difference and therefore set it up well when it running it might take 3-4 seconds to notice the change and for it to settle
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Post by Jimmy D on Jan 31, 2012 9:08:32 GMT
i drill holes in the side too, but you reallly need it running so you can listen for the change in engine when you adjust it, id find it pretty nigh on impossible to take the carb out adjust the screw 1/8th turn and notice a difference and therefore set it up well when it running it might take 3-4 seconds to notice the change and for it to settle Yeah I've thought of a trick just now (as was again trying to adjust it this time with a penknife...) Get one of those removable flathead screw tips you get with the "all in one" screwdriver sets and set it in some modelling putty shaped like a key, making it as narrow as possible. Then you have a little key to turn the screw with... ....or, yes, drill a hole in my frame ;D This morning I was getting this: 1) Get it up to 45mph 2) Slow down, roll off throttle 3) Revs stay quite fast (not that fast, just faster than needed to hear the 'putt putt putt') 4) After 6-7 seconds revs are dropping down to a steady pace 5) Once or twice revs dropped so far it stalled That's with the idle screw 3.5-4 turns out. So I'm going to get a 50 or 52 jet (thanks Nick) and see if that plays more nicely than the 47.
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Post by smallframescott on Jan 31, 2012 11:22:59 GMT
How many scooter boys does it take to set a carb up ? Why are you going down in jets just could you took the room air off ?? The main jet does the last 1/4 The frist 1/4 is pilot jet The needal and atomiser is the bit in the middle But they all cross over a little bit Put a bigger pilot jet in When you come of the gas it to lean that why is revving up You fucking about with the main jet where are you testing this in London so where are you get on the main jet full gas in 4th not in london we used to test on the west way only place you can go flat out , the ram air is not like most fillters it will run the same with it on or off Same jet I run I bike with one and without one same were on kit carb in side not allot of shut get in there I no cannot spall for shit but hope this helps ?? ?
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Post by Jimmy D on Jan 31, 2012 11:32:13 GMT
How many scooter boys does it take to set a carb up ? Why are you going down in jets just could you took the room air off ?? The main jet does the last 1/4 The frist 1/4 is pilot jet The needal and atomiser is the bit in the middle But they all cross over a little bit Put a bigger pilot jet in When you come of the gas it to lean that why is revving up You fucking about with the main jet where are you testing this in London so where are you get on the main jet full gas in 4th not in london we used to test on the west way only place you can go flat out , the ram air is not like most fillters it will run the same with it on or off Same jet I run I bike with one and without one same were on kit carb in side not allot of shut get in there I no cannot spall for shit but hope this helps ?? ? I'm not going down in jets anywhere...? Don't worry about main jet, 100 was bogging down when throttle wide open and really revving but changed for 96 and it's fine. Testing on the A3 between Roehampton and Wandsworth, fine to test going flat out there apart from the 1 speed camera The RAMair is a good filter, yes, but not when it's crushed to 1cm thick because it doesnt fit in the PK frame! Thanks for confirming what I thought, when I come off the gas it's lean. So just need to go larger on the pilot and I should be all sorted Main point we are discussing is how to turn the mixture screw while engine running to get pilot right, as on PHBL it's not a thumbscrew.
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Post by smallframescott on Jan 31, 2012 13:36:17 GMT
You don't have to do it wile it runing start a 1 1/2 out 1/4 turn in or out what size pilot jet you got now
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Post by Jimmy D on Jan 31, 2012 14:02:38 GMT
You don't have to do it wile it runing start a 1 1/2 out 1/4 turn in or out what size pilot jet you got now 47, i started at 1 1/2, quarter turn out each time, got to 4 turns out and it's still not perfect...
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Post by smallframescott on Jan 31, 2012 15:02:40 GMT
Your setup is like what do for a good road bike I'm runing a 55 pilot 3/4 out? Rev drop down nice and pick up to
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Post by skajosh on Jan 31, 2012 16:55:28 GMT
Hope i don't get this much of a hassel with my 25 PHBL
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Post by Jimmy D on Jan 31, 2012 18:42:33 GMT
Hope i don't get this much of a hassel with my 25 PHBL It's not hassle, mate - it's just getting the jetting right! And if I were you I'd order a load of jets right from the start, otherwise you'll spend ages waiting for new ones to arrive in the post just to try them out. As everyone has said, no engine is quite the same and it's unlikely you'll be able to just drop it in and go
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Post by skajosh on Jan 31, 2012 19:04:48 GMT
Well ive got my carb on order, should be here tomorrow hopefully Ill find out what jets are already in and then order some. Gonna start with a 105 on the main and work down hopefully.
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Post by nickj on Feb 1, 2012 8:25:53 GMT
I have a few jets kicking around for the phbl size so before your rush off ordering give me a bell/pm Thanks Nick. Have you got any 5mm pilot jets: 50, 52, 55? Shane gave me a 47 pilot, but I'm not sure if it's enough - I think I had a 50 in my 19/19! checked the jets I have and haven't got a spare idle jet in that range. Think I have a 55 in my running carb...you can borrow that if you want to try it as the engine isn't in a scooter at the moment
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Post by Jimmy D on Feb 1, 2012 9:37:41 GMT
Thanks Nick. Have you got any 5mm pilot jets: 50, 52, 55? Shane gave me a 47 pilot, but I'm not sure if it's enough - I think I had a 50 in my 19/19! checked the jets I have and haven't got a spare idle jet in that range. Think I have a 55 in my running carb...you can borrow that if you want to try it as the engine isn't in a scooter at the moment Thanks for looking Nick - don't worry, I think a 50 will do it so going to order a couple from beedies and have a tinker at the weekend
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