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Post by Curtis on Apr 21, 2015 10:57:54 GMT -5
More than likely you can go to any hydraulic shop and get either brass/steel/aluminum pipe plugs for them
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Post by zambia on Apr 21, 2015 11:30:32 GMT -5
More than likely you can go to any hydraulic shop and get either brass/steel/aluminum pipe plugs for them Thanks for the suggestion Curtis - I hammered a hardwood dowel into the opening and patted myself on the back...a couple of red-line runs later...one the dowels was gone. I pulled that plug and found it to dangerously lean - I suppose an exhaust leak can do that...but man it happened in the space of about 10km. I now have chrome acorn nuts in place..look a bit goofy but it should stop further leaking.
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Post by zambia on Apr 21, 2015 11:33:17 GMT -5
Hi. If it idle a bit lean, but four strokes at small throttle openings, you should have a look at your needle jet and cut away. Is your cut away 2.5? What is your needle jet? P6? What needle? The slide cut away is 2.5 and I wrote down the jet needle info (it's at home). My concern is that since these carbs are so tight to fit in the valley behind the cylinders, I might have compromised the flange seal by pulling them and off...so my lean idle might be coming from that situation.
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Post by Curtis on Apr 21, 2015 12:47:18 GMT -5
You can get Permatex flange sealant, it is gas and oil resistant, if you need something like that.
I would also suggest using a proper plug instead of a wooden dowel,
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Post by zambia on Apr 21, 2015 14:07:33 GMT -5
You can get Permatex flange sealant, it is gas and oil resistant, if you need something like that. I would also suggest using a proper plug instead of a wooden dowel, Thanks Curtis - I used gasket maker last time but I'm not sure it's fuel resistant - if I can't find flange sealant, I might try 3 Bond. The wooden dowels are covered by acorn nuts now so I think I'm ok...I put a little blue thread lock on to create a better seal. Amazingly the 1/4" or so of wood that protruded into the head pipe, burned off in about a minute!
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Post by zambia on May 23, 2015 20:16:53 GMT -5
I've been battling 1/8 throttle 4-stroking and decided to try an even smaller pilot. I went with a 30 and it definitely helped with small throttle openings...I'm a bit worried about being lean off the start - it does bog a tiny bit. Is there any risk here?
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Post by JA-Moo on May 23, 2015 23:31:46 GMT -5
You can always adjust the air screw a bit, and maybe a .020 shim for the needle.
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Post by speedgeeza on May 24, 2015 10:31:44 GMT -5
Hmmm... I'd be a little suspect of starting off lean, especially on a dyno. Years ago, I used to work for a fella in the evenings and the odd weekend who's business was dyno tuning. In return, I got the use of a very quick Norton Commando. His rolling road was a Heenan and Fround, type water brake. He bought it from the bankrupt Norton Villiers Triumph creditors. (He also had a SUN Systems resistance type brake but preferred the displacement brake) Anyway, he was very knowledgeable in my opinion (which may not be worth much) and a very good rider. He was accused of cheating in the IOM production race riding a GPZ900R after braking the lap record. A strip inspection of the bike proved his innocence. ANYWAY!!! (I do tend to go on a bit...) He would set up the mixture at a known rich condition and then come down on jet size until the engine was singing. Apart from reducing the risk of a seizure under load, it supposedly really reduced the risk on the over run after a "pull", to calculate the total drag for a CBHP figure. I don't recall ever seeing an engine seize on his dyno, but Youtube has a few videos of just such a scenario when things go awfully quiet, awfully quickly!
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