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Post by Bozzy on Jul 27, 2013 22:47:31 GMT 1
Did a plug chop on pv. Problem is if I go up on main I get misfire crap running 4 to 6 k lifting Ederle gives same so currently it's running better that is ever run...but not sure if they look a little white. On 280 main with gutted airbox needle 1 down. Standard motor dry filter...   This one was when I put the inner trumpet back! Into the air box restricting air flow.....look leaner so don't understand this  |
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Post by seahorse83 on Jul 28, 2013 1:05:31 GMT 1
If you do a bit of a search on plug reading bossy, you might be able to come to terms with your own answer better, As not many will tell you your plugs are fine for fear of giving you incorrect or mis-informed advice, only to have you blame them when your bike goes pop.
I have read the only true way to read a plug is to go through a process of getting new ones in, do the chop at whatever throttle position for the fuel circuit you are tuning, then cut the plugs to the base with a hacksaw. Then read the porceline.
Mate if your bike is blowing smoke/using 2t oil , its not getting too hot, the plugs arn't pitted, and they have a bit of brown coffee colour to them and your not racing, well all is good IMO. You could always up the oil setting a bit, are you happy with your pilot fuel circuit air setting.
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Post by bare on Jul 28, 2013 1:28:11 GMT 1
Top plug looks 'fine' imo. Although I prefer them a bit darker brown and a wee bit oily :-)
Plug Chops and all that associated foolishness is 'for the race track'.
Getting the last possible erg of energy out by jetting to the bleeding edge of lean..is a Risky business... with constant rebuilds as the price of admission.
At least it was for me when I fielded Tz's in early 70's.
Street running, 40! years later, is All about getting out AND getting home with a running engine.
Pull yer plugs after an hour or more of running is Plenty accurate.
Unless you are jetted foolishly lean, in which case it won't take long at all to register as a problem.
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Post by Bozzy on Jul 28, 2013 22:00:46 GMT 1
Seahorse appreciate what you are saying about someone saying ok then it blows up at the end of the day but do understand it's my risk just hoping to tap into the knowledgable people on here with lots of 2t experience..like you have all done so upto now and actually helped me solve the running issues...so thanks guys..
i am now really a bit stuck with jetting in any case . if I go up 1 on main it runs crap 4 to 6 k if i lift the needle one slot ie back to standard same effect put trumpet back in air box same. FYI removing the trumpets has sorted that mid range issue or moved it lower down the band.
Now it only misses pops bangs about 3 to 4k so can live with that at is 40 mph range now unlike before its nice and smooth from 5 k up to 6.5k where it comes on pipe and goes. On pipe now is not as hit you in the arse as before as its now got the mid range back. Only concerns is its running a little hotter needle width just above half way and coming off pipe it will loose momentum quickly. On pipe it revs alot quicker then it's ever done. Just got standing start issue where it bogs down a bit...
by the way seahorse followed your advice on setting pilots up and it worked I could actually notice the revs change on the air screw, only issue they are 2 turns out and bike appears to want only 1 turn cheers. Just pick the revs up on steps a bit like you said and it works!!
It's takes some messing about to get to this but it's never ran better.....I am obviously concerned its running weak but have gone up 4 on mains.
Bare ---- thanks for reply. The last picture which i thing the plug looks a bit lean was when i had a larger jet in!! the oil pump is about 1 turn more been trying to oil up more. They were alot oily when up on main by one.....going to but a cap of castrol in fuel so this might help a bit also...
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Post by seahorse83 on Jul 29, 2013 1:26:46 GMT 1
its interesting having re-read the airbox thread you went to 25 pilots, I have 1 and 1/4 turns out on the air, yet are getting 2 turns on the airscrew, with the same carbs,pipes and airbox.
Why dont you try a 1/2 turn in on the air, and see how she comes off the line. Its not going to lean her out, you may have to just tweek the throttle stops in a fraction to get the revs up but worth a try, and safe.
The popping and banging should not happen, remembering its a 2t as well, and old, hence the term riding the throttle comes into play a bit.
If it is popping and banging, Id be 100% confirming that the needle jets are clean,and jet needles are 31k spec. You may find you have a banchee needle or even worse a tommy needle in the mix.
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Post by flames on Jul 29, 2013 19:43:05 GMT 1
I thought poppin and banging was a sign of running lean? on overrun anyways. perhaps something to do with being 2 turns out on airscrew?
I agree with seahorse,i would go in a bit.you could try 1/4 turn,and 1/2 turn.see which works best.
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