Author Topic: plug opinions SOLVED (Read 5581 times)

scottly · « **Reply #25 on:** July 10, 2012, 09:35:43 PM »

Quote from: skamagedon on July 10, 2012, 09:13:28 PM

must be a wee bit lean. i commuted today and throttled it good... it starts after its warm, i can get to speed and cruise, but at mid throttle it stutters, or misses.

Try raising the needle (lowering the clip) a notch and see if the mid-throttle improves.

lucky · « **Reply #26 on:** July 11, 2012, 02:00:13 PM »

Quote from: scottly on July 09, 2012, 10:51:25 PM

Skam, your stuttering issue, plus the bone-white insulators point to a lean condition, IMHO. (waiting for someone to say "beam me up, scottly! )

I agree LEAN.

lucky · « **Reply #27 on:** July 11, 2012, 02:02:41 PM »

Quote from: skamagedon on July 10, 2012, 09:13:28 PM

must be a wee bit lean. i commuted today and throttled it good... it starts after its warm, i can get to speed and cruise, but at mid throttle it stutters, or misses. it used to have 750 mac4-2 w no baffles, now its baffled reverse megaphones and chokes, or starves?

It is on the verge of seizing!

You gave us no jetting information at all.

skamagedon · « **Reply #28 on:** July 11, 2012, 06:43:20 PM »

Im pretty sure its stock jetting

skamagedon · « **Reply #29 on:** July 11, 2012, 06:45:48 PM »

I have a 14 mile ride home....can i fatten it up a bit before i get home and pull the c bags? Really dont want to kill it on the way home

scottly · « **Reply #30 on:** July 11, 2012, 06:51:11 PM »

Quote from: skamagedon on July 11, 2012, 06:45:48 PM

I have a 14 mile ride home....can i fatten it up a bit before i get home and pull the c bags? Really dont want to kill it on the way home

Don't try to do the "ton" for those 14 miles. What's a c-bag???

skamagedon · « **Reply #31 on:** July 11, 2012, 06:54:04 PM »

Carbs...like a d bag....cause they are tedious. Ill post a vid later w sound too

skamagedon · « **Reply #32 on:** July 11, 2012, 09:59:11 PM »

so i adjusted my timing and points, headed for home, got on the freeway no brob, cruised at 60@5k ish.after 15 min, after the offramp, throttle back up and way less of the issue, but still some issue. i had some hesitation at 1/3 ish throttle and at 3k cruise, 3/4 to wot it and it straightens out. have i reached the 550 flat spot? it just feels waaaay different after the rebuild

skamagedon · « **Reply #33 on:** July 13, 2012, 12:12:19 AM »

photo bump....chopped in problem area 3rd gear 4k....right to left, obvios #4 is issued.... theres some clack in the valves on that one ima sort

IMAG0811 by Skamagedon1, on Flickr

dave500 · « **Reply #34 on:** July 13, 2012, 02:39:38 AM »

your not running lean,the side electrodes havent melted.

TwoTired · « **Reply #35 on:** July 13, 2012, 10:14:23 AM »

Looks like about pic#23 on the NGK chart.

http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html

But, they should all be the same and it looks as though #3 has more deposits than the others.

skamagedon · « **Reply #36 on:** July 13, 2012, 09:11:28 PM »

that guy I use to have a bookmark and pretty much his site help me fix my bike from the gecko

skamagedon · « **Reply #37 on:** July 13, 2012, 10:59:01 PM »

so more back pressure means i should richen or lean?

seanbarney41 · « **Reply #38 on:** July 13, 2012, 11:21:42 PM »

don't try to tune with pre-concieved notions of what has more or less back pressure...it won't work. A short open header can have more back pressure than a proper long baffled exhaust...back pressure is really all about resonance and nobody has really figured it all out for 4 strokes

dave500 · « **Reply #39 on:** July 13, 2012, 11:27:30 PM »

check those plugs in a weeks time,youll be happier.,i run stock air box and paper filter type one carbs 100/38 and a free flowing 4-1 no worries with a 550,mine look new for a week,im not lean,youll run yourself in circles chasing nothing.

skamagedon · « **Reply #40 on:** July 13, 2012, 11:34:14 PM »

dave....it runs poorly though. it gets lurchy when i accel, which im not fond of on corners. if i blip the throttle it hangs on the highr rev for seconds. i dont want to melt my block or be all surgy. the only difference between then and rebuilt is the edited exhaust. it ran quite well for how much oil it left everywhere, but was LOUD. cb750 no baffle mac 4-2 bells.now its capped with kz650 reverse megaphone w/ baffle. ive set my air screws to 1.75 out, testing that soon. then maybe needle clip if it persists?

dave500 · « **Reply #41 on:** July 13, 2012, 11:42:20 PM »

youve checked the advance mechanism isnt sticking?

skamagedon · « **Reply #42 on:** July 13, 2012, 11:43:16 PM »

skamagedon · « **Reply #43 on:** July 13, 2012, 11:44:07 PM »

it runs perfect for 5 minutes ish

dave500 · « **Reply #44 on:** July 13, 2012, 11:44:23 PM »

do your airscrews have the hole in them or are they solid?

the solid type offer more control over a lean out,heres a couple i soldered up.

skamagedon · « **Reply #45 on:** July 13, 2012, 11:49:19 PM »

holes. yes. cleaned as part of carbies.

dave500 · « **Reply #46 on:** July 13, 2012, 11:53:00 PM »

try and find some soild ones or solder yours up,or a spare set so you have both,,the hole type dont let you enrichen the idle/off idle for smog reasons or some #$%*,get hold of some spares and try it,with the hole type even fully closed they pass air,,all the talk about how many turns in or out dosent matter its a per engine thing,,not many have mentioned about the hole or non hole screws so people counting turns may as well be counting sheep.

skamagedon · « **Reply #47 on:** July 13, 2012, 11:57:50 PM »

im a solder soldier...lol, ill try that. i may also remove the outer baffle plates

dave500 · « **Reply #48 on:** July 14, 2012, 12:00:59 AM »

do one modification at a time,if you feel you need to you can un solder those screws,,i always run solids,its a bit like those old idle screw limiter caps on old smog 80s cars carburettors,,you got piss all of a turn to tune with.

skamagedon · « **Reply #49 on:** July 15, 2012, 12:59:44 AM »

Ok....rebuilt oil pump, recleaned and adjusted carbs..100 mains, 38 slows, btw. #2 had white corrosion and the floats had white dust and looked dry as a bone. Cleaned float needles. Might have been the issue. Tests tomorrow

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Author Topic: plug opinions SOLVED (Read 5581 times)