maccrew
Scoot Enthusiast
Custom painted f-act
Posts: 193
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Post by maccrew on Jul 20, 2011 20:40:37 GMT -5
forgot to mention that the paint i used was 1500 degree grill paint
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maccrew
Scoot Enthusiast
Custom painted f-act
Posts: 193
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Post by maccrew on Jul 20, 2011 21:22:00 GMT -5
could VACUUM OPERATED FUEL VALVE PETCOCK (TANK MOUNT) be causing some of this surging/hesitant running? and 2stroke piston/ring kit is only 30 bucks at scrappy dogs, it is Moly coated piston, rings, wrist pin, circlips. These come in either 10 or 12mm wrist pin size. Genuine QJ brand. $29.95 then i would jsut need to get a headgasket right?
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theo547
Scoot Enthusiast
Posts: 497
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Post by theo547 on Jul 20, 2011 23:19:11 GMT -5
You need to stop trying to guess what your problem is. Use the info people give you here as a starting point.
In all honesty dude... it was 115 on the heat index today in GB couldnt have been much cooler by you - High humidity and crazy amounts of heat = no matter how you tune your scooter today its not going to run good tomorrow.
One scooter mechanic i know says you should only tune your bike 3 times a year (spring summer fall)... ive heard other people say as often as 2 weeks.
Seriously in this kind of weather - dont bother trying its just going to be all jacked up when the temps drop.
In all likely hood your compression is fine, your oil leak is making a mess but it isnt messing with your performance and your scooter is completely out of tune.
PS - SCREW THIS WEEK! I CANNOT WAIT FOR THE TEMPS TO DROP (the opposite of what i said 6 months ago when it was -30... i hate this state...)
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Post by drawkward on Jul 21, 2011 0:49:59 GMT -5
Sure, you can use 1/4" fuel filters, but the hose are going to be really tight and maybe a slight bit more difficult to get on. I use a 1/4" fuel filter.
As for the exhaust, and your tune in general. It's running too rich, causing excess fuel to be burnt in the exhaust making it extremely hot. Does it back fire when you run it to a stop and kill it? Like a little pmphh after it's stopped running? This is what mine is doing, and it's currently running extremely rich (black oily plug). Mine is running extremely rich, and is surging and what not. I have to play with the throttle while riding to get it to clear out (burn the excess fuel) and increase revs.
Today was VERY hot and VERY humid. I was running more rich than ever today, with the most surging. I just rode home at 1:30 AM ET and it's got to be about 15 degrees cooler, with less humidity. Noticed a clear difference in tune. Was easier to clear out and rev. The exhaust, VERY hot today, not as hot tonight. It was so hot this afternoon, I could smell the rubber bushings cooking.
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maccrew
Scoot Enthusiast
Custom painted f-act
Posts: 193
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Post by maccrew on Jul 21, 2011 4:31:09 GMT -5
ok tomorrow im gonna 1. get the fuel filter 2. give my carb a good cleaning. do i need anything to clean the carb or can i reuse gaskets and stuff?
my plug is usually black and oily, no it does not back fire when it stalls out, if its running really rich and causing the surging, what should i do to fix it? i have been trying as much as i can to fix that, remember im still in the learning process, so on that note,
3. im gonna try to get my hands on a compression tester just to see if that shop who screwed me in the first place is anywhere near right, also to check my head gasket i seen someone say to use soapy water on the head well its running and look for it to bubble kinda like on a tire with an air leak correct? if there is a leak can i just put some rtv sealant around it on the outside to seal it up until i have the money to do a big bore kit (this will be a while until i have the cash). so in preperation i think im gonna just start doing premix, i seen in your post before drawkward but im kinda confused, i want to take the oil tank out, cut the hose coming from the oil pump to the carb and plug the hole with a screw and then decide what premix to start doing (32:1 or 40:1)?
last question, after going premix and preparing for a bbk, what should i work on getting for upgrades? example, exhaust or bigger carb,spark plug and wire, ect,ect
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maccrew
Scoot Enthusiast
Custom painted f-act
Posts: 193
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Post by maccrew on Jul 21, 2011 5:10:45 GMT -5
forgot to add, he said the 1/4 they have is a free flow, does that matter?
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Post by 90GTVert on Jul 21, 2011 6:39:53 GMT -5
You should be able to reuse the gaskets in the carb so the only supply you should need is carb cleaner.
Black and oily likely means it's rich and oil fouled (too much oil). That goes back to what I've been saying for a long time, fix the known problem before you worry too much about anything else. If you are injecting or leaking too much oil in there, it's gonna hurt performance. Get that pump taken care of, change the spark plug out since it sounds nasty or at least clean it, and then see if it's any better.
I'd probably do 40:1 premix for your setup.
If you see a leak around the head, just applying RTV to the outside isn't going to work. You would need to pull the head off and replace the gasket and/or use some copper spray gasket.
Free flow is fine.
To prepare for a BBK just get a selection of main jets around, a new spark plug, and a tuning set of rollers wouldn't be a bad idea. You don't need a bigger carb or a new exhaust unless you end up with some high end racing kit, which I wouldn't recommend.
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Post by drawkward on Jul 21, 2011 9:39:10 GMT -5
Agreed, RTV on the outside would be worthless. Would like just cause a bunch of nasty smoke.
Don't worry about spark plug wires. Unless yours is damaged (cracked, exposed), you really don't need it.
If you're running rich, you can put some holes in the filter box. I do 1/4" holes near the top, on the side where the snorkel goes. Maybe 4 holes. Tape them all up individually, and go for a ride. Stop, pull the tape off of one, go for a ride. Stop pull the tape off the next one, go for a ride. Repeat until it goes the fastest for you. Then check the plug, to make sure it isn't too lean.
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maccrew
Scoot Enthusiast
Custom painted f-act
Posts: 193
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Post by maccrew on Jul 21, 2011 15:31:07 GMT -5
ok, couple things, if i go premix, the autozone in town sells bottles of 2stroke oil that is ready to go, 32:1 or 40:1 ratio's, my gas tank is a 1.4gal can i use those and just go a little under on the oil and not hurt anything? i got my new fuel filter im putting that in and im gonna run seafoam also because it seems like an easy try, the ladie at autozone has a rocket she works on and she asked what was wrong with my moped and i told her, so she came outside and took my gascap off and it ran fine, i put the cap on for the way home and it bogged out half way home, i took the cap back off and it ran like a champ just low on top end speed from the oil issue i think. any thoughts?
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maccrew
Scoot Enthusiast
Custom painted f-act
Posts: 193
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Post by maccrew on Jul 21, 2011 16:24:32 GMT -5
new update, i went out and did a couple ounces of seafoam, put in my new fuel filter, and my gascap was all gummed up so i took it apart and cleaned it, drilled 2 1/4 holes in the air box like you said, now the bogging takes longer to happen but when it does its worse, ill be driving at like 35mph and it will start to bog out no matter what position the throttle is in and once it slows enough it bogs out completely, does not back fire when it stalls, just shuts off as if it lost power. the gascap off doesnt seem to be doing much but possibly the fuel filter is on backwards?
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maccrew
Scoot Enthusiast
Custom painted f-act
Posts: 193
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Post by maccrew on Jul 21, 2011 16:27:53 GMT -5
forgot to add that it feels/sounds like its either flooding and just shutting off or running out of fuel and shutting off.
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maccrew
Scoot Enthusiast
Custom painted f-act
Posts: 193
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Post by maccrew on Jul 21, 2011 16:47:36 GMT -5
ok sorry if im posting alot but i really need this thing fixed so im doing everything i can, any suggestion i get from anyone on here or in person, here is a picture of my fuel filter that i just put on, it is brand new kinda big compaired to what used to be on there, but it does fill with fuel and seems to kinda empty out if on middle stand and im just revving the motor.
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Post by 90GTVert on Jul 21, 2011 17:35:18 GMT -5
After what happened at the auto parts store, see if it stays full and doesn't shut off if you leave the cap off again. Also, it's not good to make fuel run uphill in a gravity fed system. You should shorten the hose to the carb enough that it doesn't create that dip.
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Post by jmkjr72 on Jul 21, 2011 20:23:37 GMT -5
what way is the flow arrow on that fuel filter im asking as the part number is upside down and the last one i had the part number was right side up to follow the flow arrow
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theo547
Scoot Enthusiast
Posts: 497
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Post by theo547 on Jul 21, 2011 21:06:24 GMT -5
dont worry about posting too much... everyone wants to help.
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