|
Post by sweden on Aug 26, 2010 12:00:57 GMT -5
Installed a new air filter and air intake pipe and played with the AF adjustment...still the same. Adjusted the valves and played with the AF adjustment, still the same. Adjusted the valves a second time. Still the same Removed the carb, stripped it, cleaned it as per the Big Guys Carb cleaning video (great video, I learnt alot there) replaced it, got it started, took it out and warmed it up and tried the AF adjustments and the bogging was still there. Checked petcock which was working fine. Installed a new gas filter, even though the old one looked fine. Installed a complete new carb, took it out, warmed it up, tried every position with the AF and still can't get shot of the bogging.
Any ideas where I should start looking now, the carb cost me about 60 quid and I was hoping that was going to be the saviour, alas I was wrong.
I am going to adjust the valves again tomorrow just to be sure, my T doesn't line up perfectly with the mark on the case but I am figuring this is probably normal on a chinese scoot....is it? It is about 1cm off.
Could I have a bad HT lead or plug that would cause this?
Any ideas will be most gratefully received and followed through.
Thank you so much again folks
|
|
|
Post by onewheeldrive on Aug 26, 2010 22:11:47 GMT -5
Crappy ignition coils and/or spark plug caps can cause bog-like symptoms.
|
|
|
Post by erictheviking666 on Aug 27, 2010 0:18:04 GMT -5
My "T" mark lines up perfectly, and I've never heard of one whose timing marks didn't match up. Maybe your timing is off, that's what it sounds like and would probably cause it too bog as well.
|
|
|
Post by sweden on Aug 27, 2010 0:27:37 GMT -5
How do you adjust the timing on one of these things? Do I need special tools like a light strobe or something?
I will change the plug again tonight, check HT lead and coil, as well as do the valves.
|
|
|
Post by relaxinrob on Aug 27, 2010 7:08:34 GMT -5
I am having the exact same symptoms. I have everything he has in addition to replacing the cdi and coil. Still the same logging. My timing marks line up and I have 150 pounds of compression. Help us please!!!
|
|
|
Post by sweden on Aug 27, 2010 9:48:58 GMT -5
I was thinking of replacing the cdi and coil but if it hasn't helped you, I am not sure I am going to spend anymore money just yet....this is so frustrating, I have been over everything I can think of and still no go. New plug and valve adjustment (for the third time) happening this weekend and I will see where I am at, I don't want to be beaten or give my cash to a mechanic but it feels this is going to be the course of action.
|
|
|
Post by sweden on Aug 27, 2010 9:50:23 GMT -5
I am having the exact same symptoms. I have everything he has in addition to replacing the cdi and coil. Still the same logging. My timing marks line up and I have 150 pounds of compression. Help us please!!! Yeah throw us a bone dawgs!!!
|
|
|
Post by rgdroid on Aug 27, 2010 9:58:29 GMT -5
The only other thing I could think of is the needle with the diaphragm in the carburetor. If its sitting too high then your scooter will bog down. Even with a new carb this "could" be the case.
Just remove one of the washers from the needle, which will make it sit lower in the carb.
Hope this helps.
|
|
|
Post by sweden on Aug 27, 2010 10:29:07 GMT -5
I will give it a go. Thanks
|
|
|
Post by tortoise on Aug 27, 2010 16:56:56 GMT -5
|
|
|
Post by sweden on Aug 28, 2010 2:36:33 GMT -5
Ok, no worries, only those posts followed specific topics, such as valves, carb, carb cleaning and as the topic came to a close so too did the suggestions to follow, so it kind of made sense to re-list what I had gone through and where I had go to rather than making it a 4 page epic post that doesn't get read!
|
|
|
Post by als01seville on Aug 28, 2010 3:25:24 GMT -5
Sweden, you said "Installed a new air filter and air intake pipe " Now if you extended out the filter with the Air Intake Pipe that changes the air flow coming in. Try just putting the Air Filter right on the Carb. Extending the Air Filter to far from the carb with a pipe may be your problem.
Ok, lets try this we first have to determine WHY its bogging, TO Much fuel or NOT enough.
So when it Bogs on you Back off the Throttle a little and see if it helps.
If it helps then here is what will tell you if its Rich or Lean: 1. After you back off the Throttle a little: a. If it Speeds up your running Lean. b. If it Stumbles THEN Speeds up your running Rich.
Let me know of the results. Alleyoop Alleyoop
|
|
|
Post by sweden on Aug 28, 2010 6:11:36 GMT -5
Hi als01seville,
I haven't actually extended the air intake, I just installed the pipe that was missing from the scoot.
I have installed a new spark plug today and set the valves again, although I am not that happy with the valve setting, I think I will do it again tomorrow as there is too much "chattering" and the scoot seems to run worse.
Generally, the scoot will run ok until I open up the throttle and then it bogs out, if I back off then it runs fine again, I have continually adjusted adjusted the A/F several times in 1/4 turns (tried this both ways just to see) and the bogging just doesn't go away. I am starting the process with the AF screw turned out 2 full turns.
Thank you for your reply.
|
|
|
Post by relaxinrob on Aug 28, 2010 7:02:35 GMT -5
I am having the same problem.....discovered last night that I can get through the bogging on the center stand by squeezing the air filter tube that connects to the carb,but then I have to release it to get it to consistently rev.....any ideas? Sweden, try that and see if it works for you too. It's not a solution but may help identify what is going on!!
|
|
|
Post by sweden on Aug 28, 2010 8:15:31 GMT -5
I will give it a go and let you know.
|
|
|
Post by tortoise on Aug 28, 2010 10:12:44 GMT -5
made sense to re-list what I had gone through and where I had go to rather than making it a 4 page epic post Incorrect . . segmented discussions just complicate the issues!
|
|
|
Post by lshigham on Aug 28, 2010 11:17:46 GMT -5
Crappy ignition coils and/or spark plug caps can cause bog-like symptoms. +1 I've seen a dodgy coil cause the same problem. It even tested fine.
|
|
|
Post by als01seville on Aug 28, 2010 16:13:31 GMT -5
Well there is your answer you are running LEAN. If you cut off Air more fuel is getting in, so try either Raiseing the Needle in the Diaphgram one notch or put in the next size Main Jet. Alleyoop
|
|
|
Post by sweden on Aug 29, 2010 4:05:00 GMT -5
Well there is your answer you are running LEAN. If you cut off Air more fuel is getting in, so try either Raiseing the Needle in the Diaphgram one notch or put in the next size Main Jet. Alleyoop I raised the needle one notch and adjusted my valves (again) this morning, snapped a bolt in the valve casing head so just have 3 bolts holding that on now, but that is another issue ) The scooter ran better, it didn't die out on full throttle, but there was an intermittent bogging throughout the revs and the AF adjustment didn't seem to rectify that, my valves seem to be chattering away now, maybe I don't have them set right, I originally adjusted them using a soda can and then bought a proper feeler gauge which is really clumsy to get it sitting comfortably in that small working space. It feels like the 0.05 feeler is about twice the thickness of the soda can, could this be right, it was a coke can if that helps!! I suppose I need to get the valves sorted before moving on now.
|
|
|
Post by keetarider on Aug 29, 2010 5:38:07 GMT -5
.003 to .005
|
|
|
Post by als01seville on Aug 29, 2010 13:33:54 GMT -5
Re-adjust your valves with the feeler guage, They shoule not be Clattering that means they are to loose. Take your time adjusting them, after you adjust them tighten the nut up just Snuge and turn the motor over several times and bring it up to TDC again and re-check them. If they are still good then tighten the nuts up. This way you won't be having to be taken it apart because they are not right.
Well you are almost there now, but if your bogging throughout the the mid-range that points to the NEEDLE on the Diaphgram. Which ever way you went go the other way ONE NOTCH. Alleyoop
|
|
|
Post by sweden on Aug 30, 2010 0:30:30 GMT -5
Hi again,
Ok, I will take the needle up 2 notches from where I am now and reset the valves. I will let you know what happens.
Thanks again.
|
|
|
Post by sweden on Aug 31, 2010 12:45:34 GMT -5
Ok, so I adjusted the valves and am really happy with them now, no clattering and it sounds just right, I set them both at 0.05. I ran it with the needle dropped as you suggested als01seville and it didn't run nicely, so I took it up two notches as you again suggested and it still didn't run so good so I put it back to the original position and it ran better (I guess that could have been down to the valves?)I couldn't get it to stop bogging with the AF screw so (and I know this is not good practice) I held a screw driver in the screw, kept one leg on the front of the scoot to keep the back wheel off the ground and held it open at full throttle and adjusted the screw until I could get the best revs, got it quite good but couldn't take it out for a proper test as I had a beer when doing the valves....I think it helped ....anyway I shall run it to work tomorrow and see how it is when it is warmed up and with a little fine tuning, hopefully I am jut a couple of AF adjustments away now, but I will let you know tomorrow. By the way, the previous owner cut off the bit from the exhaust that leads a rubber tube into the top of the air box, should I cap this or leave it open? Thanks for all the advice to date guys, it really is appreciated. Once I get this scoot running just so, I am not going to install any big bores or anything...just routine maintenance after this!!!
|
|
|
Post by sweden on Sept 1, 2010 0:30:40 GMT -5
It is still bogging!!! I rode it to work and it was bogging out all over the place, I adjusted the AF and it went a bit better but still bogged. Should I try moving the needle around in the carb again? ? This is driving me mad!
|
|
|
Post by brigadooner on Sept 1, 2010 8:01:00 GMT -5
This is probably way too elementary of an answer but I'll throw it out there just in case. Have you checked the valve in your gas tank cap? My scoot was bogging down at full throttle as well and it was buggin the hell of out of me. I blew out the cap and screwed it on less tight and it was fine.
|
|
|
Post by sweden on Sept 1, 2010 9:40:04 GMT -5
This is probably way too elementary of an answer but I'll throw it out there just in case. Have you checked the valve in your gas tank cap? My scoot was bogging down at full throttle as well and it was buggin the hell of out of me. I blew out the cap and screwed it on less tight and it was fine. Which cap do you mean, the cap where the petrol goes in or do you mean the petcock? I have checked the petcock and that was fine, I wasn't aware of another valve anywhere else, but then I seem to be losing all awareness right now anyway. Can you confirm where you mean brigadooner? Cheers for the answer. Oh and as for it being too elementary.....I don't think anything is right now!!!
|
|
|
Post by brigadooner on Sept 1, 2010 14:02:45 GMT -5
Hey Sweden,
I literally mean the cap on the top of your gas tank where the petrol goes in. There should be a small valve in it to let air in. Its very similar to a jerry can, essentially it keeps the gas flowing smooth instead of creating a vacuum that holds the fuel in the tank.
|
|
|
Post by sweden on Sept 2, 2010 0:45:29 GMT -5
Hi Brigadooner, Ok, I will take a look at that and see how it is. Cheers I have the bike running quite well now when it is warm, (just a bit of bogging at full throttle) but when it is cold, it hardly runs without bogging but as soon as it warms up it is not too bad as long as I don't open it right up?
|
|
|
Post by onewheeldrive on Sept 2, 2010 3:27:13 GMT -5
Hi Brigadooner, Ok, I will take a look at that and see how it is. Cheers I have the bike running quite well now when it is warm, (just a bit of bogging at full throttle) but when it is cold, it hardly runs without bogging but as soon as it warms up it is not too bad as long as I don't open it right up? How cold is it in Sweden right now? Is it possible to do a proper spark-plug read? Maybe try running it around the block with the exhaust off, or check for some sort of exhaust leakage. I don't know.. Do you have an airbox that has the filter inside? Rather than toying with the A/F mixture on the carb, maybe try taking the cover off the box, and riding it----also, maybe try halfway plugging the nozzle on the air box to see if there are any changes.
|
|
|
Post by sweden on Sept 2, 2010 4:36:34 GMT -5
Hi,
It isn't that cold here right now, it has been cold in the mornings, but it was 10o this morning and it is getting to about 17o in the day. I have tried running without the air box (I do have a filter in) and that doesn't help. I have a brand new NGK plug on the scoot and have only looked at the spark against the frame and it looks plenty strong enough. I have held my hand over the exhaust to check for leaks and there doesn't appear to be any. I will try plugging half the nozzle on the air box and see what happens. Cheers
|
|