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Post by daddyeby on Dec 29, 2006 19:22:38 GMT -5
Well after the jet change the scoot hickups at the top end. Not to sure what is causing it weither it is to rich or lean it did it before the jet change but not as bad. And this is a larger jet. Dawg informed me the the speedo is pretty close and today I did the count deal kept comeing up with 10 sec to fourty I think it ran a little better with the 85 jet.
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Post by riker140 on Dec 29, 2006 19:44:29 GMT -5
well you beat me that's what I have been trying to do. congrat's my friend
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Post by daddyeby on Dec 29, 2006 21:36:08 GMT -5
Its a little screamer but I still have a lot to do It hick ups at the top end have to wait for the jets to come in. I am not sure it is the high speed jet but we will see when the jets come in.
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Post by sussexscooterhead on Dec 29, 2006 22:25:57 GMT -5
Is it possible you have a float level issue (too low) or fuel delivery problem?
Then no matter how big a main you put in it'll never run properly.
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Post by daddyeby on Dec 29, 2006 22:34:53 GMT -5
It maybe but untill I have some time to check it out I wont know.
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Post by stradelle25 on Dec 30, 2006 12:35:23 GMT -5
Alright, sorry to go off subject. Im still in PR and need to get back to San Antone to get going on my scooter. Well, meanwhile Im looking at some jets to buy. The site provided on this thread for Beatrice has jets. They are compatible with, I believe, Panterra models and stuff like that. So if I were to choose jets for my (CVK) carb I would have a better chance with XR70? Not sure if mine are round or hex, need the scoot in front of me. I read the entire 50/80cc thread (felt like I was doing an assignment for school as I had to take notes )and helped alot. Except for this minor problem.
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Post by riker140 on Dec 30, 2006 14:09:41 GMT -5
srta---25:
You more than likely will need a 38 low speed and a 88 high.
They are Keihin JETS for CVK carbs google "Keihin jets" you'll fined a web site that will give you the numbers you need. If you can't ID them email me on this web site just click on my name on the left.
Dave
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Post by stradelle25 on Dec 30, 2006 14:33:18 GMT -5
Oh, forgot to mention on my email. I found some id numbers, but I dont know how long the jets are. They have some main jets that are between 6 to 16mm long, slow jets 15 to 32mm. I guess I need to break down my carb when I get back.
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Post by daddyeby on Dec 30, 2006 17:14:55 GMT -5
Most 50cc scoots use the same jets as far as I know. It is raining and going to turn cold so I wont be able to do and work on the scoot. I am going to tear into Dawg old engine to see what can be done with it.
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Post by daddyeby on Dec 30, 2006 18:31:38 GMT -5
Well the jets came in today. When the weather permits. I can fig out what causeing it to hickup at the high end. I have started tearing in to the old motor looks like both bearings are bad dont know if the engine is usable yet. Have to spilt the case and see if the crank case and shaft are useable if either is shot I think its time for a new motor. I am going to have to rig up something to hold the shaft to pull the mag. I didnt feel like messing with it tonight.
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Post by Admin on Dec 31, 2006 17:47:56 GMT -5
Something had to cause those bearings to go bad. I just don't have a clue what would do it. Interesting that it happened when my roofer friend was in possession of it.
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Post by daddyeby on Dec 31, 2006 20:47:31 GMT -5
The Oil pump seems to be ok. The only thing I can think of is maybe he was reving the engine on the stand it vibrated off the stand so it was kind of like dropping the clutch. I pulled the engine completely apart tonight I dont know about replacing the bearings they are below gears on both sides. I think they will be a major pain to remove and even a bigger pain to get on right. But now I have seen all there is to see about the little motor.
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Post by daddyeby on Jan 1, 2007 20:10:35 GMT -5
Well I got in a hurry and broke a tooth of the timing gear on the crank so now I don’t know what I can do. How ever I did come up with a couple of good tips you can buy two heavy metal straps made to hold wood planks ect together and three short bolts used one bolt to tie the straps together at one end making a hinge point. Then put the other two bolt one in each strap makes a spanner wrench to hold the magneto. The next little trick is take one off the same heavy strap and used one of the holes already in the strap and line it up with the one bolt hole used to hold the fan on holding the strap across the end of the crank drill a hole where the bolt hole is cross from the first hole. Then put a bolt in each and make it snug tap the strap right above the crank snug the bolt again and continue till the magneto is lose.
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Post by daddyeby on Jan 2, 2007 9:41:23 GMT -5
Valley scooters has a complete crank for 40$ so the engine is worth repairing I dont have to go in today till 3 so I will have time to change out jets and do some riding.
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Post by daddyeby on Jan 3, 2007 0:51:10 GMT -5
I am down to a 94 jet its getting close running pretty good tomorrow I will go to a 90. The scoot is doing better than what I was aiming for The lowest I go on any hill going to work was fourty five mph. Just guessing buy the change in the tach I think I hit 70mph tonight 4000 rpm at 40mph and I made it to 7000rpm I know the tack is off but if they are relative then I should have hit 70mph. Dawg the scoot will be a nice yellow here soon. Thank goodness he used regular spray paint acetone removes it but dont hurt the ome paint. It dont look like he hurt that paint so far.
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Post by ooopseyesharted on Jan 3, 2007 6:41:31 GMT -5
wow....nice work man
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Post by Admin on Jan 3, 2007 13:16:11 GMT -5
Nice. If you want to know what kind of speeds you are going you can get a bicycle speedo pretty cheap. The speedo on the scoot pegs at around 48. The bicycle speedos are pretty accurate if you calibrate it right.
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Post by daddyeby on Jan 4, 2007 12:13:08 GMT -5
Well down to a 89 jet last night only time the bike had any isssue was a slight miss a max speed going down hill. Seeing how it was almost midnight I didnt do a plug read. I have removed almost all the spray paint with acetone and MEK the scoot looks alot better. When finished with the fine tuning with the carb it will be time to start on the CVT. The only other mod I can think of with the engine that I know that can be done is a ram air from the vents on each side of the body. I dont know if it will make any differance but the air should be a little cooler. Or maybe going ahead and getting the A9 cam.
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Post by perrym on Jan 4, 2007 14:10:32 GMT -5
Try a high speed pass on level ground. When you do a high speed pass on a down hill, you end up over-revving and causing the CDI to miss due to the fact that the motor is no longer pulling the bike, gravity is. I bet you have nailed it with an 89 jet. Remeber, slide carbs are much more effecient and do not need as big a jet as a CVK carb. If you were running the stock CVK, you would probably need a 105 jet.
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Post by charlieh on Jan 4, 2007 15:26:24 GMT -5
Hey Daddy,
Try closing the gap on the plug a c-hair. That might help with your high speed miss.
Are you running aftermarket CDI and coil?
Cheers, Charlie
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Post by daddyeby on Jan 4, 2007 18:51:51 GMT -5
I am running a stock coil and CDI I have not heard from anyone of improvements by using them. I will check the gap again thanks.
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Post by riker140 on Jan 4, 2007 19:09:17 GMT -5
don the so called racing CDI don't work not worht the money but the hot coil is a goood investment
Dave Riker
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Post by Admin on Jan 4, 2007 22:14:43 GMT -5
On the small miss you experience while running full tilt, I have experienced the same and never found a fix. It only last for a split second. I think it's just the nature of running the qmb at it's limits. It just needs to hiccup. The one thing I never tried was increasing the size of the fuel lines.
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Post by daddyeby on Jan 4, 2007 23:01:00 GMT -5
I tried increasing the fuel line on the wildfire and it didn't help. At the time I thought it was the cv carb but seeing how I am using a slide now that isnt it. Ideals anyone?
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Post by charlieh on Jan 5, 2007 8:54:13 GMT -5
Still got the hiccup up top. Could be spark. Get a coil for $15 at the auto parts store. Could be fuel. Bypass the petcock and run straight off the tank. Could be those crazy rpms you run at 70mph. Try some 12" wheels I gave you some karma. That might help ;D Cheers, Charlie
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Post by Dennis D on Jan 5, 2007 9:14:56 GMT -5
It may be something else, but a fuel mixture that's too rich can cause a hiccup like that. You might try going one size smaller on your main jet and see if that eliminates it, if a plug read shows that you're still on the rich side.
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Post by pdaddy on Jan 5, 2007 13:28:27 GMT -5
What a MONSTER !!!! Good luck m8, if u got to many probs eith the slider buy a cheap OKO Keihtn copy (regular). M
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Post by daddyeby on Jan 6, 2007 3:16:19 GMT -5
I havent had time to do any adjustments but on flast or up hill the scoot is running great down hill I have a miss I hope to have some time to check it out this week end. Went on a good ride this afternoon Hope to ride to work it in the morning.
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Post by perrym on Jan 6, 2007 12:39:37 GMT -5
I havent had time to do any adjustments but on flast or up hill the scoot is running great down hill I have a miss I hope to have some time to check it out this week end. Went on a good ride this afternoon Hope to ride to work it in the morning. If it's fine on level ground, then it sounds like you have the jetting almost if not perfect. Do a high speed plug read at WOT on level ground, probably will be perfect. The problem on a downhill is the CDI can't keep up with the RPM's of bike as the motor is no longer pushing the bike, gravity is causing the miss. The best thing to do, is find what your top speed is on level ground and do not exceed that going downhill otherwise you can burn out the CDI.
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Post by sussexscooterhead on Jan 6, 2007 14:27:36 GMT -5
I don't yet agree with what Perry said - that the CDI can't keep up with the RPM and that it could damage the CDI - and so I went looking for some information regarding high rev misses, causes and potential component damage. Perry if you could link to some information outlining how the CDI would be damaged I'd appreciate it. Anyway, I came across this: When using an MSD ignition box, make sure you ground the box to the engine block itself. Placing the ground wire, (usually a heavy gauge black wire), somewhere else, like on the body panels, can lead to a high rpm miss in the engine. A miss can sometimes be hard to track down, but on a number of occasions the miss was due to a poor grounding of the ignition box. Placing the ground wire on the engine gives the shortest, most direct path for the circuit and the high rpm miss will disappear. And speaking of good grounds, take a short piece of battery cable and make a ground strap that runs from the engine block to the frame rail of your vehicle. If you have moved your battery to the rear of the vehicle, connect your battery's ground cable directly to the frame. From this site: www.mortec.com/notepg1.htmSeems like kind of a long shot to me but maybe it's worth beefing up the ground cable and ensuring that all ignition related connectors are in the best possible shape. I'm going to continue looking into this and if I find anything interesting I'll be sure to pass it along.
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