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Post by run50cc on Jul 9, 2012 22:32:44 GMT -5
Heres the story,,
Just recently bought a runmaster 215t and started right up..drove it home immediately after. When driving, noticed it would reach about 30 mph but seemed to be hesitating..stuttering a bit..as if needed a new spark plug so i just figured id get home and replace one. after about 15 min of driving i reached a small hill and the scooter slowed down tremendously...started noticing it really bogging down. After about 5 more minutes it would hardly move past 10-15 mph. I pulled over to realize the spark plug wire was ghetto rigged and electrical taped together...so i made it home shortly and bought a new wire, and spark plug and installed. No change. After doing research ive done the following..
1. new spark plug and wire
2. removed and cleaned carb including sprayed jets clean with carb cleaner 2 different times and reinstalled.
3. done finger compression test to see if finger was blown out...backyard mechanic trick and seemed to have good compression
I just removed the new spark plug to see what it looked like and it was very dark..as if getting to much fuel..although when reinstalling fuel lines back to carb i mixed them up soo it could have just been too much fuel in carb to begin with...it did take a long time to start once i reinstalled.
Bike starts up flawlessly and runs great at idle at around 2k..bike wont engage tire till around 4000 rpm though and wont rev past about 8k. when i drove it home it was registering up on the china tachometer at over 10k rpm redline...i still dont know how accurate i think that is but regardless. The problems now is it stumbles, hesitates, staggers, and doesnt go ubove 10 mph and can barely make it up the driveway. What could have went wrong in 5 miles? And if it idles great now at 2k why not engaging until 4k? why was it revving so high while driving home?
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Post by relaxinrob on Jul 10, 2012 12:45:26 GMT -5
sounds like your airbox has a serious leak in it. Your AF ratio is now way off.
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Post by larry001964 on Jul 10, 2012 12:53:26 GMT -5
Im thinking a carb cleaning paying special attention to the main jet. May also want to check the carb diaphram for a small tear. Thats where id start. Hope this helps
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Post by run50cc on Jul 10, 2012 14:43:08 GMT -5
Will do right now, thanks. Whats something good to use to clean main jet? already cleaned it twice with carb. cleaner.
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Post by run50cc on Jul 10, 2012 14:48:42 GMT -5
and relaxinrob, i disconnected the hose to the carb from the airbox to see any difference and it ran a small amount better..not more than 1 mph..not sure if that means anything..dont know much about these motors but i figured that would lean it out tremendously and it did nothing
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Post by run50cc on Jul 10, 2012 15:41:11 GMT -5
Alright, just put brand new gas in it, little bit better, might still need to run a little more of the old fuel out of it.
I also checked the diaphram, no tears or holes..looks ok.
I just pulled off the variator and looked at the rollers, they have small flat spots in them and the belt is practically worn out. Im thinking the belt is too narrow from wear along with rollers being shot. Also, opening it up its extremely dirty inside, im thinking the clutch is practically shot and could explain why its revving so high and not engaging until 4-4.5k...anyone think this may be practical? I cant find a way to remove the nut for the clutch without air tools so as soon as i find a way to remove it i will let you know what i find. at WOT this thing revs to 10k easy..thats way to high..i dont want to kill the motor and overheat it..belt issue?
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Post by run50cc on Jul 10, 2012 18:58:41 GMT -5
OK, after cleaning jets with toothpick and wires and was able to see directly through..still no fix...decided to do a complete overhaul of components that could have issues:
on friday im ordering:
-new belt
-a complete clutch assembly including housing
-a complete new variator assembly with 8.5g rollers to stop it from revving so high
-new free flow cone airfilter
any other ideas would be appreciated
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Post by larry001964 on Jul 10, 2012 19:08:13 GMT -5
Have you tried taking the snorkel off the front of the airbox ?
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Post by run50cc on Jul 10, 2012 19:23:16 GMT -5
yes..it was off the last time i rode it
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Post by larry001964 on Jul 10, 2012 19:28:49 GMT -5
Ok lets try doing this.  Tape up one half hole at a time, try it, and it will give you an idea of whats happening.. Too much air to fuel is what I'm thinking |
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Post by run50cc on Jul 10, 2012 19:39:57 GMT -5
Larry, so in doing this trick it will limit the amount of air coming in thus if it fixes the problem then im running to lean?
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Post by run50cc on Jul 10, 2012 19:41:16 GMT -5
I basically took the entire bike apart, ill reinstall components and try this...im still very puzzled as to why it would rev so high..
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Post by larry001964 on Jul 10, 2012 19:52:27 GMT -5
Larry, so in doing this trick it will limit the amount of air coming in thus if it fixes the problem then im running to lean? I would not say it fixes the problem, it does give you an idea of whats happening so you can better deal with it. I would take relaxinrob advice and make sure the airbox is sealing, both the cover and the tube fitting over the back of the carb, and where the tube fits into the airbox.. If those look good and sealed, then this trick will tell you if your mixture at WOT is right and what direction you need to go to get it right.. The high reving could be a problem in the CVT, its hard to say with out seeing it. If I had to hazard a guess, I would be looking at the variator weights, Clutch contra spring, belt condition, and springs on the clutch brakes and the brake pads them selves.. I'm guessing you bought the scoot used so it's really hard to tell what the owner before you did without looking.. It could have a 1500 rpm contra spring meaning your clutch wont engage until you hit about 4 grand.. Same can be said for the clutch springs, putting in heaver springs will keep the CVT from engaging until you hit a specific rpm the spring is designed for.. The idea behind all of this is to get the engine more into its power band before engaging.. |
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Post by run50cc on Jul 10, 2012 20:20:46 GMT -5
definitely understand what your saying...belt without a doubt need replacing, and im just going to order brand new oem clutch components and variator components...that way all is ruled out in that category..everything inside looks really really dirty..needs replacing anyways and with flat spots on the rollers its time fore new ones.. in the morning i will try and run it with the air restricted and see what happens. with new gas it seemed to rev higher than before. it now reaches 9k on the tach where are before it only reached about 7500-8k. premium gas has a higher octane which slows the burn..could mean engine is running lean also
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Post by larry001964 on Jul 10, 2012 20:24:17 GMT -5
Redline on these is 8000 rpm I would not recommend pushing it beyond that..
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Post by run50cc on Jul 10, 2012 20:37:16 GMT -5
roger that...just need the clutch to engage before 4500
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Post by run50cc on Jul 11, 2012 17:21:27 GMT -5
Reinstalled everything, taped off the snorkel as advised larry and scooter ran slower/worse and did not reach as high of rpms.
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Post by run50cc on Jul 11, 2012 17:23:22 GMT -5
IT seems like scooter isnt getting ENOUGH air to begin with
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Post by larry001964 on Jul 11, 2012 18:06:57 GMT -5
Reinstalled everything, taped off the snorkel as advised larry and scooter ran slower/worse and did not reach as high of rpms. Ok at least we have an idea now, my next idea would be to remove the airbox cover try it and see how it acts ? |
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Post by run50cc on Jul 11, 2012 18:24:55 GMT -5
ok, will do right now...check back in 5 min
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Post by run50cc on Jul 11, 2012 18:38:13 GMT -5
Larry, that is the issue! seams like the air filter is clogged pretty bad and as soon as i pulled out the filter she accelerates all the way up to about 8.5k perfectly, no hesitation at all. Ive narrowed down the reason for not catching until 4500 however to a clutch assembly and rollers. Installing new belt, clutch assembly, and 8 gram factory rollers and will hopefully fix this concern. thanks for the engine help, now i know its only transmission related and will be easy to replace.
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Post by run50cc on Jul 11, 2012 18:38:52 GMT -5
Ill most likely install free flow air filter aswell to clear this problem
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Post by larry001964 on Jul 11, 2012 19:13:07 GMT -5
Larry, that is the issue! seams like the air filter is clogged pretty bad and as soon as i pulled out the filter she accelerates all the way up to about 8.5k perfectly, no hesitation at all. Ive narrowed down the reason for not catching until 4500 however to a clutch assembly and rollers. Installing new belt, clutch assembly, and 8 gram factory rollers and will hopefully fix this concern. thanks for the engine help, now i know its only transmission related and will be easy to replace. Glad you found it, sorry we went thru so much to find a little thing LOL.. But at least now it's running.. As for the tranny 8 gram rollers seems a little heavy to me, I would think 4 to 6 grams, but every scooter is a little different.. As for the free flow intake, I have one, and will move Fawkes back to an airbox style as soon as i can. Fawkes is really not to happy with it.. And tends to sputter under a load.. I could upjet and make it work. But honestly i like the airbox style better anyway.. Glad to hear your running again, drive it safely and keep it under 8000 RPMS ;D |
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Post by run50cc on Jul 11, 2012 19:21:34 GMT -5
lol ok, well maybe just a new air filter will do the trick. i did just pull the spark plug out after driving for about 10 min WOT at about 7-8k and the plug seams a little lean to me. maybe need to just install new air filter, might be allowing too much air in without airbox half on. Yea, just need it to travel faster than 10 mph and it will be golden. hope rollers and clutch does the trick. thanks for your help
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