rockout12001

i just did a compete rebuild and the bike has no power at all. could the reeds be bad? carb problem? starts great (1st or 2nd kick), everything seems ok, but this thing has no power whatsoever. any help would be greatly appreciated. thanks in advance guys.

i was bored and decided to check out this forum again. same as always, no interest from anyone on old small vintage bikes. well, i got the girl running, but didn't have 1st or 2nd gear. took the motor back apart and split the cases. gears stripped. found a good set on ebay for 25 bucks, so i replaced all of em(mixed and matched to get the best) and replaced all of the case seal (which fixed my idle problem from another post). took it out for a little spin and i am so glad i decided to keep it and fix it up. first off, my son and i have something to talk about besided cleaning his room or not pissing his mom off somehow. we got to spend some great quality time together and i hope he was able to learn something besides the cuss words when i couldn't get the thing to idle. only bad thing is- he broke his collar bone playing football and can't ride it for a few weeks. we now have another project- a vintage ktm 125 to restore. we rebuilt his quad and i just re did my beater quad. now i want to restore the dt100. it does run great, but looks like crap.

does it pick up/rev up when spraying wd-40 or carb spray into the carb? try that, if so, you have something inside cutting fuel flow off. good luck. let us know what you find.

figured it out. crank seal blew out sucking air through there.

wish i could, but no carbs on them. in fact, i just sold both of them after taking all of the parts off that i thought i could use. just didn't have the room in the garage and didn't want them outside where someone could take them.

i have taken the carb apart a few times thinking the same exact thing. it has soaked overnight, torch tip cleaned all ports, sprayed all ports. jets clean as could be. i am at my wits end with this thing.

just new top end. piston, pin, bearing, gaskets. bored to 20 over. took carb apart. cleaned out all jets. checked float, etc. all seemed ok, just junk in the bottom of the bowl. slide is nice and free. i thought it was a vacuum leak. when rebuilding, installed new intake gaskets then. made sure bolts were nice a tight. sprayed carb spray all over the place. only place engine changes is when sprayed directly into carb.

anyone? please? help? replaced carb to intake "gasket" , tried moving needle adjustment, still will not idle at all. if i cover the carb with my fingers it will idle down, but as soon as i remove them, it "races" up and will not idle down. sprayed carb spray all around the intake and no change, but if i spray into the carb, it does idle down. PLEASE, can someone help me out. my kid is dieing to ride it.

i just rebuilt the engine and now need to get the carb tuned in. it is a 78 yz80 with a 73 gt80 engine. it ran good before, but that was with really low compression. now with it rebuilt, it doesn't want to idle without me "choking" it with a finger over the intake. to me it sounds like an air leak. i have new intake gaskets and did find a leak on the gasket inside the carb where it "pinches" around the intake. after sealing it off, it seems a little better. i have tried moving the needle adjustment, but it is still very sluggish when opening the throttle and will not idle down. any suggestions? the carb has been completely gone through, so i know it isn't an internal problem.

i pretty much all but gave up on this forum. i ran to our local harbor freight tool store and bought a new set of 2 jaw pullers. first one out of the box popped it off like nothing at all. i just needed a new one with longer "teeth" that could get in behind and grab ahold of the hub. doesn't seem to be too many interested in old beater dirt bikes and giving information out on them. i bought a manual and will just finish the project with my son. he really enjoys "working" in the garage. our next project is rebuilding his 4 wheeler. needs a piston too-low compression.

any suggestions on pulling the magneto off. i have a 2 jaw puller, but it doesn't want to budge. i am wanting to replace the points, but can't get to them.

update again. tore it down today. i was not happy with how it was running. compression was low so it spent a whole 10 minutes and ripped the piston out. took it to the bike shop down the road and he measured and checked wear on the cylinder. he felt it was ok with just honing it out and replacing piston and rings, bearing, gaskets, etc. i suggested boring it out, but he rechecked it and said if it was his, he would just re ring it. i ordered a new piston just because i didn't like just reringing it. oh yeah, both rings were broke too. cleaned, cleaned cleaned. going to paint everything tomorrow. now my question to the techs out there. i don't have a manual, what is the head torque? now i have a stupid question-what do you run in the gearbox? the kid at the counter suggested 80wt. gear/trans lube. i drained it out and it had red fluid that resemebled transmission fluid. maybe someone put the wrong stuff in before i picked the bike up. hoping to have all of the parts by this weekend, but not holding my breath. put a new clutch in the dt100. took it out for a little test drive and what a differance. might rebuild it too. little low on compression too, but runs really good. not the most powerfull thing, but still starts with 2 kicks. starts easier than my kx125.

now i think i might have a problem. i just now noticed i do not have the air box/cleaner. is there a resource for a "bolt on" air filter? i tried searching, but haven't come up with anything yet.

just updating progress. ordered new rubber for it, so i took the old ones off. front brakes are in great shape just need a little cable adjustment when i put it back together. took the rear off and the rear brakes were frozed solid. took a little work getting them cleaned up. polished up the rims and they look like almost sorta good. shined up pretty good. took the wire wheel and stripped the rear swing arm and arms down to bare metal. gave them a nice fresh coat of black. tried adjusting the clutch, but i think i need a new lever assembly. way too much play in the lever and shouldered bolt is gone. will pick one up tomorrow.

is the kill switch working/ wire shorted out? i guess i don't quite understand what is going on? are you saying you are not getting any spark? i had to clean and adjust the points. i have it running now. just got the clutch pieces in today. had to put it on hold. wife got really sick over the holidays. i just ordered new nobbies and tubes. should be in wed. need to go through the brakes too, but won't order anything until i check them out. gonna clean the rust out of the tank tomorrow too. getting close.

thanks for the info. now the big question-where can i get a clutch for it? found clutch o ring for 10 on ebay, but i need the fibers and steels.

sorry, forgot to post engine #. 367-409270. can someone let me know what this is out of?

looking for a source,other than ebay, for parts. i need to replace the clutch, fibers and steels. can someone point me in the right direction? thanks in advance. on another subject, i picked up a couple more toys. 1997 kx125 (only gave $300 for it and it is in awesome condition). tracked down most of the parts for it and should be running it around soon. also got a 1988 suzuki lt230s 4 wheeler. gave 250 for it and got her running today. shifter was broke, had to drill it out and rig up a new pivot ball and carb was nasty. rebuilt it too. i was doing donuts in the snow in the front yard. had a blast. kids can't wait to get their hands on it.

frame is monoshock, 2j5- vin. all of the info i have researches says yz80. the gt's that i have seen all have external shocks, not monoshock. can someone tell me what i do have for sure?

she fired up after about 100 kicks. after cleaning points, coil was shooting a real nice spark. squirted in a little race fuel off of the buell, and putt putt putt, she ran and actually sounded real good. clutch pushrod should be here tomorrow. gonna run to the local bike shop and pick up a chain and rob the sprocket off of one of the gt's. have the tank soaking in solvent. so far so good. son is wicked happy!!!!

we took the yz apart. no spark at all. coil is good. kicker is missing, shifter is missing left engine cover was not bolted on, clutch pushrod is missing also. checked out the coil, it is ok. points are opening, but i think the signal is weak. put a fluke on the coil wire, getting a signal, but very low voltage. gonna pull the stator off and replace points. carb needs a good long soak. clutch cover bolts are seized, soaking them. couple came loose with an impact driver, but don't want to strip the rest out like the previous owner tried to do.

i guess not. no one has anything to say so i will junk them out.

newbie here. just want to thank everyone in advance. i am new to the vintage bike restoration and was looking for some advice. . after spending hours on the playstation everyday having absolutely no interest in anything in the garage, i brought it upon myself to buy 4 "vintage" dirtbikes/enduros to try and restore together. the first is a 1975 yamaha dt100. picked her up for $75 and spent about an hour to get her running. runs great, starts with one kick, but needs a clutch. this bike is too big for him so i found a 1978 yz80. my real question is what is this thing worth? anything at all? tried and tried to research history. all i found is it is the first year for the mono shock and thats about it. read that is a great beginner bike and that is what i am looking for. i came across 2 1974 gt80's too. can anyone steer me in the right direction. should i rob from the gt to make the yz better, or try to restore them both? like i said at the beginning, thanks in advance. i am a member of a chopper forum and have received some great help from others. some good advice and maybe some good parts sites or sites with some good pics to compare and see what all is missing would be great too.