84. Yz 100 2 stroke won't run

Nathaniel _sheets
Edited Date/Time 5/5/2017 11:48am
Hey guys I'm new to this forum but anyways I recently bought a 84 yz 100 2 stroke for $100 off of a friend that wanted it out of there yard so I bought a set of rings for the bike put them in cleaned the carb and it would not run but kicking it so I rolled it off a few times and it Finally cranked and ran for about 10 seconds and was taking gas good ran and sounded good and then it died and I tried everything to get it to crank back and it won't do nothing doesn't even act like it wants to run now and it's getting fire and it's getting gas and has compression enough to blow my finger off the plug hole when I kick it over and it has a new spark plug in it as well I'm just kinda stuck right now idk wht to do at this point hopefully u guys can give me a idea of wht to try and wht I'm doing wrong thank
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avmechanic
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avmechanic 2/18/2017 10:22am
2/18/2017 10:22am
Make sure the Pilot jet is for sure clean. I picked up a barn find YZ100 years ago and had some similar problems. I had cleaned the carb well but the pilot jet has tiny holes in it and I just could not get it cleared. I grabbed a new one from the Yamaha shop and put it in the carb. Ran beautifully after that. I would really love to find another one of those bikes. I really liked it. They are rare up here in Canada. Good luck.
Greg
Nathaniel _sheets 2/18/2017 11:01am
2/18/2017 11:01am
Ok I'll try that maybe that is it because the one time it did start was when I was giving it throttle and they are really rare here in the US to in North Carolina where I'm at its kinda like the old yz 490 they where everywhere and now they're almost impossible to find
Tbteam
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Tbteam 2/18/2017 12:44pm
2/18/2017 12:44pm
Just in case, I need to mention that I'm looking for a YZ100 for my buddy to race at Diamond Don's in April. You wouldn't sell it, would you?
Nathaniel _sheets 2/18/2017 3:31pm
2/18/2017 3:31pm
Tbteam wrote:
Just in case, I need to mention that I'm looking for a YZ100 for my buddy to race at Diamond Don's in April. You wouldn't sell...
Just in case, I need to mention that I'm looking for a YZ100 for my buddy to race at Diamond Don's in April. You wouldn't sell it, would you?
Well I might but I'd rather trade for another bike if anything preferably a 2 stroke but 4 stroke is fine to me to

The Shop

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Tbteam
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Tbteam 2/19/2017 6:00pm
2/19/2017 6:00pm
Tbteam wrote:
Just in case, I need to mention that I'm looking for a YZ100 for my buddy to race at Diamond Don's in April. You wouldn't sell...
Just in case, I need to mention that I'm looking for a YZ100 for my buddy to race at Diamond Don's in April. You wouldn't sell it, would you?
Nathaniel _sheets wrote:
Well I might but I'd rather trade for another bike if anything preferably a 2 stroke but 4 stroke is fine to me to
What are you looking for? I have a few two stroke vintage bikes, and a really nice 04 CR125.

I could pay cash if the bikes nice. text me info

386-290-9888
mxrose3
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mxrose3 2/20/2017 9:51am
2/20/2017 9:51am
wait.... the last year of production for the YZ100 was 1983.

Can you show us a pic?
Tbteam
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Tbteam 2/20/2017 11:36am
2/20/2017 11:36am
I've seen a pic of the bike and I honestly don't know what the model and year is. Definitely not an 84 YZ100.

it's a twin shock with non-yamaha plastics.
Nathaniel _sheets 2/20/2017 12:24pm
2/20/2017 12:24pm
I'm wondering the same because once I looked at pics of other bike that model that ant it and I know it is a Yamaha 100 but idk wht model it is i can find a pic of a bike like it I was going by wht I was told but idk
Tbteam
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Tbteam 2/20/2017 12:32pm
2/20/2017 12:32pm
Here you go.



MohMoto14
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MohMoto14 2/20/2017 12:41pm
2/20/2017 12:41pm
Tbteam wrote:
Here you go. [img]https://p.vitalmx.com/photos/forums/2017/02/20/177467/s1200_IMG_1869.jpg[/img]
Here you go.



Sweet RT100. Used to have one as a play bike when I was a kid.
GIwasB4
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GIwasB4 2/20/2017 1:04pm
2/20/2017 1:04pm
I was so hoping that $100 was gonna look like this



MohMoto14
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MohMoto14 2/20/2017 1:21pm
2/20/2017 1:21pm
GIwasB4 wrote:
I was so hoping that $100 was gonna look like this [img]https://p.vitalmx.com/photos/forums/2017/02/20/177474/s1200_yz100.jpg[/img]
I was so hoping that $100 was gonna look like this



If you find a way let me know. I'll have to hunt my old one down.
The motor on it has been used by yamaha for years, its a solid old vintage motor. Lots of hope ups available.
AHRMA361
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AHRMA361 2/20/2017 1:22pm
2/20/2017 1:22pm
The RT100 was basically the old MX100 (that came from the older DT100) with different bodywork. Slow, but reliable bikes.

Pit Row

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Tbteam
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Tbteam 2/20/2017 5:45pm
2/20/2017 5:45pm
GIwasB4 wrote:
I was so hoping that $100 was gonna look like this [img]https://p.vitalmx.com/photos/forums/2017/02/20/177474/s1200_yz100.jpg[/img]
I was so hoping that $100 was gonna look like this



That's who I've been talking to today. Think I found one!
haserqui
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haserqui 5/5/2017 8:04am
5/5/2017 8:04am
GIwasB4 wrote:
I was so hoping that $100 was gonna look like this [img]https://p.vitalmx.com/photos/forums/2017/02/20/177474/s1200_yz100.jpg[/img]
I was so hoping that $100 was gonna look like this



Have one of this, cant start it. From philippines
a22
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a22 5/5/2017 11:46am
5/5/2017 11:46am Edited Date/Time 5/5/2017 2:45pm
GIwasB4 wrote:
I was so hoping that $100 was gonna look like this [img]https://p.vitalmx.com/photos/forums/2017/02/20/177474/s1200_yz100.jpg[/img]
I was so hoping that $100 was gonna look like this



Loving these trick YZ100's and the racing of them. Unfortunately, don't think 100cc racing is such a thing here, although would love to wring the neck off a 100 against 125's, that would be fun!

I had/ raced a 79 YZ100F and also a 1981 YZ100H back in the day, aged 12-14- both very fast but maybe did not handle/ turn quite as well as the RM100 of that time, quicker though I reckon and probably would have chose the YZ over the RM. A few luckier riders had the DG heads and other mods also for this era at the time.

I know where there is an 82/83 YZ100, not totally complete but engine/ frame and suspension seems all there and engine turns over. Kind of tempted to go check it out after seeing what people are doing to these and also their rarity.

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