1979 suzuki ds125 need help!!! Revs up really high!!

Drake_Gogg
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Drake_Gogg
Hi I have just rebuilt a 1979 suzuki ds125 and when I rode it I noticed that whenever I give it a little throttle it slowly revs up really high. Pls help!!
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camstop22
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camstop22 8/3/2019 12:59pm
8/3/2019 12:59pm
Check crank seal behind flywheel. Probably sucking air,and going lean.
Jim in VA
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Jim in VA 8/3/2019 2:29pm
8/3/2019 2:29pm
Drake_Gogg wrote:
Hi I have just rebuilt a 1979 suzuki ds125 and when I rode it I noticed that whenever I give it a little throttle it slowly...
Hi I have just rebuilt a 1979 suzuki ds125 and when I rode it I noticed that whenever I give it a little throttle it slowly revs up really high. Pls help!!
Don’t ride it until you fix it, could be doing serious engine damage.
Drake_Gogg
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Drake_Gogg 8/3/2019 2:50pm
8/3/2019 2:50pm
camstop22 wrote:
Check crank seal behind flywheel. Probably sucking air,and going lean.
I will check that. If it it leaking do i need to orger a gasket or can i just use liquid gasket.
Jim in VA
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Jim in VA 8/3/2019 3:21pm
8/3/2019 3:21pm
Need to order a seal (buy OEM from dealer), a flywheel removal tool, and have someone who is a pretty decent mechanic replace it. It’s not hard, but you need to be very careful not to get debris into the crankcase, and the seal needs to be driven in correctly. You can probably find a few videos on YouTube, but there’s some bad “how to” videos there too.

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Jim in VA
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Jim in VA 8/3/2019 3:23pm
8/3/2019 3:23pm
Check rubber intake boot for cracking, and bad gasket jobs on intake too. Definitely sounds like it’s sucking air in somewhere.
mwssquad827
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mwssquad827 9/2/2019 8:45pm
9/2/2019 8:45pm
For sure a lean issue... I have a 81 rm and my did the same thing.. my air leak was by the reeds so I used a lil yamalube gasket and boom done.. also I fattened the carb settings.. I did all this at the same time so I’m not really sure which fixed the problem but it is fixed soo. Good luck
mwssquad827
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mwssquad827 9/2/2019 8:46pm
9/2/2019 8:46pm Edited Date/Time 9/2/2019 8:47pm
Ps start it a spray some carb cleaner around gaskets and if it runs then you know where the leak is at...

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