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Old 06-19-2013, 11:55 AM
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1980 Suzuki pe175 dirtbike

I know this is a slightly enrelated topic, but i'm looking for some help with my bike. It's an early 80's Suzuki PE175 with a powerband, runs alright for it's age and shape, but it bogs down like hell from time to time. also, i have almost no power in 5th and 6th gear. up until those gears, it runs great. i heard that you need to have compression on the exhaust pipe on two strokes, but i'm not entirely sure. there is a leak where the exhaust header meets the block. i mix gas and oil at a 20:1 ratio, like the manual says to do, topped off the tranny flued not long ago, i mostly use it for going through fields and in the gravel pits. any help would be great. Thanks.

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Old 06-19-2013, 12:08 PM
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My first guess would be the reed valves may need replaced due to it's age. Some reed valves are a composite material and some may be a metal like stainless. I don't know which you have but would guess they are not sealing correctly.
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Old 06-19-2013, 02:51 PM
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Change over to a synthetic oil and mix 50:1.
Try different gaps on a new spark plug.
If you're using an air filter, make certain it is not restricting the air flow into the carburetor.
Replace the spark plug wire and boot and coil.
Buy premium fuel.
Smaller sprocket on the transmission or larger sprocket on the rear wheel or both will prevent lugging the motor in top gears.
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Old 06-19-2013, 03:51 PM
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sorry if you have a powerband, Sad to say time to rebuild it! Good luck
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Old 06-19-2013, 11:01 PM
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The P.E. is the enduro version,very tame.First CLEAN THE AIR FILTER!!!!
what you mean about powerband is what we call riding on the pipe.
You lose this ability to ride the pipe when the cylinder gets worn,it only makes good power at the very end of the RPM range. also the crank seals start to leak and that causes bottom end to lessen.
The 2 stroke engine uses an expansion chamber(thats a header for 2 strokes)if the pipe is badly damaged or has been replaced with a straight pipe,the engine will be a dog.
The newer style rebuildable mufflers are a good upgrade.
I dont remember the 1980 PE having a 6 speed?
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Old 06-19-2013, 11:06 PM
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as for fuel,DO NOT USE any fuel that has ethanol! alcohol does not mix with oil.
another thing to consider is mixing the oil 32:1 and dropping the needle one notch in the carb,and sorry,I remember my friends PE 250 had a 6 speed
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Old 06-20-2013, 10:03 PM
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I'm not entirely sure of the year or exact engine specs. I got the bike off of my brother who got it off of my uncle who used it to rip around his farm. I don't really want to put any money into it, i've got gas for my truck, and other projects to work on. I figured it might be either the carb or air cleaner. i had to get another float for the carb, which i didn't think would affect the power, but the air filters in the box look kinda old and ratty, so that could be it. I'm mostly just going to use the bike as a ditch-banger, whatever you want to call it, so i don't mind a little bit of engine issue. i thought that i could try a bit of octane boost in the fuel, see if that helps at all. other than that, i can't really expect it to run like a top the way i drive. thanks to all for your help.
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Old 06-20-2013, 10:39 PM
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i tell you this , a ditch banger in these parts only gone a get ya $50 if you lucky !! Restored it -you got $500 maybe $600 after $1200 in in the restoration . So a ditch banger she be!! if you do not care so much sea foam thru the carb till it is a cloud of smoke ,then stop!! run the ***** out like you stole from the farm from your bother & uncle !

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Old 06-21-2013, 05:10 AM
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Two things about octane boost for your bike
dont waste your money ,it doesnt work
second,the bike is about 8:1 cr,it does not need high octane fuel

MOST IMPORTANT!!! dont use fuel with ethanol as it does not mix with oil. 2 stroke engines use a premix of oil in the gas.Yours calls for 20 parts gas to one part 2 stroke oil.
You can use premium premix at 32:1 but rejetting or dropping the needle one position to get the correct a/f ratio. air filters are critical to the performance of the engine
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Old 06-21-2013, 12:01 PM
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Vinnie is correct; a lot of the vintage snow machines here have terminal issues with mid-grade gas with ethanol in it. Just run a non ethanol gasoline.
Anyone else remember adding Klotz or Blue Thunder to your tank to be more 'bad ***'?

Does your bike have an expansion chamber on it? Or has someone fitted a straight pipe?

It should be a reed cage setup. Make sure the reeds are in good shape. The premier reeds used to be Boyesen Power Reeds. They were like a fiberglass/plastic material.
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