Elstar Tank 250cc Pushrod - Wont Crank

Ruddles75 · 02-07-2021, 05:14 AM

Hi All,

I am working on my Dads roughly 8 year old Elstar Tank Quad.
Its a 250cc Pushrod OHV Air cooled engine (CG250??)
It cranks fine with the Spark Plug out but wont turn over with spark plug in.
My Brother Adjusted the valves and replaced positive and negative leads and connections
Removed the exhaust in case of blockage.
Changed the Battery, Starter motor and solenoid.
No change to behavior.
No stuck valves that we can see when the valve cover is removed.
A friend that works for KTM said to have a look at the Auto-decompression system - said the small spring can break.
He showed me a CAM from a OHC KTM bike with a spring and a nub on the cam setup that opens the Exhaust valve at cranking speeds.
Would anyone know if the 250cc Pushrod OHV engine has a similar setup?
The Hawk 250 Bike seems to have a very similar engine and I have watched guys upgrade to "Performance Cams" but cant see any kind of Auto-Decompression System.

Any Ideas would be appreciated.

02-07-2021, 05:14 AM	#1
Ruddles75 Join Date: Feb 2021 Location: Camden Posts: 1	Elstar Tank 250cc Pushrod - Wont Crank Hi All, I am working on my Dads roughly 8 year old Elstar Tank Quad. Its a 250cc Pushrod OHV Air cooled engine (CG250??) It cranks fine with the Spark Plug out but wont turn over with spark plug in. My Brother Adjusted the valves and replaced positive and negative leads and connections Removed the exhaust in case of blockage. Changed the Battery, Starter motor and solenoid. No change to behavior. No stuck valves that we can see when the valve cover is removed. A friend that works for KTM said to have a look at the Auto-decompression system - said the small spring can break. He showed me a CAM from a OHC KTM bike with a spring and a nub on the cam setup that opens the Exhaust valve at cranking speeds. Would anyone know if the 250cc Pushrod OHV engine has a similar setup? The Hawk 250 Bike seems to have a very similar engine and I have watched guys upgrade to "Performance Cams" but cant see any kind of Auto-Decompression System. Any Ideas would be appreciated.
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