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Enduro Engine 4 stroke (including EFI & Exhaust) 4 stroke engine, EFI, and exhaust discussion

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Old 08-23-2020, 03:24 PM
Gas Guzler Gas Guzler is offline
Join Date: Aug 2020
Posts: 3
Default Drz 400 Cylinder head on 450 fse

Hi has anyone else fitted a drz head on 450fse?
Mine destroyed the original head. ?Snapped valve?.
So I fitted a drz head. The bike was originally hard to start from cold ?2003? model but ok when hot. Now it?s the opposite.i suspect the compression is to high for the starter/ battery as it will start with jump leads, no chance on kick start.
Has anyone else done this conversion or had these starting issues?
Thanks for any info.

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Old 08-23-2020, 09:14 PM
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gasgasman gasgasman is offline
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Location: Pearland Texas
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Make sure the compression release is working.
Sounds like it is sticking.
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Old 08-24-2020, 04:21 AM
Gas Guzler Gas Guzler is offline
Join Date: Aug 2020
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The auto decompressor seems to be working.its action is fine when stripped and appears to work when rebuilt. It?s very awkward to inspect when rebuilt.
I have fitted hot cams but can?t see why they could effect the decompressor.
Seems like the starter and battery are lazy.
A previous owner fitted a later flywheel cover with different starter gears to try and solve starting issues I believe.
Are the starters supposed to turn quite fast?
As mine is relatively slow even when cold.
If it doesn?t fire in first 3/4 attempts then the battery has not enough power but jump it and it fires straight up.
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