New here need help with 04 lt-z400 - Suzuki Z400 Forum : Z400 Forums
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post #1 of 16 (permalink) Old 04-02-2017, 05:00 PM Thread Starter
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New here need help with 04 lt-z400

Hey all, new to this forum. Seeking help with my 04 LT-Z400. It was getting hard to start, but it would start if pulled by another vehicle. Then once it was warm it would start easily with push button. After reading a post on this forum and talking with my buddies, we discovered it might be the valves that need adjusted. So I re-shimmed them. Bike still wouldn't start, tried pull starting... wouldn't start. We did a compression and leak down test and the bike had really low compression. I thought i may have done the valve adjustment wrong, so I broke the bike down again and went through the steps to adjust the valves, I tried to start it up... and nothing. Very confused on the whole shimming thing.
Any help is appreciated thanks!
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post #2 of 16 (permalink) Old 04-02-2017, 05:43 PM
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got spark?

The White Beast
03 ltz400,95.5bore,+5crank,P&P,13.7:1,JE piston,spacer plate,RHC +1 intakes valves,RHC #208in&187ex cams,DRZ manual decomp,DID cam chain,no air box,Sredrum TB 42mm FCR,RAT stack,WB fuel screw,EMN needle,quick shot,06 clutch 450r drive plates w/trx400 ex springs,C2HB,ex thumber,trx450r air boot, Barker Performance pipe, trailteck flywheel,dynatek,NOLOGY HOTWIRES ,nerf bars,450r shocks, +4 swinger,lowered front & rear
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post #3 of 16 (permalink) Old 04-02-2017, 07:37 PM
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Valve timing could be wrong, holding the valve open at TDC, or it could be a bent valve. Either would give you very low compression because the combustion chamber is open. There's a sticky in the maintenance section on adjusting valves with a good how-to write up including pics. What part is confusing?

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
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post #4 of 16 (permalink) Old 04-02-2017, 09:27 PM Thread Starter
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got spark?
yep got spark
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post #5 of 16 (permalink) Old 04-02-2017, 09:33 PM Thread Starter
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Valve timing could be wrong, holding the valve open at TDC, or it could be a bent valve. Either would give you very low compression because the combustion chamber is open. There's a sticky in the maintenance section on adjusting valves with a good how-to write up including pics. What part is confusing?
Thanks jetmech25. I am unsure of why the bike has the shims,(what are their purpose?) I have re-shimmed now 3 times each time different shim sizes. i Have double and triple checked to make sure I put correct size in there. Do you think valve clearance is my only problem?

SKRRRRTTTT Jag on ya a**
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post #6 of 16 (permalink) Old 04-02-2017, 09:42 PM
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Thanks jetmech25. I am unsure of why the bike has the shims,(what are their purpose?) I have re-shimmed now 3 times each time different shim sizes. i Have double and triple checked to make sure I put correct size in there. Do you think valve clearance is my only problem?
yeah well its not the only one using shims . for the manufactures it likely solves a problem.

you valves are shot ,they only last so long and you are there. get the seats cut and new valves . leaded gas will make valves last longer for new ones but could be hard to get, there are gas additives that claim to do the same thing
.

The White Beast
03 ltz400,95.5bore,+5crank,P&P,13.7:1,JE piston,spacer plate,RHC +1 intakes valves,RHC #208in&187ex cams,DRZ manual decomp,DID cam chain,no air box,Sredrum TB 42mm FCR,RAT stack,WB fuel screw,EMN needle,quick shot,06 clutch 450r drive plates w/trx400 ex springs,C2HB,ex thumber,trx450r air boot, Barker Performance pipe, trailteck flywheel,dynatek,NOLOGY HOTWIRES ,nerf bars,450r shocks, +4 swinger,lowered front & rear
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post #7 of 16 (permalink) Old 04-02-2017, 09:52 PM Thread Starter
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yeah well its not the only one using shims . for the manufactures it likely solves a problem.

you valves are shot ,they only last so long and you are there. get the seats cut and new valves . leaded gas will make valves last longer for new ones but could be hard to get, there are gas additives that claim to do the same thing
.
Thanks @cataway
I have only ever run 92 clear, is this what you mean? If i had the seats cut and new valves done at a shop, how much do you think they would run me? Including parts and all that, just your best estimate?

SKRRRRTTTT Jag on ya a**
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post #8 of 16 (permalink) Old 04-02-2017, 10:07 PM
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There has to be the recommended clearance to get the valves to open enough and stay open the correct amount of time. You can imagine if there was too much clearance, they'd barely open. Same goes for no clearance, they'd never shut and you'd have no compression.

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
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post #9 of 16 (permalink) Old 04-02-2017, 10:12 PM
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I can get you phone numbers ,that's about it

The White Beast
03 ltz400,95.5bore,+5crank,P&P,13.7:1,JE piston,spacer plate,RHC +1 intakes valves,RHC #208in&187ex cams,DRZ manual decomp,DID cam chain,no air box,Sredrum TB 42mm FCR,RAT stack,WB fuel screw,EMN needle,quick shot,06 clutch 450r drive plates w/trx400 ex springs,C2HB,ex thumber,trx450r air boot, Barker Performance pipe, trailteck flywheel,dynatek,NOLOGY HOTWIRES ,nerf bars,450r shocks, +4 swinger,lowered front & rear
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post #10 of 16 (permalink) Old 04-02-2017, 10:12 PM Thread Starter
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Oh i see @jetmech25. What is your opinion? do you think my valves are shot? or maybe something else?

SKRRRRTTTT Jag on ya a**
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post #11 of 16 (permalink) Old 04-02-2017, 10:14 PM Thread Starter
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Yeah a phone number would be great thanks!

SKRRRRTTTT Jag on ya a**
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post #12 of 16 (permalink) Old 04-02-2017, 10:25 PM
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Yeah a phone number would be great thanks!
Ron Hamp Cycle

ron has a valve that will last for ever

The White Beast
03 ltz400,95.5bore,+5crank,P&P,13.7:1,JE piston,spacer plate,RHC +1 intakes valves,RHC #208in&187ex cams,DRZ manual decomp,DID cam chain,no air box,Sredrum TB 42mm FCR,RAT stack,WB fuel screw,EMN needle,quick shot,06 clutch 450r drive plates w/trx400 ex springs,C2HB,ex thumber,trx450r air boot, Barker Performance pipe, trailteck flywheel,dynatek,NOLOGY HOTWIRES ,nerf bars,450r shocks, +4 swinger,lowered front & rear
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post #13 of 16 (permalink) Old 04-02-2017, 10:36 PM
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they did a head for me . ron was better

The White Beast
03 ltz400,95.5bore,+5crank,P&P,13.7:1,JE piston,spacer plate,RHC +1 intakes valves,RHC #208in&187ex cams,DRZ manual decomp,DID cam chain,no air box,Sredrum TB 42mm FCR,RAT stack,WB fuel screw,EMN needle,quick shot,06 clutch 450r drive plates w/trx400 ex springs,C2HB,ex thumber,trx450r air boot, Barker Performance pipe, trailteck flywheel,dynatek,NOLOGY HOTWIRES ,nerf bars,450r shocks, +4 swinger,lowered front & rear
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post #14 of 16 (permalink) Old 04-02-2017, 11:01 PM Thread Starter
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Thanks guys

SKRRRRTTTT Jag on ya a**
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post #15 of 16 (permalink) Old 04-02-2017, 11:18 PM
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The symptoms you're describing sound like a valve problem.

'05 Z
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.
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