Help! Changed timing chain, now wont run! - Suzuki Z400 Forum : Z400 Forums
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post #1 of 13 (permalink) Old 06-28-2018, 07:13 PM Thread Starter
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Help! Changed timing chain, now wont run!

Bike was running great before i tore her down. Put a new cam chain in, almost positive my timing is dead on. Slapped it back together, and im getting nothing. Plug is wet, plenty of gas in tank, sparking good, and not even a try to fire. Most i could get was a little "blub" from the exhaust, almost like it was tryn to fire, but not. Im lost, ive i everything 10 times over, from what i understand, there is no way to be 180 out. I timed it with the tensioner out, idk if that will make a diff, but this is what my marks look like. Flywheel on the line next to T. Got my 15 pins inbetween 2 and 3, pretty sure thats about level with the head as it can get. Any help appreciated! I did try the old plug and a new plug, no differenxe either way. Both fuel lines hooked up. Help! Changed timing chain, now wont run!-20180628_174637_1530227575767.jpg
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post #2 of 13 (permalink) Old 06-28-2018, 08:31 PM
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check compression

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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 13 (permalink) Old 06-28-2018, 10:28 PM Thread Starter
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Could that be an issue even if there was no problems before changing cam chain? My mcct was all the way in, so i decided to change it even tho it was running fine
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post #4 of 13 (permalink) Old 06-28-2018, 10:50 PM
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valve lash ??

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 #5 of 13 (permalink) Old 06-28-2018, 11:37 PM
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Have to keep the chain tight on the tensioner side when installing the cams, but yeah it looks right. What do the cams look like from the other side (the lobes)? Once the cams are set and tensioner installed, turn it over a couple times by hand, set T mark in the hole, and verify cams are correct.

You’re lining up the line next to the T (not the actual T) in the timing hole on the crank?

Head was off, so new gasket? Yes, compression test would indicate the head not seated right, valve not closing or bent, etc.

Valve lash could be bad for a number of reasons. Shim falls out, buckets switched around, etc.

Only other thing that comes to mind is pinching a wire or something while pulling the motor or parts off of it.

'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.

Last edited by jetmech25; 06-28-2018 at 11:43 PM.
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post #6 of 13 (permalink) Old 06-29-2018, 10:15 AM Thread Starter
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The heas wasnt off, just valve cover, i did NOT change the rubber valve cover gasket. I also pulled the buckets to see what shims were in it, but i only pulled them one at a time and put them back so im 100 percent sure thrre in tje right place. After reading, i belive i might be at zero valve clearance. Gonna run a compression test and check valve clearance today. Gonna try to roll it off with another quad later
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post #7 of 13 (permalink) Old 06-29-2018, 10:17 AM Thread Starter
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I am lined up with the mark next to T as well. NOT the T. I will pull it back apart now the tensioner is in and recheck timing as well
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post #8 of 13 (permalink) Old 06-29-2018, 10:31 AM Thread Starter
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Btw, thanks jetmech, between your answers on other posts, and on mine, u have helped me quite a bit with this change!
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post #9 of 13 (permalink) Old 06-29-2018, 01:33 PM Thread Starter
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UPDATE

checked timing again, still dead on. Pulled valves and my clearances are as follows

INTAKE

Left- couldnt get any shim down to the smallest .12mm under it, recorded as ZERO
Right- .22

EXHAUST

left- .35
Right- .29

All of these didnt fit to perfection, so i kinda guessed between the last size i could get under it, and the next size i couldn't get under it.

Guessing valve clearance is the issue? But cams had the same size shim under both valves, and there hot cam shims.
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post #10 of 13 (permalink) Old 06-29-2018, 01:34 PM Thread Starter
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Low compression because the one intake valve is being held open?
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post #11 of 13 (permalink) Old 06-29-2018, 05:30 PM
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Yep, blows right out the exhaust instead of being held in the chamber. You can swap shims at most shops for free. Might take you a couple trips to get it right.

If you go to “tools, advanced search” and look for “valve shim calculator”, you can put in what shims and clearances you have and it’ll tell you what sizes you need.

'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.

Last edited by jetmech25; 06-29-2018 at 05:34 PM.
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post #12 of 13 (permalink) Old 07-02-2018, 12:48 PM Thread Starter
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Wham, bam, thank you ma'am put my valves in spec and its game on! Fired right up, new chain sounds like buuuuudddddeeeerrrrr. Thanks a ton
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post #13 of 13 (permalink) Old 07-02-2018, 08:26 PM
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Quote:
Originally Posted by Aspradlin9189 View Post
Btw, thanks jetmech, between your answers on other posts, and on mine, u have helped me quite a bit with this change!
Anytime! Rather than crushing candy and the other time-wasting things people use their phones for, I come here and attempt to help. I’m no guru and am often wrong, but sometimes not. Glad I could help!
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'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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