Z400 Hard To Start Or Wont Start When The Engine Is Cold? - Page 2

biggiej42 · 07-25-2011, 06:11 PM

It's not necessary to replace the tensioner. Just make sure you reset it and torque it properly.

scott_z400 · 10-09-2011, 12:49 PM

hey my 04 z400 got to the point it was hard to start cold and was ticking so i put a new did timing chain in it, now that i put it back together i only have 30psi. compression i check the timing 6times its right. do you think i may just need to shim my valves or do they need replaced? oh and before i did the timing chain the intake valves where still in clearence at like 15mm? thanks

CFM-Z440 · 10-09-2011, 01:40 PM

Quote:

Originally Posted by scott_z400

hey my 04 z400 got to the point it was hard to start cold and was ticking so i put a new did timing chain in it, now that i put it back together i only have 30psi. compression i check the timing 6times its right. do you think i may just need to shim my valves or do they need replaced? oh and before i did the timing chain the intake valves where still in clearence at like 15mm? thanks

15mm would be way out of spec, I think you forgot a decimal point. If your valves are in spec, and your compression is low, you may have a bent valve, or you may not have got the cam timing right, which hopefully doesn't result in a bent valve.

However, if your valves ever lose clearance to the point of more than a couple thousandths of an inch, they need replaced. Say for example you find you have zero valve clearance on an intake valve, re-shimming might last you a day and clearance will be lost again. If you ever find one at zero, it needs replaced.

Karpatheus · 10-09-2011, 02:35 PM

hmmmm, i had a problem with my starting before i overhauled the engine, its not always the valves....mine happen to be the rings. i replaced then an it was like new again. but i then later when back into it an put bigger stuff in it.

scott_z400 · 10-15-2011, 06:55 PM

im about to tear into mine tomorrow i think to check it out because it was hard to start cold but once you got it started ran great. so i put a timing chain in it thinking that might be my problem. i know i timed it right but only 30 to 40psi on the comp. tester.. so tomorrow i guees ill see if its valves or not

Chase Garrison4 · 10-28-2011, 03:06 PM

I recently rebuilt the carb on my z400. Now its really hard to start cold and it won't start at all if its choked. After it starts and warms up it will idle great and run great until you try to open it up then it starts spitting and sputtering and won't open up much at all...any idea what might be the problem?

scott_z400 · 11-09-2011, 02:31 PM

alright well i tore my down and had a stuck ring.. so new piston and rings put it back together.. mind you i check my valves before tear down they were all in spec.. put the motor back together and the intake valve is actually hold one of the intake valves open and the other only has .05mm but both exhaust are fine.. any idea what happened here?

Mudslinger11 · 11-09-2011, 03:35 PM

Did you switch the buckets? Also after everything is torqued to spec., spin the motor over a few times before you check the valves.

scott_z400 · 11-09-2011, 03:49 PM

i spun everthing over and had like 30psi should have atleast 90-100psi with the new piston unseated so i took the shims out of the intake side so it would hold the valve open and i got 100psi.. but had a .40mm gap on both intakes.. so should i just reshim it? because the intake was in clearance before i took the head off.. i had the buckets off but didnt switch them..

scott_z400 · 11-10-2011, 01:22 AM

i think im going to try and reshim

mwatters · 12-26-2011, 07:28 PM

It's great to re-read these tips about starting a suzuki z400 as winter approaches. Hopefully people remember to take good car of their bikes - it makes such a difference

07-25-2011, 06:11 PM	#16 (permalink)
biggiej42 :::Official Spammer::: Join Date: Jun 2006 Posts: 3,399	It's not necessary to replace the tensioner. Just make sure you reset it and torque it properly. __________________ 05' Z434 12.5:1CP,Full Yosh TRC,FCR40,175/45,Rat Stack,Dyna Programmable,AMR Coil,KW Valvetrain,536/540 Web's,DID Tchain,PWR Radiator,Raptor petcock,Gunnar Kill,Elka S3 Front+Rear w/link,Roll+1 Stem,GPR Stabilizer,SL Hyd.Clutch,Tag T2,LSR+3 Arms,Burgard+1 Swinger,Quadtech Rad Shrouds,Supersprox 14/40t,UM Air Box,YFZ Calipers,SS Lines,PA Bumper,Asv's,Roll Nerfs/Heels/Pegs,LSR Axcalibar,Douglas G2 Beadlocks/Razr's,Hid,YFZTail,Pwrmadd's,TT Vapor+Dash,CV4's,RickyStator. July 2011 QOTM

10-09-2011, 12:49 PM	#17 (permalink)
scott_z400 :::Rookie Rider::: Join Date: Oct 2011 Location: michigan city, Indiana Posts: 7	hey my 04 z400 got to the point it was hard to start cold and was ticking so i put a new did timing chain in it, now that i put it back together i only have 30psi. compression i check the timing 6times its right. do you think i may just need to shim my valves or do they need replaced? oh and before i did the timing chain the intake valves where still in clearence at like 15mm? thanks Last edited by scott_z400; 10-09-2011 at 12:51 PM. Reason: forgot a part

10-09-2011, 02:35 PM	#19 (permalink)
Karpatheus :::Mini LT80 Rider::: Join Date: Mar 2007 Location: Orange, Texas Posts: 235	hmmmm, i had a problem with my starting before i overhauled the engine, its not always the valves....mine happen to be the rings. i replaced then an it was like new again. but i then later when back into it an put bigger stuff in it. __________________ 03 DRZ 434, New stage Hotcams (intake & Exhaust), Port & Polish, Kibblewhite Valves, DRZe Springs and gasket, Athena 434, Athena 12:3:1 Compression Piston, Fcr39 carb (170 jet, 45 pilot), ESR Intake Kit, +2 JD A arms, +2 Houser Swing Arm, Elka Front Long Travels, Elka Rear, Pro Armor Nerfs, Standard Moose Racing Handle bars, Black Laker Plastics, Monster Green Power Coated Frame, Rear Douglas Bead Locks.

11-09-2011, 03:35 PM	#23 (permalink)
Mudslinger11 :::LT500 Rider::: Join Date: Jan 2009 Location: new york Posts: 1,175	Did you switch the buckets? Also after everything is torqued to spec., spin the motor over a few times before you check the valves. __________________ 03'LTZ462,Port/Polish by TTM, KW valves, Drz springs,TT flywheel, HO Stator, PD impeller, NSHC, DMC exaust, FCR39, flex skrew, FCI intake, np dyna, Elka piggyback fronts, pc frame trans blue, pro armor nerfs, dg skids,bumper, frame guards, prm grab bar, maier plastic, one graphics, tusk xc rims, holeshot hd, braided steel brake lines, x-bars, power madd guards, drd's , moose duel gasser, asv levers, fly start button, PD kill with relay, tusk gas cap, raptor petcock, raptor battery, TT vapor

11-09-2011, 03:49 PM	#24 (permalink)
scott_z400 :::Rookie Rider::: Join Date: Oct 2011 Location: michigan city, Indiana Posts: 7	i spun everthing over and had like 30psi should have atleast 90-100psi with the new piston unseated so i took the shims out of the intake side so it would hold the valve open and i got 100psi.. but had a .40mm gap on both intakes.. so should i just reshim it? because the intake was in clearance before i took the head off.. i had the buckets off but didnt switch them.. __________________ 04 LTZ400 YOSHIMURA TRS TITANIUM EXHAUST K&N intake Hotcams Pro-x piston kit D.I.D cam chain renthal bars Itp wheels Holeshot tires gripper seat

10-15-2011, 06:55 PM	#20 (permalink)
scott_z400 :::Rookie Rider::: Join Date: Oct 2011 Location: michigan city, Indiana Posts: 7	im about to tear into mine tomorrow i think to check it out because it was hard to start cold but once you got it started ran great. so i put a timing chain in it thinking that might be my problem. i know i timed it right but only 30 to 40psi on the comp. tester.. so tomorrow i guees ill see if its valves or not

10-28-2011, 03:06 PM	#21 (permalink)
Chase Garrison4 :::Rookie Rider::: Join Date: Oct 2011 Posts: 1	I recently rebuilt the carb on my z400. Now its really hard to start cold and it won't start at all if its choked. After it starts and warms up it will idle great and run great until you try to open it up then it starts spitting and sputtering and won't open up much at all...any idea what might be the problem?

11-09-2011, 02:31 PM	#22 (permalink)
scott_z400 :::Rookie Rider::: Join Date: Oct 2011 Location: michigan city, Indiana Posts: 7	alright well i tore my down and had a stuck ring.. so new piston and rings put it back together.. mind you i check my valves before tear down they were all in spec.. put the motor back together and the intake valve is actually hold one of the intake valves open and the other only has .05mm but both exhaust are fine.. any idea what happened here?

11-10-2011, 01:22 AM	#25 (permalink)
scott_z400 :::Rookie Rider::: Join Date: Oct 2011 Location: michigan city, Indiana Posts: 7	i think im going to try and reshim __________________ 04 LTZ400 YOSHIMURA TRS TITANIUM EXHAUST K&N intake Hotcams Pro-x piston kit D.I.D cam chain renthal bars Itp wheels Holeshot tires gripper seat

12-26-2011, 07:28 PM	#26 (permalink)
mwatters :::Rookie Rider::: Join Date: Dec 2011 Location: Pittsburgh, PA Posts: 10	It's great to re-read these tips about starting a suzuki z400 as winter approaches. Hopefully people remember to take good car of their bikes - it makes such a difference

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