Author Topic: Ltr motor problem (Read 10544 times)

Quadracer87Man · « **on:** June 21, 2013, 11:52:26 pm »

So I have a 2006 LTR just paid to have the top end redone got it back rode it for whole day no problems. hauled it home went to start it to run into garage and no start acted like battery was dead turned over real hard so i tried pull starting it had it in high gear and still locked tires up pull starting so I parked it took valve cover off to find out timing chain was stretched and jumped a few teeth. so I put new timing chain in had head checked and piston checked and nothing wrong put back together and turns over like theres no spark plug in it and has a slight little pop through exhaust. someone told me the web cams in it are noted to spin the gears on the cam shaft but idk?

JayTater · « **Reply #1 on:** June 22, 2013, 03:12:17 am »

Compression check?

Buckeye513 · « **Reply #2 on:** June 22, 2013, 04:27:59 am »

Is the kill switch set to run?

Gillio · « **Reply #3 on:** June 22, 2013, 06:04:35 am »

Bent valve. Do a leakdown test. TDC and shoot air down the plug hole and I'm willing to bet you going to hear air hissing in the exhaust. Also listen in the intake and crankcase for air hissing.

Quadracer87Man · « **Reply #4 on:** June 22, 2013, 12:14:50 pm »

how do you do a compression check on a 4 stroke when it has its own release lever? and next thing will be a leak down test but very odd it was running fine the whole day then found out it had the stretched timing chain and had th head and valves and piston checked right away and nothing wrong there. and still starts up like theres no compression now

JayTater · « **Reply #5 on:** June 22, 2013, 12:21:02 pm »

Comp release can't be disabled? I'm not sure, never worked on the LTR.

Quadracer87Man · « **Reply #6 on:** June 22, 2013, 01:47:05 pm »

I don't know either theres a little decompression arm in there that's in sync with the cams

PCS · « **Reply #7 on:** June 22, 2013, 01:48:38 pm »

the ltr comp release is a simple design. if you check it, just make sure the spring returns it to the resting position when you rotate it. not a common fail point.
i would check your valve timing, set piston to TDC, exh cam should be set with the timing marks at 9 and 12 oclock, intake cam should be at 12 and 3 o clock. cam chain should have 15 pins between both 12 o clock timing marks. the exh cam lobes should be pointing around 10 o clock and the intake lobes at 2 o clock.
connect a spark plug tester inline with the plug and wire to visually verify juice getting to the plug.
check the ignition fuse next to the battery, 10a or 15a i believe.
to check fuel, you can pull the injector out and try to start motor, you should see a fine mist of fuel come out. if it dripples, then its dirty.
also, some times the battery will have enough juice to crack the motor but not enough to fire up the fuel injection system and the motor will crank but not start, make sure battery is good.

PCS · « **Reply #8 on:** June 22, 2013, 01:50:47 pm »

forgot to mention that the decompressor is on the exh cam and is bolted in place to the center of the cam.

Quadracer87Man · « **Reply #9 on:** June 22, 2013, 06:41:54 pm »

once the cams come back from web ill check that stuff thnx

PCS · « **Reply #10 on:** June 26, 2013, 01:49:11 pm »

good luck, ltr motor themselves are to difficult to work, most problems come from dirty fuel systems issues or a weak battery.

LT250RWV · « **Reply #11 on:** June 26, 2013, 03:16:58 pm »

Did you have the valves re shimmed .My friends trx 450r wouldn't run after he done a rebuild to a 500 big bore and stage 2 hotcams. He had wrong shims under the valve and the valve wouldn't close. Hope this helps

Quadracer87Man · « **Reply #12 on:** June 27, 2013, 12:33:17 pm »

i gotta list sarted now for things to check thanks to you guys hopeing the cams were the problem and it runs again but if not i gotta go back to drawing board, i had the dealer look at the head and he said he seen nothing wrong with it or the valves so not shir

Gillio · « **Reply #13 on:** June 27, 2013, 12:44:03 pm »

They looked at the head after you had it jump time?

Zilla273 · « **Reply #14 on:** June 27, 2013, 02:43:41 pm »

id say bent valve as well, prob an ex valve, I just put a transmission in an 2007 ltr. I thought it was fairly simple to do the engine, but getin engine out of chassis was a B!@CH

Quadracer87Man · « **Reply #15 on:** June 28, 2013, 10:24:05 pm »

yes head was just inspected after this whole problem said he didn't see nothing wrong with the valves, and yea they got 50lbs of **** in a 10lb container

PCS · « **Reply #16 on:** July 03, 2013, 12:06:35 pm »

i have a good set of stock ltr valves if you need replacements

Quadracer87Man · « **Reply #17 on:** July 07, 2013, 07:28:09 pm »

I will keep that in mind, hopefully these are good. thank you

Quadracer87Man · « **Reply #18 on:** July 08, 2013, 10:46:25 pm »

yea its beginning to be a pain I had local dealer send the cams back to web to make positive it wasn't those and its been almost 2 months now no idea where they are

PCS · « **Reply #19 on:** July 09, 2013, 02:42:04 am »

Call Web directly to find out

Rider414 · « **Reply #20 on:** July 09, 2013, 01:26:23 pm »

I believe some of those dealer mechanics shouldn't even work on lawn mowers.

PCS · « **Reply #21 on:** July 09, 2013, 01:56:22 pm »

haha

Quadracer87Man · « **Reply #22 on:** July 11, 2013, 04:57:21 pm »

did call web they didn't have any recollection of them being there

Gillio · « **Reply #23 on:** July 11, 2013, 07:34:40 pm »

I would doubt that you have any problems with the cams, unless they didn't weld the sprockets to the camshaft and they spun. I believe the are a press fit then you weld them after you set your camshaft degree. If they did spin it would have bent the valves. The valves need to be pulled and checked with a dial indicator.

Quadracer87Man · « **Reply #24 on:** July 11, 2013, 09:35:45 pm »

that's what the dealer said is the gear probably spun that's why he sent them out I guess, said he tore the head all apart and put back together and said all looked good besides rossiers national porting, said it looked like someone took a chisel to it

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Author Topic: Ltr motor problem (Read 10544 times)

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