Author Topic: Newly rebuilt LT500 with crazy vibration (defintely not normal) (Read 1507 times)

ZeroZeroMinusOne · « **on:** July 30, 2013, 07:01:40 am »

My cousin just finished a frame up rebuild, we went riding for the weekend and I had the honor of piloting his 500 for a day (boy, do I wish I hadnt). The bike vibrates so badly I thought my eyeballs were loosing up and were going to fall out of my head, I literally couldnt see straight. After half a day on that thing my hands hurt and felt like a million needles were piercing my palms. The bike is literally falling apart from the shaking. Any idea where he should check first? I'm too new to LT's and dont know where to start. My simple mind came to the conclusion that something is out of balance (duh).
Here are a couple of photos of the bike, they prob wont help to answer the question but they are fun to look at.

Gillio · « **Reply #1 on:** July 30, 2013, 07:03:40 am »

Make sure your balancer in timed to the crankshaft correctly.

1986QuadRacer · « **Reply #2 on:** July 30, 2013, 07:08:31 am »

That would be my guess too. Might wanna have that looked at. It might be a little hard on bearings. The motors too.

Rider414 · « **Reply #3 on:** July 30, 2013, 07:18:10 am »

The Suzuki LT500R motor is actually pretty damn smooth and should not be vibrating that bad.

I would pull the clutch cover and check the timing marks (all three) to insure the counter balancer can do its job. I am betting this is the issue.

ZeroZeroMinusOne · « **Reply #4 on:** July 30, 2013, 07:40:04 am »

Thank guys, this what I was thinking also.

ZeroZeroMinusOne · « **Reply #5 on:** July 30, 2013, 09:42:35 am »

The builder of this motor seems to think the flywheel is the cause........we will know soon.

ZeroZeroMinusOne · « **Reply #6 on:** August 14, 2013, 01:14:26 pm »

Update:

Flywheel is fine and timing marks are all lined up. The builder is now going to split the cases to make sure all seals and bearings are okay.
Any thoughts on what else it could be?

Rider414 · « **Reply #7 on:** August 14, 2013, 01:35:22 pm »

The crank is not balanced; IE the crank webs are misaligned or have moved.

ZeroZeroMinusOne · « **Reply #8 on:** August 14, 2013, 03:06:02 pm »

I hope the builder knows to look for that.

LT250RWV · « **Reply #9 on:** August 14, 2013, 03:37:08 pm »

I went threw this on my lt250. My problem was crank journals were bad let the crank slide side to side I would check what the other guys have said. But if that all good check the journals.

LT250RWV · « **Reply #10 on:** August 14, 2013, 05:04:26 pm »

I meant bad main bearing pocket had to have inserts put in to fix my problem . Thats what was causing my vibration

ZeroZeroMinusOne · « **Reply #11 on:** August 14, 2013, 05:12:28 pm »

Thanks guys for all the input, I'll be sure to report back with an update.

B_Fuss · « **Reply #12 on:** August 14, 2013, 05:50:15 pm »

I had a vibration ended up being loose motor mounts swing arm and lower mount

ZeroZeroMinusOne · « **Reply #13 on:** August 17, 2013, 07:00:16 am »

According to the builder, he checked both sides of the motor (no case splitting), all timing marks were already lined up, put everything back together and miraculously the vibration stopped. He obviously doesnt wanna own up to his mistake and say what the issue was.....jerk

Gillio · « **Reply #14 on:** August 17, 2013, 09:46:49 am »

Yup, his pride was out of alignment. I missed a punch mark once. It chugged like a Harley. My pride was hurt. lol

QuadMan8 · « **Reply #15 on:** August 17, 2013, 10:32:49 am »

Well at least its fixed and was not a major tear down. Now go enjoy.

Kyle T · « **Reply #16 on:** August 17, 2013, 10:37:39 am »

Who is this "builder"?

ZeroZeroMinusOne · « **Reply #17 on:** August 17, 2013, 01:30:06 pm »

Builder is in a small shop in PA. If it were mine I would have sent it a site sponsor. The vibration was nothing like that of a Harley, it was more like the fast sharp vibration. Almost like cell phone vibration but a thousand time amplified.

Kyle T · « **Reply #18 on:** August 17, 2013, 01:31:54 pm »

Warn others.

WestTexasKing · « **Reply #19 on:** August 17, 2013, 01:37:03 pm »

That's kinda what this thread is doing, no?

Kyle T · « **Reply #20 on:** August 17, 2013, 01:41:10 pm »

Yes, but if you don't know who to avoid, how can you avoid them?

WestTexasKing · « **Reply #21 on:** August 17, 2013, 01:52:41 pm »

Avoid small shops in PA!
LOL

Kyle T · « **Reply #22 on:** August 17, 2013, 02:16:51 pm »

Easy for me.

ZeroZeroMinusOne · « **Reply #23 on:** August 17, 2013, 07:34:09 pm »

I don't want to put the guy on blast but ill say he's in Easton.

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Author Topic: Newly rebuilt LT500 with crazy vibration (defintely not normal) (Read 1507 times)

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