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Old 05-28-2019, 08:46 PM
Tilly212 Tilly212 is offline
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Default Help with tillotson 212 stage 2 upgrades

I recently bought a 212 tolillotson hemi engine, and removed govenor, installed hot .265 cam, and tct carb. It wont start but backfires and pops out of the header pipe.

Anything I should look at specifically as to why it's doing this? Tips? Anything would be well appreciated!
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Old 05-28-2019, 08:57 PM
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Uh oh.

Did you follow a build guide or just wing it?
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Old 05-28-2019, 09:00 PM
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Eh..kinda winged it. I talked to some people and they think it's the valve timing. With the cam it said to lash the valves to .003. But I didn't do that. Would that little bit cause something like this?
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Old 05-28-2019, 09:06 PM
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That's what it sounds like to me--valve timing.

Incorrect valve lash, like too much valve clearance, would make it hard to start because the valves wouldn't be opening and closing at just the right time.

The latter issue could do it too, esp if it's way off spec. I bet you don't have a set of feeler gauges, do ya?
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Old 05-29-2019, 06:24 AM
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Do have feeler gauges. But can't find anything on tillotson 212 on have to set the valve lash.
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Old 05-29-2019, 06:37 AM
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Do you have the owner's manual for it?
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Old 05-29-2019, 06:39 AM
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But would .003 off cause that? Seems too small to be an issue.

---------- Post added at 06:39 AM ---------- Previous post was at 06:38 AM ----------

I do not have an owners manual.
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Old 05-29-2019, 06:50 AM
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Quote:
Originally Posted by Tilly212 View Post
But would .003 off cause that? Seems too small to be an issue.

Oh, yes it could!!
When you put the cam in, did you make sure to perfectly line up the timing marks?
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Old 05-29-2019, 07:16 AM
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What valve lash does the cam call for? That is what the lash needs to be set to. And check the timing. Also, did you install new lifters when you swapped the cam?
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Old 05-29-2019, 07:22 AM
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I set my valves at zero lash because as the engine heats up it grows and creates more lash. I’d start with the valve lash and if that didn’t fix it I’d pull the side cover and make sure the dots on the cam and crank are lined up.
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Old 05-29-2019, 08:02 AM
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Quote:
Originally Posted by J.S.@SMS View Post
What valve lash does the cam call for? That is what the lash needs to be set to. And check the timing. Also, did you install new lifters when you swapped the cam?




Quote:
Originally Posted by Tilly212 View Post
With the cam it said to lash the valves to .003. ?
Does that answer your question?
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Old 05-29-2019, 04:30 PM
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I got it running for a little bit. Feels like it ran at high rpms in idle. Then tried it again and it has that cammed sound , but doesn't run for more than 3 seconds. And it was the valve lash! I had a personal epiphany at work about it. It all made absolute sense. Thank you every one for the comments. Now to get it keep running...maybe fuel/air issue? Idk..
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Old 05-29-2019, 07:41 PM
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I'm pretty sure I set the cam correctly, but i can check tomorrow. Thanks man.

---------- Post added at 07:41 PM ---------- Previous post was at 07:40 PM ----------

Did not install new lifters
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Old 05-30-2019, 07:00 AM
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It's usually a good idea not to reuse the old lifters with a new cam, especially a bigger cam. Flat tappet lifters are like rings, they need to be broken in (usually done in 20 minutes of use), and each cam causes a different wear pattern. So when you re-use the old lifters with a new cam, the new cam tries to leave it's own wear pattern on the lifters, and the two don't often get along. Also, new Tillotson lifters are 90 cents each + s&h.

https://www.gopowersports.com/tillotson-lifter/
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Old 05-30-2019, 09:43 AM
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I think I originally ran it stock for less than 5 minutes though...
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Old 05-30-2019, 11:56 AM
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In automotive engines I’ve always replaced the lifters with a new cam, but I never have on one of these and I haven’t had a problem yet. The motor on my outlaw kart has used lifters in it with 36lb springs and I turn it 9000rpm regularly.
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Old 05-30-2019, 06:34 PM
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How do I adjust intake and exhaust valve timing?
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Old 05-30-2019, 06:45 PM
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They are set to the perammeters of the grind of the cam... You cannot change it...
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Old 05-30-2019, 07:32 PM
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I'm so fed up with this crap! I dont get it. Set valve lash, but wont run for more than 3 seconds...
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Old 05-30-2019, 07:51 PM
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You have spark and it actually runs for a short bit????

If the gov is removed(completely Im assuming), How do you have the throttle setup to the carb??.... Lets see some pics of this...

I would suspect that cause the gov is removed, the butterfly is closing completely and shuts the air supply off.....Kinda like forgetting the little spring on a regular clone carb setup....

Maybe open the vane a bit by screwing the idle screw in a short bit.... Keeps it cocked open a bit...
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