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88 Tundra hard starting, backfiring

Posted: Sun Feb 04, 2007 8:42 am
by brasebear
Ran pretty good (slightly rough/a bit low on power) all last year. In spring filled tank + StaBil, fogged, etc (summerized as usual). This fall a little hard to start, ran OK for day or two in Nov. This weekend went to fire it up and no dice. Plug looked ok and was dishing out blue spark. It'll catch and turn over 6-10 times every 5 pulls or so, then pops 2-3 times, then big back fire. Found crack in the rubber tube from airbox to carb which I'm going to replace today.

Any ideas on what/where else to start to smooth this out?

Thanks, Mike

sick tundra

Posted: Sun Feb 04, 2007 1:10 pm
by Alaskan Polar Bear
Hey Mike
Tony Martin here. (488 1330)
sounds like your sled has a simple problem gonna take a bit to figure it out though
pull the carb off and run your finger accross the piston side/skirt and feel how rough it is.
if it is pretty rough , and it doesn't take much , then you need to hone the cylinder and replace the piston/
I suspect that the split carb boot has been letting snow in and has scored the piston ,
checking the compression won't help
let me know what you find
Tony

Figured it out

Posted: Tue Feb 13, 2007 7:02 pm
by brasebear
Hey Tony,

Thanks for the reply. Here's what I found/did:

Found exhaust had been blown off the back of the engine from the backfiring -- reattached/sprung

Drained carb (looked like baaaaad ice tea with 'stuff' in it)

Drained all fuel from tank with suction pump + all lines

Removed carb and blew 1/2 can of carb/choke cleaner at the whole shebang

Replaced airbox > carb rubber tube with a new one (it was totally torn in 1/2)

Filled tank with fresh fuel

Started on the 2nd pull, and purrs like it never has before. Amazing what stale gas plus gurry in the carb can do. Although this was quite simple/quick, I was pretty leery of pulling the carb off, for fear of hosing something else up. All in all pretty easy job with great results.

Mike