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Author Topic:   Won't Rev
rpm9595
Dirt Roller

Total posts: 11
posted May 15, 2005 01:00 PM  
79 MC 350 .060 over 350 with 6.83 gears DOT tires solid cam .550 lift 230 duration 882 heads 2 barrel rocht carb. Motot will not rev passed 5500 on a 4/10 mile track. pulls out of coners but is flat down the strates. We have gone over all adjustments we can. Stumped by the way it turned 6800 3 weeks ago under power but runs like a tractor now, bout as fast too! HELP!!!

Raceman17
Dirt Maniac

Total posts: 165
posted May 15, 2005 01:52 PM  
Maybe you are floating the valves. DO you have good springs in the motor? What is your seat pressure of the valves?


rpm9595
Dirt Roller

Total posts: 11
posted May 15, 2005 02:59 PM  
I don't know Raceman that what I was thinking but my pit boys thnk it's eveything from gears to bad lugnuts lol. Looking for ideals before the old try everthing frist. Thanks for your input. 95

STREET16
Dirt Maniac

Total posts: 158
posted May 15, 2005 06:26 PM  
If it's floating valves it will start popping at higher RPM's. If it just "goes flat", I would start looking into a carb/fuel problem, and it sound a little like trash in the carb. If you have a spare carb, or can borrrow a spare, try swapping them first.

rpm9595
Dirt Roller

Total posts: 11
posted May 15, 2005 07:53 PM  
16, That makes sence maybe carb or fuel problem. But would it not nose over or miss?
I,m asking this because I don't know. It never misses it's like being on a merry-go-round. 95


racer17j
Dirt Forum Champ
Total posts: 5390
posted May 15, 2005 07:57 PM  
I think 17j gets the brass ring on this one!

smallrock98
Dirt Forum Racer

Total posts: 100
posted May 16, 2005 04:55 PM  
carb needs rebuilt.

shifty8
Dirt Maniac

Total posts: 123
posted May 16, 2005 09:21 PM  
i had the same problem last year at the start of the season it was springs it went flat and i had a brand new carb so i was not thinking it would be that so i changed the springs. problem was fixed it did not pop at high revs like it should have if it was springs bit went from reving 5500 to 6300 just from changing them.

rpm9595
Dirt Roller

Total posts: 11
posted May 17, 2005 05:37 AM  
Thanks to all for your time and input. Keep ideals comming, I'LL let you I LET know the fix. IN ABOUT 2 WEEKS, GREAT FORUM. 95

dontmadder45
Dirt Newbie

Total posts: 3
posted May 25, 2005 07:41 PM  
Check needle seat for fuel cell foam.

mark46ew
Dirt Roller

Total posts: 24
posted May 26, 2005 04:20 AM  
95,If your running a stock distributor I would at least change the mod to a accell or something,A stock mod flattens out around 5500 rpm..

rpm9595
Dirt Roller

Total posts: 11
posted June 20, 2005 12:24 PM  
Bent pushrods replaced them it pulls all the way to the turns. Some were not bent bad but changed them and it RUNS.

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