Good advise...we run the 56er at those rpm's all day long as well, just with a different gear ratio and pitch that's all.Quote:
Originally Posted by ima75man
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Good advise...we run the 56er at those rpm's all day long as well, just with a different gear ratio and pitch that's all.Quote:
Originally Posted by ima75man
i will have to give this a try with small pitch prop.
once i know what it will do, then i can try to get the 13 3/4x23 srx to something close to it.
ima75man do the 70 carbs make a huge difference in the rpm ?
my goal is to get this boat in the high 40's . to get 50mph would be terrific, but 45 plus i think is best to realistically look for with this boat..
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check out a 70 h/p carb off a 56 inch.
I am on ebay every day looking for a set of 70 carbs for this engine.
2 sets have been on there in the last 7 months, both sets turned out to be same 60hp as mine.
they seem to be rare over here for some strange reason !!!!!!!!!!
only one that are available are very old type with old style choke.
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you will get them I have bought several in the last year or 2
with the 70 carb's is it a case of just larger venture and butterfly ?
if so could I get these spare ones reamed out and make up new butterfly disc's.
or is there other stuff deep inside the carbs that's also different ?
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what year did the 70 carbs come out that would fit straight onto my engine ?
mine is 1995 56 cu in with the quick start choke to the inlet manifold, don't realy want to change onto old choke type.
is there any other engines that use these carbs ? like a twin or bigger that still uses the same part numbers etc, as there just is not any of these around.
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you wont find the same part number as a jet change will change the assembly part and bodies are not sold separately.
The first year of the 56 was a 70 so they have the larger carbs.
Those 1 1/2 carbs are also on the 60hp 2 cylinder and later propshaft rated 50.
There are various designs of the carbs so if you dont get the same type ( as the 56-70) as in all fuel jet or 1 fuel and 2 air jet etc you will be on your own re jetting.
just as I thought
I need to stick to 1993 0nwards carbs from a 70hp.
is there anything at all else that is different from the 60 to 70 ? I have looked on a parts list and I cant find anything other than a carb change to make this a 70 (apart from the decals).
such a shame its not just a jet size , as that would be dead easy to get swapped out.
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have you checked with a BRP dealer that your engine doesnt need the changes that there was to jetting and the tell tale location
There is a service bulletin for it.
If you have access to good fuel I would be shaving a bit off the head and or blocking the idle exhaust relief's as well if you have a light boat and you dont overload the engine...plenty of variables in that...