Looper wont start

[Roddles]

Hi fellas.I got a 3L looper that i ran at the drags the other day.i had starter motor probs that caused the engine to crank slowly.Ithink I over primed the engine and it is completely flooded.I fixed the starter motor but i cannot seem to get the engine to fire. It has spark and fuel and the timing is right on.Could it be so flooded that it wont fire because i can see almost a pool of fuel inside no 6 plug hole with a bore light.If that is the case then how do I remove the fuel from the crankcase

[SlimDaddy]

You can pull all the plugs and crank it over a few times to expel all the excess fuel from the cylinders and I would pull the kill switch before I did this to ground out the ignition to prevent loading up the components and /or having a flash fire from all the excess fuel.Turn her over a few times , let it sit for a few, put the plugs back in,disengage the kill switch and she should fire unless you have trouble elsewhere. Just my .02.:cool:

[jphii]

And put new plugs in it too.

[Cobalti]

Ring up the dip stick who rebuilt it for you and tell him you want your money back!!!:eek: :eek: :D

[racer]

Make sure you check for spark with the plugs in as a little more crank speed with them out can make a difference in spark.

[Roddles]

AL it seems like as soon as all the plugs go in and the leads are on that the spark is almost cancelled.It seems to be cranking fairly fast with two batteries connected to try to get strong voltage.I am using a race fly wheel but it started easy enough the day before

[Roddles]

Orlando you are are naughty naughty boy.Get that bloody rotissary outboard going will ya?He he

[bigbore]

do the ignition output test,somewhere in the circut there's a problem (probably),you obviosly got gas,so it's gotta be ignition,unless the compression is weak (to the point of to much blow-by)that'd be in the viscinity of under 80-60pds.

[racer]

If when you install the plugs the spark does go away I would suspect the starter drawing to much amperage and experiencing a lose of crank speed. I would try another starter.

[Roddles]

gonna try another staarter.Once again thanx for the help everyone and always to the guru Mr Stoker

[bigbore]

you can re-build the starter,with a new armature n brushes,price out the internals as to a re-man,or just go new n replace.:cool:

[Roddles]

Well thanx for the help fellas.Found the problem to be the starter.Also gonna try using a battery with much more cranking amps than the previous as the gold fly wheel seems to need some serious cranking speed to excite spark

[HighVelocity]

Most people know this but it's worth repeating to those that don't.

The reason starter's take so much current is because the starter is like a dead short if you will. So to push past the short, and make it spin, you need a lot of power. If your cranking with lower current you are in essence slowly burning the starter up(Sizzle Sound). lol

Now if you couple this with a high compression motor you really need some cranking amps.

[j_martin]

As battery voltage goes down, starter current goes up. As starter slows down, back EMF goes down and current goes up further. Too much current is what converts starters to smoke. Don't skimp on the battery. It's much cheaper than starters.

John

[Roddles]

Yeah thanx fellas.Gonna definately buy new starter and high cranking amps battery.also think that part of the problem is because I moved the battery to all the way up the front of the boat however I used some big assed leads to make sure that the current loss was minimal.Noticed that the engine was needing to crank at about 600rpm to excite a spark from the race flywheel.Is this normal AL?

[racer]

Even on 24 volts they will not crank that fast, a good battery/starter on 12 is a little under 300 when I hook a meter direct to the flywheel, it takes 250 to generate spark.

[Roddles]

Tacho was showing 500 600 rpm at cranking speed AL.Is this incorrect?

[racer]

The tachs generally dont read correct until the engine is running

[Roddles]

ah ok thanx AL

[j_martin]

I used some big assed leads to make sure that the current loss was minimal

How big? 1 volt of drop at 12 volts is over 8%, which is over 15% loss of power after you figure in all the other chit that happens. (see my last post) 1 volt of drop at 120 volts is less than 1%.

4 gauge wire, 40 ft in length (20*2) will drop 3.5 volts at 300 Amps, over 1 volt at 100 amps. Any connectors add to the problem.
hope it helps
John

[woodduck]

Hey Roddles, wondered why that thing would not start! Don't you hate being towed by a jetski! Are you coming to the drags this sunday?

[Roddles]

yeah gonna be there but not racing cause Im video some boats.How about you?

[Guy Hanson]

I wont be dressed for it but will be running the little blue Leeway boat with the Twister on the back. Roddles can I take your boat? i would like to win!!!!:D

[woodduck]

Definately! Even tho as I type the trailer is on stands, wheels in corner of workshop, guards over there, beside boat which is on tyres, gearbox in other corner, powerhead is in back of ute and the mid is in pieces so yeah I will be there! Not looking forward to tommorrow! Got a new prop to try! Want to crack the ton, rather than the mid, again!