98 Johnson Venom 200

[daselbee]

Re: 98 Johnson Venom 200

I mean timing, adjusted propperly as you open throttle, it advances also from say 6-8? idling to 18 or 25? WOT. .

Not sure what you are trying to say here, but the timing spec of 18* at WOT for a 1998 200 looper should not be exceeded.
The engine will begin to ping, detonate, and eventually burn a piston.
That is exactly what the WOT timing stop IS FOR...TO KEEP THE WOT TIMING VALUE FIXED...

On a very related note, other engines...from memory, the crossflows, do require the WOT timing spec to be at 24* (again, from memory).

So it depends on the engine, but I would never exceed the spec. You can back them off a couple of degrees without hurting anything, say for break in period or such....

 

[mekkamaz]

Re: 98 Johnson Venom 200

I agree about timing to specs, maybe motor has its decal and it show correct timing on it, but also question about why it was at 25? and was working that way....also right about the rattle and hum of a timing, but, again, maybe (just maybe) the before-shop timing was right, accordingly to its timing mark in the flywheel...also if it really hits 5k.....but if it is hesitating it maybe be retarded.....a little test advancing it, will not hurt, and if it stop hesitating and feels lighter, there you go! always if it does not rattle or ping.....but in our friend best interest, if you all think this is out of line, well, please cbaker10, disregard my comment!!! this is my humble opinion based on my experience only...Cheers guys!!!

 

[cbaker10]

Re: 98 Johnson Venom 200

Again, I appreciate all the replies. My question now is; could the advanced timing be hiding some underlying problem, perhaps in the heads or something major like that? Because the motor was running fine with no hesitation, just had issues idling and a very slight miss. I get the carbs cleaned and synced and put plugs in it, set timing to specs, and now it want idle at all. I'm really starting to wonder if it is something in the cylinders now. My compression is also jumping around some now, using the same gauge as before. Some hit at 90, one hits at 120, and a couple at 105. Seems kind of spread out to me. It just seems funny to me that I got a good compression reading and now they are jumping all over the place. Maybe it's time to pull the heads and see whats going on? What do you all think?
Thanks

 

[daselbee]

Re: 98 Johnson Venom 200

I think you have mix of an iffy mechanic, the uncertainty of marginal tools, and an unclear knowledge of the workings of the engine.

Leads you to bounce all over the place when trying to diagnose.

Do not remove heads yet. Those head gaskets are about 45 bucks each.....
Get another comp gauge, make sure you are screwing it in all the way to the o-ring, re-do the comp test.
Note teh readings. Spray a mist of TCW-3 in each plug hole, turn the engine over briefly, and then re-do the comp test. Record the readings. See if the oiled cylinders improved the comp.

If, after you are sure you can get repeatable readings for all six, and a cyl or cyls are low, then maybe you could take the head off to examine the bores. BUT THIS IS A LAST STEP in my opinion, at this point.

Your mechanic can adjust til the cows come home and never get it right with ignition voltages as you posted above. Fix that first.

Where are you anyway? Close to FL?

 

[clanton]

Re: 98 Johnson Venom 200

You using a peak reading meter?

Check stator output.
Check pack output to coil, 4 cylinders normal, 2 low = bad powerpack.
Engine has Quick Start, you need to know about this to set timing, or you will be off by 6 degrees.
Magnets in flywheel OK ?
Upper main bearing bolts tight?
Fuel pressure?
Float settings in carbuator ?
Compression guage probley needs the check valve replaced, to get good reading.
have specs if you need them, book not handy this morning.

 

[cbaker10]

Re: 98 Johnson Venom 200

What else could be causing low voltage, we swapped coils and the low voltage did not follow
the coils. He also did a bunch of checks on the powerpac and
said everything is within specs. Where would you look now?
And no, I'm all the way in Kentucky.

 

[Faztbullet]

Re: 98 Johnson Venom 200

The 2 cylinders with low voltage, are they firing coils? On the trailer ,running in gear at lake pull those 2 wires one at a time and see if cylinder drops,if it does its ok. I would go back and look at carb repairs as if gaskets,o-rings and covers are leaking you will have idle problems. Is the roller on the throttle arm in good shape or has outer coverng broken off?

 

[Dr Bass]

Re: 98 Johnson Venom 200

Ive got a 96 norriscraft 1900 XLVEE with a 97 venom 200 that will fly! "when SHE wants to" lol that damn motor has given me more fits than any other ive owned! well let me be clear i havent had any major probs with it just lil stuff like your having,it never wants to crank when its cold,i have to break out the starting fluid and give her a lil shot. i know i know its bad for it! But ive tried EVERYTHING and nothing has fixed that lil issue so what i do is before i leave i hook up the ears and crank her then head out after she warms up and after shes warm shes fine! She will fire right up with a bump of the switch and will crank all day but after about 24hrs she wont crank until i spray her with a lil starting fluid. The whole sneezeing thing your talking about really cracked me up! Cause i sooo know what your talking about!! Mine does it too! Its like it hicups right before it dies when idleing. Anyhow im DONE working on it!! Ive damn near lost my mind trying to get her just right! Ive just excepted the fact shes a moody little **** that runs strong when she wants to and will cough choke and run like ***** if she wants to lol but i can say for the most part shes a good lil motor that runs good 95% of the time! lol i thinl alot of my problems have to do with mixing my gas and oil just right if i dont mix it perfect the way she likes it then shes gonna not idle right and be a pain in the ***** to crank! Ive also noticed she runs like hell on rainy days and runs like a raped ape on on cold clear days.. Anyhow good luck to you

 

[mekkamaz]

Re: 98 Johnson Venom 200

If you have spark an all 6 cyl, I look at the carbs first....as your mech moved all the linkages, check if there?s no adjustment failure there..it?s worth checking again what has been done. I agree, calm down, I don?t think you have a serious compression issue as you said it was working fine, just a little miss.....oh boy! I have been in your place! Since then, I bought my manual an do things myself...with the great great help from this awesome forum, of course!!!!!