This one will get you thinking

[trent750]

I have a 1996 50hp triple, idles good, between 1000 to 1700 rpm it falls appart, after that it runs great. I have had the carbs cleaned and set. Had the timing and sync procedures completed, all were set and needed no adjustment. Tried both types of plugs listed for this motor. The VRO was removed but this problem was before that happened. I also removed and cleaned all terminales that I could get to. Any advice would be greatly appreciated.

 

[bktheking]

Re: This one will get you thinking

When they or you??? cleaned the carbs were all the orifices removed and confirmed to be correct for the carbs?

 

[jonesg]

Re: This one will get you thinking

Its the carbs.!

 

[kenmyfam]

Re: This one will get you thinking

I'm with the "It's the Carb's" group.
Make sure those plugs are Champions !!!

 

[Dhadley]

Re: This one will get you thinking

Describe what you mean by it "falls apart". Is it missing, bogging, struggling to get on plane or what? Kinda impossible to say what the cause is until we know what the problem is....

 

[trent750]

Re: This one will get you thinking

The carb were cleaned at a dealer and they did some ultra sonic cleaning. As if the orficices are the right ones, I'm not sure but they all have the same numbers on them. By falling apart, I mean, it drops a cylinder and picks it up intermiditly. Give it just alittle bit more throttle and it all cleans up and smooth as can be till wot.

 

[bktheking]

Re: This one will get you thinking

Well if you didn't do the work we need to verify the orifice #'s, they might have put the wrong one's in the wrong spot, people make mistakes. You may have a little dirt in "one" orifice cutting fuel during mid range.

 

[Bifflefan]

Re: This one will get you thinking

Had the timing and sync procedures completed, all were set and needed no adjustment.

Sound like you have all the answers.

 

[trent750]

Re: This one will get you thinking

Let me rephrase that, I Paid to have the carbs cleaned and some ultra sonic cleaning. This morning I took the carbs apart thinking it was the intermidiate circuit except the long tube that goes to the bowl. All I could do was shoot cleaner thru them and see it come out of the bottom. That tube is surrounded by a larger tube in the bowl. The intermidiate jets all had an "OD" on them. Not sure if they are the right ones but they all match. Is there a way to remove the large tube, I see it has slots like for a screw driver but I didn't want to turn them. Thanks for all the help, I can't afford to send it to a dealer again without it fixing the problem again.

 

[trent750]

Re: This one will get you thinking

As far as ith timing and sync procedures, I have a seloc book for the motor and I performed those myself. I wasn't really expecting them to be the problem but I had to rule them out.

 

[bktheking]

Re: This one will get you thinking

There are 2 orifices in the carb, 1 in the bowl and one at the top. The top one should be number 40D which is your intermediate , did you remove it when it was cleaned. Still think it`s carb related.

 

[trent750]

Re: This one will get you thinking

Yes I removed both of those orfices and they were clean. I was looking in other places and came across an article about the emulsion tube leaking, Does this sound like a reasonable problem.

 

[bktheking]

Re: This one will get you thinking

I have yet to run into one with a bad emulsion tube but I have seen cracked ones, a gent posted a pic of a cracked one a month ago. Unfortunatly if it were that the tube is part of the carb body and would require a replacement carb. Are the carb tops plastic on those carbs? If so are they all in good shape, no cracks or warpage?

 

[trent750]

Re: This one will get you thinking

Yeah they are plastic but look like new. In the article they said the tube would leak between the tube and the body, They also said to seal it with a oem sealer. I was looking thru the book I have and it doesn't say how to set when the timing starts to advance (like adjusting the throttle link) My thought was maybe the timing wasn't advancing soon enough when throttling up. Do you know how or where I can find info on how to set the throttle link?

 

[bktheking]

Re: This one will get you thinking

Seloc manual, may as well use it to start your next campfire, they are worth about that. The OMC manual is what you need, I don't have one for that motor, too new. Thinking logically here, if it Idles great and will run full power, why would the timing be out, if timing were out it would have an effect throughout the power range. Back to the carbs, where they sealed with sealer, could be that it's pulling air at midrange.

 

[trent750]

Re: This one will get you thinking

I don't have any sealer but was going to get some tomorrow, I figure what could it hurt. My thoughts with the timing was that the idle timing stop was set at 8 atdc and the wot was set. The carb get alittle throttle before the timing advances which I thought would put it behind and more of a problem at lower rpms. Once the rpms got up there it would be less noticeable, I'm talking about a degree or two. That was just my thoughts. I've got my carbs on the table next to me and I went thru them again with nothing found, I think I will try to seal them tubes tomorrow just incase. I'm really stumped with this problem.

 

[bktheking]

Re: This one will get you thinking

Compression readings good across all 3 bangers?

 

[trent750]

Re: This one will get you thinking

Yeah I checked them about a month ago, don't qoute me on this but I think they were all 24 psi

 

[trent750]

Re: This one will get you thinking

or maybe it was 124psi I can't remember but they were all consistant.

 

[bktheking]

Re: This one will get you thinking

124 makes sense, 24 and there's your problem I don't know the timing setup for that motor and there isn't much info using google about the triples. Maybe Faztbullet or Dhadley could shed some light on timing, try pm'ing them the thread to ask for opinion on timing.