Hanging rev 250r air cooled passed leak down test

[knipfeldustin]

You guys maybe correct about it looking lean I was told this was the color I was looking for but that's just someone's opinion .....anyone with pics of a properly jetted r plug ? We also tested my friends 2nd gen 300 and his plug was almost identical in color but the ring was wider (almost double) does the ring size on the plug tell you anything ?

[El Camexican]

Mixing octanes works just fine. How'd I do El?

I’m not much of a beer guy, so when mixing octanes other than Pemex verde con roja I prefer to mix the two liquids shown and ignite them with one of these fat boys. Must suck to live under a regime that hates Fidel Castro so much they won’t let you enjoy two of life’s greatest pleasures.

[El Camexican]

You guys maybe correct about it looking lean I was told this was the color I was looking for but that's just someone's opinion .....anyone with pics of a properly jetted r plug ? We also tested my friends 2nd gen 300 and his plug was almost identical in color but the ring was wider (almost double) does the ring size on the plug tell you anything ?

Forget the black around the rim, or any deposits, that comes with prolonged use. The light brown/tan on the plug on the right is a nice safe color. That guy might even be able to go down another size if he was racing for a living, but for me that is what I want my plug to look like when I finish a long trail ride.

[DohcBikes]

Post #49 for a lean bike. Jetting was changed, it now revs, plug looks lean etc....etc.....etc.....

Can we get some tuning changes in the mix here lol....something! I'm patiently (OK no that's out the window) waiting to see what going back to the original or *GASP* even richer jetting than you had will accomplish......

[barnett468]

Howdy!



Post 50...do we win a prize?

Billy Joe Billy Bob is a little sauced right now so he asked if I could help out.

I was thinking new carb because I have also leak tested the intake boot while running with starting fluid and no change in rpm. This leads me to believe if it is an air issue it has to be carb related.

Based on your comments, it’s NOT the carb, no way, no how…NOPE. Based on your PLUG photo, the ONLY thing wrong with your carb, is the MAIN JET that is obviously too small.

Your carb is not getting hot at wot thereby causing it to get a temporary air leak that goes away after the engine cools slightly. You are missing the point, you should be able to hold the throttle WIDE OPEN then pull your ignition and it should STOP RUNNING unless something in the cylinder was hot enough to ignite the gas as I and around 50 other people have mentioned.
Like I said…if you want a new carb, buy one. It ain’t gonna fix your problem though but it will look awful pretty.

This is plug from the 370 jet test. Attachment 193654

Hey…that color looks perfect….for my Lexus… Go up as I and around 50 others suggested. 2 sizes max.

If it gets too rich, it will burble/sputter. This is when you can say it “runs like a dog”. It’s common to go down around 1 -2 sizes from the rich/sputtering point.

In other words, if you were to put like a 420 in it, it will gesticulate at high rpm’s for sure. Then you try a 410, 400, 390 etc., until the gesticulation is gone, then go down 1 minimum or 2 maximum from that point. This way you know you are not too lean for that elevation and air temp etc.. Jetting typically must be changed slightly based on varying conditions.

I hadn't thought of or heard of the tranny fluid burning ? Is this common ?

You are not burning tranny fluid. Anyone that reads all the posts knows that because you did two leak down tests with no leaks.

Gonna ask a question more than offer any help. But is oil gas mixture any way relative to WOT runs vs say mid to low range?

Scientific testing shows that as the rpm increases, the oil “migrates” through the engine faster. This means that 20:1 “acts” leaner at say 6000 rpm than it does at say 2000 rpm. Yes I know it makes no bleepin sense because it is still 20:1, however, in simple terms, this is what it does. This is why racers that run at high rpm all the time use more oil in their mix than a trail bike would.

hoping you can get'er figured out sooner rather than later and we can all learn a little bit and you can get back on the track with it(and show up some Kawi guys! lol) Good luck, Don

Yeah..."Good luck" is right cause yer gonna need it along with a boatload more horsepower if you think you're gonna beat this thing.






Or even this, and it's completely stock!
The KAWASAKI TECATE...The fastest production 3 wheeler in the universe.




You sir, have been served! ! !




Holy cr_p…I gonna die laughin. People simply shouldn’t drink before they post. Ahhhh, ha, ha…

[El Camexican]

Gonna ask a question more than offer any help. But is oil gas mixture any way relative to WOT runs vs say mid to low range? As I said don't know that much but curios if possible. Thanks

Only that you need to use more oil if WOT is where you ride all of the time like say a road race bike VS a low speed trail rider. In theory adding more oil to each gallon of gas leans your engine out as the oil displaces fuel, but it is a negligible difference unless you were say jetted perfectly at 8,000’ of altitude using a 100 to 1 oil ratio and then one day you trailer your ride down to sea level and started running a 16 to 1 oil ratio with no other changes, but this particular problem has nothing to do with oil ratio or brand.

[knipfeldustin]

I don't ask you to keep posting the same over and over that's your choice bud. I'm simply having conversations with more than one person here who all suggest different things. I believe I stated I would try jetting it up today it's now 8 am ............................whole lot of day left .......since the color ring on my plug is lean you say what color am I looking for ? Like I asked before does the size of the color ring mean anything?

[sick85crownvic]

Don do u offer porting or just the polishing service ?

I really only do porting for local guys, so I can match the slope of the feed ramps to the transfer ports and make sure everything is good...but I'll polish stuff for anybody! lol

[DohcBikes]

I don't ask you to keep posting the same over and over that's your choice bud.

Hmmmmmm.....are you sure?

does the ring size on the plug tell you anything ?

Forget the black around the rim, or any deposits, that comes with prolonged use.

.....anyone with pics of a properly jetted r plug ?

.......since the color ring on my plug is lean you say what color am I looking for ?

Like I asked before

does the size of the color ring mean anything?

This is huge discussion for a simple issue. There are several very knowledgeable people attempting to tell you to start making changes, because your bike is most likely running lean.

Talking about the specific gravity of a fuel molecule isnt gonna tune this bike.

Maybe if you hadnt started several threads complaining about how the site functions, people would be a touch more receptive.

On the other hand, you have an engineer, more than 2 bike technicians, and El Camexican (if you dont know then ya better get some schoolin) telling you how to start tuning the bike, but it seems that you are attemting to instead DISCUSS tuning the bike, or possibly even just allowing us to be in the presence of your knowledge.

Hopefully you arent the sensitive type, theres a lot of that going around.

Still looking forward to some results. Even if we are ALL wrong and its not the main jet you changed, then at least we have somewhere to go from there.

[barnett468]

Howdy!

I asked before does the size of the color ring mean anything?

Well one thing it means is that your plug only has a few minutes on it and the ring will simply grow a little larger and get progressively lighter toward the tip. That might sound confusing but I wouldn't concern myself with it because I do it a slightly different way.

since the color ring on my plug is lean you say what color am I looking for ?

El Camexican posted a photo of plug colors in post 48. I am saying the upper part of the porcelain looks lean. The top of your porcelain will get a little darker after a few more hours, however, I and others can tell where it’s heading. A more accurate readings can be achieved after a minimum of around 20 minutes of slow and wot riding. I occasionally like to finish up after 30 minutes with a wot plug chop. Others do it differently.

After looking at over 100 plug photos, this is the best example I found. Imo, your plug should look very similar to the one on the right left after around 15 minutes of riding. After a few hours or more it should look like the one in the left or just a hair darker imo. After many days or more, it will likely look more like the one in El Camexicans photo.

I have personally only seen one plug with the threads chopped off. We did not do this in R and D and Racing dept never did this and Kawi has won a zillion races and a zillion Championships.


My point is, after you ride it slow and wot for around 30 minutes, I would want it to look darker than the one on the right. If it looks a hair darker than the one on the left after a few hours it is fine imo. if it looks noticeably darker, it is rich. The other point is, if your jetting was WAY off, I would expect you would hear some detonation/pinging or notice some performance problems like flat spots or burbling under acceleration etc., but you haven't mentioned anything other than "dogginess" which is a bit hard for some of us to interpret. .




OMG…The pig is talkin again!

[DohcBikes]

Imo, your plug should look very similar to the one on the right left after around 15 minutes of riding. After many days or more, it will likely look more like the one in El Camexicans photo.

I have personally only seen one plug with the threads chopped off. We did not do this in R and D and Racing dept never did this and Kawi has won a zillion races and a zillion Championships.

but you haven't mentioned anything other than "dogginess" which is a bit hard for some of us to interpret. .

OMG…

[barnett468]

.
Howdy!




Sorry...wrong photo. The one on the right is lean, the one on the left is ideal.




OMG...

[knipfeldustin]

Like I said I appreciate the info and I have performed some of the tests you have suggested. As for the site sure i think it's ridiculous to post ten times after having been a member for almost three years common sense would tell you its not a spammer acct I had legit posts on my 350x .... I'm welcome to my opinion as much as you are yours. I was taught to jet this way I'm not pretending to say its right just how I was shown. As for the fuel issue no I'm not going to agree with your info, again you all are welcome to your opinion ill stick with what I know on this issue no reason to be upset because your opinion doesn't agree with mine if you don't like being called out for something you said that could "gasp" possibly be incorrect or is different then I'm sorry I can't help you there. This isn't a pissing contest so stop trying to turn it into one.

As for the tips provided I am working my way through them. I went up two jet sizes this morning and the issue remains this time as soon as I got to wot and tried to come back down it did it. I performed the starting fluid test to The intake boot while idling before this with no leaks. I appreciate the pics that helps. I'm going to relearn this plug stuff if my way is incorrect because I was taught if you don't chop the plug then you don't know what it's telling you and it's the only way I've done this in the past it has worked until now but if its incorrect ill try it your way .... I can't really ride it for 30min because after a few at wot its death revving. The bike ran about the same with the 390 jet as it did the 370 sputtered in the low end a bit about quarter throttle but cleaned up about half throttle in first and second. That is the biggest main jet I have currently...

After thought ....the bike didnt run long enough to get overheated before it occured this time as I didn't even have 5 min on it before the rev

It's a 45 min drive for me to get race fuel so ill test that out when I am going in that direction to pick some up.

I inspected the carb slide and it appears in good working condition without excessive wear.

My throttle cable is free and not frayed, I sprayed some lubricant inside it anyways to cover that issue.

I watched that my fuel filter stayed full of fuel while riding this morning and the line is new so flow is not an issue.

So as of now the trike has performed the same rev with a 370, a 380, (which is what was in it when I bought) and a 390 main jet.

I do not hear any pinging noises. honestly this is one of the quietest smoothest sounding air cooled motors I have ever listened too. I am not an expert obviously but have grown up on these.

I will continue to work on suggested tests and post back results as completed.

Again thanks for your help.

[knipfeldustin]

Slide pics

[knipfeldustin]

This side shows some brass at the top of slide but doesn't continue the length of slide