Holy horsepower!

[RIDE-RED 250r]

WOW! That's the first time I have seen or heard of such miserable failure with V-Force reeds! Not that I make any claim of knowing everything mind you....That is very disappointing though.

Oh, and Yamaha225dr, you can do plug chops to check your low speed (pilot) circuit as well. Same procedure, just get it good and up to temp on an old plug, then put a new one in and run it around for several minutes trying to keep it in that pilot jet range at all times.

Sometimes jetting can be confounding and seemingly defy logic. For example, my 250 with the Fatty pipe, dual stage reeds and PWK36 is currently at 160 main, with a 37 pilot...and it still seems like it wants 1 size leaner on the pilot! Take the jetting where your engine leads you.

[Jason125m]

I've been on the fence about a 38. I guess I will search around for a 38 and see if it is as good as everyone says it is.
Which 38 are you running Yamaha?

[RIDE-RED 250r]

I've been on the fence about a 38. I guess I will search around for a 38 and see if it is as good as everyone says it is.
Which 38 are you running Yamaha?

Absolutely! One of the best bolt-on mods you can do to an R in my opinion..... another plus is that carb is very capable on most of the big bores. Leaves you room to grow. I eventually want to get a 40.5 for my big bore to sort of "complete" my build theme. But for right now it really does run good with the 38 AS.

[yamaha225dr]

It's the 38pwk carburetor. I didn't do the pilot test exactly like you described, I just let the trike idle for a long time without touching the throttle and checked the plug after that and it got a little darker but not much.

[RIDE-RED 250r]

It's the 38pwk carburetor. I didn't do the pilot test exactly like you described, I just let the trike idle for a long time without touching the throttle and checked the plug after that and it got a little darker but not much.

Not much real difference between a 38PWK and 38PWK/AS. It's the same carb, just the AS has a couple little fins in the venturi between the slide and intake to supposedly guide the intake charge more effectively. From what I see here and other places, the jury is still out on if it really makes a difference or not....

Well, the pilot jet does have an effect on the idle circuit. But from what I have done, an idle test doesn't give the full picture of how you are running on the low side.

Like I said, just like a main jet WOT plug chop... Do the same thing, but keeping the throttle above off-idle yet below 1/4 throttle. That will give you a much better indication of how well your pilot jet is dialed in. You will notice that you have to run it around at that speed for several minutes though. Running that throttle range takes a bit longer to color the plug than doing a WOT main jet check....

While you are running it at that speed to get color on the plug, pay attention to how the engine is running. Listen carefully for smooth lean bogging if you lay into the throttle a little bit while running the engine on the low side.

My guesstimation is you will get a very dark and wet plug when you do a pilot jet plug chop....If you do, and you end up needing to step that pilot down a bit, you are going to notice even better transition up through the low end if/when you make an adjustment!

Make sure and post up your findings!

[yamaha225dr]

Thanks! I will post my findings but it won't be until this weekend.

[yamaha225dr]

Well, I finally got around to tinkering with my jetting again. I dropped the 55 pilot down to a 48 and it's a tad too small, so I am gonna try a 50 next when I get time. I can't tune out a hanging idle with the 48 and it's lost a decent amount of power on the bottom end.

[RIDE-RED 250r]

OK good, sounds like you are making progress...

Hanging idle can be indicative of too lean of a pilot jet as you suspect IF you have conducted a leak down test and are 100% sure you don't have an air leak somewhere.

So long as you have no air leaks, you are certainly on the right track!

[yamaha225dr]

I have sprayed carb cleaner around the boots and carb and everything is fine. I have noticed that my float height is a little too high, cause it is slowly dripping out of the overflow line. It's really a tiny amount that only made a puddle about the size of a quarter on the concrete over a two day period. I guess I never noticed it before cause I usually drain my gas after every ride. I know my float is not sticking cause I clean the carb every time I take it apart.

[yamaha225dr]

So, I have the pilot at a 50 and bumped the main to a 162,this required me to drop the needle one notch but it's running great! my reasoning on the main jet change is that I am moving next month and the elevation is gonna drop 1,000ft and the type of riding will be more wide open then I am doing now.

[yamaha225dr]

Some day, I will get a go-pro but for now, the good old cell phone will have to do. I wasn't planning on dusting my phone but it was either that or run it over. lol

https://www.youtube.com/watch?v=xuFM2erOm-o&feature=youtube_gdata_player

[barnett468]

Hello yamaha225dr

I have noticed that my float height is a little too high, cause it is slowly dripping out of the overflow line. It's really a tiny amount that only made a puddle about the size of a quarter on the concrete over a two day period. I guess I never noticed it before cause I usually drain my gas after every ride. I know my float is not sticking cause I clean the carb every time I take it apart.

One should always adjust the float level first because it affects the jetting. If you jet first then adjust the float the jetting will change. High float is richer, low float is leaner.


TRUE GAS LEVEL TEST -

1. Take a 12" piece of clear tubing and connect it to the bowl drain fitting

2. Hold hose close to carb with open end even with carb top.

3. Turn gas on

4. Open bowl drain screw.

5. Gas will fill tube to level of gas in bowl.

6. Level should be from even with bottom edge of carb wgere it meets bowl to 3/16" below bottom of carb.

[barnett468]

Hello


Spelling correction, "wgere" should be "where".

I have no edit button.

[yamaha225dr]

it wasn't my float level, the o-ring on the main jet access bolt was worn out letting gas seep through.

[RIDE-RED 250r]

Looking at the vid it sounds like you certainly have no loss of power down low!