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Re: Low Power with any incline in 5th/6th [Re: NewRiderXT] #146061 09/19/19 07:04 PM
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#brer15 Offline
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Originally Posted By: NewRiderXT


Not sure what that means in terms of the issue, but colder air = more dense,
That is correct. More dense air = more oxygen. A carb adjusted perfect in the summer will be a tad lean in the winter with no adjustments. Some guys back their pilot screw out 1/4 turn the winter. I don't think you had a big enough swing in temps to make a difference.

Could your air filter be over oiled?

I tend to think it is the aftermarket carb. Maybe you should work on getting the factory carb back up to par. Just a thought.

Last edited by #brer15; 09/19/19 07:05 PM.

2004 XT225 purchased new in October 2004 0 miles. Current miles over 27,000.
Re: Low Power with any incline in 5th/6th [Re: NewRiderXT] #146062 09/19/19 11:31 PM
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peejman Offline
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Yep, 60 up a slight hill isn't bad. 70-75 top speed is all tucked in as tight as I can get. Mine will pull 55 up a hill much better than at 45.

Mine definitely feels a little peppier on those cool mornings. I have a UNI filter too, and it's hard to over oil one. The foam isn't as dense as the OE filter and it would drain any excess into the bottom of the airbox pretty readily.


This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
Re: Low Power with any incline in 5th/6th [Re: NewRiderXT] #146068 09/22/19 03:39 AM
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Holy Cow, I now realize was not really getting anywhere near redline with the poorly made Chikuni carb that I had on there!

100% was issues with the carb. I finally got fed up enough to swap the old carb back in, stuck pilot jet of unkown size and all. I had cleaned it out previously, but other than that I didn't do anything to it.

Took it out and just plain WOW, steady pull till she screams and I wasn't even maxing it out. I haven't hit a highway yet, so no idae what the top speed is now, but hit 65 without even trying hard.

Previously I was hitting WOT with 5th and couldn't get past 50-55, shifting to 6th would then net me another 5 mph or so, again pegging WOT the entire time. I cannot wait to she what she can do on a more open road, entirely different feel.

My only complaint now it that I have alot more popping happening on no throttle engine braking. I believe I adjusted the mixture screw 3 turns, but I really don't I'm hoping proper adjustment will at least reduce that. I also had a couple stalls while braking with clutch to a stop, might be just the idle speed adjustment. Wanted to get out and do a quick test drive before I got to into the tuning bits.

Now I just have to replace all the hoses that have been long gone. And the pilot jet issue may stay just the way it is, I'm a bit more scared to try and remove it now that it is running so much better. If the mixture adjustment screw doesn't fix my popping, the next higher pilot (Assuming whats in there now is stock 40, would be 42.5, which I have...).

The hose barb on #15 in the fische:

https://www.partzilla.com/catalog/yamaha/motorcycle/1996/serow-xt225h/carburetor

is also broken off, not sure if this is a vent/breather/overflow. Also not sure how I can jerry rig a hose connection with it snapped off. It the one with the plastic cyliner with the rightangle barb connector. Perhaps I could get a small threaded barb or something to thread into the existing plastic...? There is rust in one of the overflow tubes already, from not having a hose connected, so I probaly should work on getting everything closer to the way it is supposed to be.


I had been seriously thinking that maybe I needed a bigger displcaement bike, to make commuting more manageable, but with this new performance I don't think that is the case anymore! Even on 55mph highways, it was so sketchy with that Chikuni carb and the lack of power on the inclines. I guess there is a reason they go for $50-60 vs $300-600+

Thank you everyone for the input, especially #brer15 for pushing me to try the old carb!

Re: Low Power with any incline in 5th/6th [Re: NewRiderXT] #146072 09/22/19 09:32 PM
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peejman Offline
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The popping likely isn't the mixture screw. There's a coasting enrichment circuit under the plastic cover on the right side of the carb. You'll get stalling and popping if this cover is cracked or the circuit is clogged. Check for a vacuum leak in that area.

That hose barb is just a vent. The hose runs down with the carb bowl overflow hose, or to the charcoal canister on a CA model bike.


This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
Re: Low Power with any incline in 5th/6th [Re: NewRiderXT] #146076 09/23/19 06:39 PM
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Muniac Offline
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A stock carb (unless really abused) should be rebuild-able and perform like new. Someone is now making the plastic coaster enrichment system covers too. I think peejman and a few others put a link to sources in a post I made bitching about it not being available.

One of our bikes had a significant leak given a crack in the plastic cover. In our case, the bike wouldn't idle as too much air was being sucked in thinning out the mixture. If just what's under the cover is clogged, you'll get different symptoms. As a matter or course, I'd replace the cover as part of a general carb rebuilding effort. Berryman's B-12 is good carb cleaner.

It's also a good idea to check all rubber parts given our ethanol laced fuel which is tough on rubber. Good luck restoring performance!


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Re: Low Power with any incline in 5th/6th [Re: NewRiderXT] #146084 09/24/19 01:02 AM
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Is there a good brand for a rebuild kit, I'm feeling s bit leery of the Amazon specials now, what with how that Carb performed.

I see All Balls sells some kits, and others that are 3 or 4 time cheaper listed.

I took a closer look at my plastic cover and no cracks or clogs, but the top plastic cover seemed to have a small gap. The orings are all pretty stiff, but I figure I can use the parts from the China carb to rebuild it, assuming the build quality of the other part are passable (fingers crossed).

The mixture screw is pretty loose on the original, how easy is it supposed to be to turn. It's loose enough that I'm afraid the vibration could be adjusting it mid ride.

Re: Low Power with any incline in 5th/6th [Re: NewRiderXT] #146085 09/24/19 05:51 AM
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Paul49 Offline
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Buy cheap...

Git thi pocket dipped lad, do it proper.


1958 Ariel 650 FH, 2014 Tiger Sport1050, 1995 XT225 Serow, Tiger 800 XRx.
Re: Low Power with any incline in 5th/6th [Re: NewRiderXT] #146086 09/24/19 08:19 AM
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#brer15 Offline
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Originally Posted By: NewRiderXT


The mixture screw is pretty loose on the original, how easy is it supposed to be to turn. It's loose enough that I'm afraid the vibration could be adjusting it mid ride.
Is it possible the spring is missing?

I used the All Balls rebuild kit. I replaced all the parts except the jets. I have no reason to think that the jets aren't good in the kit, just that my original looked to be in great shape. Everything worked good including the pilot screw and new pilot screw spring.




I replaced the coasting enrichment valve/cover with an OEM Mikuni.

Last edited by #brer15; 09/24/19 08:22 AM.

2004 XT225 purchased new in October 2004 0 miles. Current miles over 27,000.
Re: Low Power with any incline in 5th/6th [Re: NewRiderXT] #146087 09/24/19 03:02 PM
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peejman Offline
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I'd tend to agree. Those cheap kits may come with crap o-rings that will degrade really fast and you'll be back in the same position next year.


This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
Re: Low Power with any incline in 5th/6th [Re: NewRiderXT] #146089 09/24/19 03:30 PM
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Muniac Offline
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China is notorious for inferior rubber, plastic and steel. Best to go with OEM parts. You may want to query SUDCO on carb parts. Perhaps they can help. Good luck.


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