TRX250R.ORG
Workshop => Carburetor, Intake, and Exhaust => Topic started by: coops86250r on January 20, 2019, 08:31:37 AM
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Hello all,
I have a 86' 250r that is needed some attention. I purchased it last year in very decent bone stock condition from the second owner........ still had the original tires on it lol. I'm currently going through it making sure everything is good to go for this coming summer. I pulled the carb to give it a good cleaning and just see were things were at on the inside. What I found was a 30+ year old carb with some seriously worn out parts, i.e. slide and pretty much the rest of the internals were just gunked up. I'm at a point of do I repair/redo the stock carb or use the new PWK 35 I have sitting here already from another quad? With the exception of the motor having a new stock cylinder and piston, the motor is bone stock. First question is this....... since I already have a new PWK 35 sitting here will this be a decent carb to put on an otherwise stock motor? I've read that a lot of folks seem to really like the 38mm air strykers but if the 35 I already have will work well for what I have it seems like the best choice for now.
Next question that goes right in line with using the 35 PWK is will it work with an aftermarket pipe? Not sure what pipe, that would be the second prong to my questions here.........what would be a good all around pipe for this motor that would work well with the 35 PWK if that is the carb I stick with? I ride mostly trails and some non-competitive mx track time. I'm not looking for huge gains, just something that will wake up an otherwise stock motor when it comes to pipe selection.
Next question, if going with the 35 PWK, will it work with the stock intake boot or would I need to get a different size one. Lastly, what would be a good starting point for jets using the PWK carb? I know pipe selection will play a factor in this so if you give a pipe recommendation knowing what jet would get me in the ball park would be great.
I apologize for the long post but wanted to provide as much detail as needed.
Thanks for any help you may be able to provide.
Tony
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Hi Tony, the 35 will work as a replacement...works out since you already have it. The stock boot works also (works with larger carbs also). As far as pipes...I’d look for a used FMF.
Joe
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Welcome to .org...... I 2nd what Joe says on the pipe & carb. I have an FMF gold series Don Emler h-14 pipe on an unported 88 cylinder & love the power delivery it has. Your 35PWK will work just fine with pretty much any pipe & it will be an upgrade from the stock 34PJ. For baseline main jetting start in the low 170 range & a 48 or 50 pilot.
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Folks,
Thanks for the replies to the topic, I know it was a long winded post lol. That's great news with the 35 PWK working as a replacement. I figured the stocker is a 34 so going to the 35 shouldn't be to big of a jump on an otherwise stock motor. Glad to get the confirmation from you folks here! With the pipe selection, that is something that is totally up in the air. The big thing I'm looking for is something that works well on an unported stock bore motor. That's two votes already for the FMF which is good to know. I DO need to have a forestry approved spark arrestor, probably should have mentioned that from the get go.
Broken1, I appreciate the starting point suggestions for the jetting, this will hopefully save me a good bit of time versus buying a ton of jets right out of the gate. I'm in Iowa so I'm not in the mountains but also not at sea level either.
If anyone has other suggestions for pipes and silencers don't hesitate to chime in, selection can be good and also a curse lol.
I still have the stock reeds on the motor as well so I may look into an upgrade with those as well........suggestions there lol? Just looking for external bolt-on stuff to do to wake it up a little. A full motor build will happen down the road but getting what I can with relatively simple upgrades is the path I'm going at this time.
Thanks again for the replies folks!
Tony
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How does the Pro Circuit Platinum pipe and silencer combo compare to the FMF Fatty? The Pro Circuits I have on my Banshee are stout and really out perform the FMF in comparison.
Thanks for the input folks,
Tony
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Stock reeds as in steel reeds?.... Some guys like the vf3 reed cages, or the vf2's if you can find them. I have rad valves on both mine & like those. If your on a budget & still have an OEM reed cage you can get boyesen power reeds pretty cheap & they'll work much better than the stock steel petals.
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I have road both pro circuit and FMF. I prefer the FMF. The pro circuit was just tame. It had a slight hit low to mid. Then just a long easy pull. Kinda boring to ride
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But then again. I'm use to big bore motors. So I might not be the right person to listen to for a stock cylinder
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Hickwheeler,
That was some great input and comparison between the Pro Circuit and FMF pipes. From the reading I've done...... I've read a lot more about folks using the FMF pipe and being happy with the results they've seen from them. I'm also realistic with this and understand this won't ride like a big bore or PV motor. I'm just looking to uncork some of the goodie of the stock motor. The big motor will come later lol.
I was essentially down to the FMF and Pro Circuit for the main reason of needing a forestry approved spark arrestor. Just in this thread there have many numerous mentions of the FMF being a good pipe to run and I think that is what will go on my R for the time being.
The input and help from you folks is greatly appreciatted!!! I'm always out to learn from those more knowledgeable, sure helps me make better decisions lol.
I'm always open to input and feedback so don't shy away from telling me what you think.
Thank you guys for the help!
Tony
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I was essentially down to the FMF and Pro Circuit for the main reason of needing a forestry approved spark arrestor.
Tony
You can run the fmf forestry approved silencer with most of the 250r pipes out there. Most of them were made with the stock silencer mount location and are interchangeable with each other. All of the non center mount ESR for example and led lrd that do not have a big stinger. There are a lot of options for you that will actually perform better then the fmf or pro circuit.
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etccb,
That is really good to know about the FMF turbine core silencer........thank you for that nice tid bit of information!
Tony
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Another cheap & easy mod is switching to an 85-86 ATC head gasket for a little more compression.
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Broken1,
That is a great tip about the head gasket from the ATC's. The motor is pretty damn fresh so I'm not going to open it up at this time. I will keep that in my back pocket though for future reference!
Thanks again for the input folks, it has been a great help!
Tony
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If you're riding woods/trails you'll probably like the Boyesen Rad Valve more than VForce2/3 for you reed cage. Tends to give a little more low-end power. Aftermarket reed cages can really wake up an engine.
FMF is a great all around pipe for a stock cylinder build. But like others said, the FMF or Pro-Circuit spark-arrested silencers can work with quite a few off-the-shelf pipes. The ESR TRX5 is universally known as the best all around off-the-shelf 250r pipe.
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those new ESR pipes look great. However, i am not seeing a standard mount on the site.
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Tbone07,
That is really good to hear about the ESR TRX5 pipe. The rebuild has kind of gone sideways on me. What was going to be a replace bearings and get it tuned up and running great has turned into a full on build lmao. It all started with the rear axle and carrier. I was going to do the carrier bearings and realized the axle was bent on both sides. So, a new LSR axle was ordered along with billet carrier, brake stay, and hubs.
Given the new axle is a good bit wider than stock, that meant I HAD to order new front suspension as well lol. ;) Went with LSR DC-4 long travel with Elka 5's all the way around. This led to a new steering stem and Precision clamps, Hiper wheels, all new plastics, carbon fiber parts, and the list is getting long at this point. The more I look at the motor....... the more I can't leave it alone despite a fresh topend rebuild. So I'm trying to get a hold of ESR and see what he can come up with for an engine package. That guy can be a tough fella to get a hold of it seems!
The frame thankfully is in perfect condition, so I'm adding a Pumashine full gusset kit to it now and getting everything tidied up to send off for powder coating.
Once I get the frame back from powder coating I'll start a new thread documenting the build and progress. My banshee frame took about a month so things won't happen fast but I can collect the parts in the mean time and be ready to build when the frame gets done. ;D
Stay tuned and I'll get things rolling as soon as I can. Thank you everyone for your help and input........ it is greatly appreciated!
Tony
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Tbone07,
That is really good to hear about the ESR TRX5 pipe. The rebuild has kind of gone sideways on me. What was going to be a replace bearings and get it tuned up and running great has turned into a full on build lmao.
...So I'm trying to get a hold of ESR and see what he can come up with for an engine package. That guy can be a tough fella to get a hold of it seems!
Once I get the frame back from powder coating I'll start a new thread documenting the build and progress.
Tony
The only thing left original from my original 250r is the plastics, So I and just about everybody on this site knows how crazy you can get on a build. It's an obsession.
Eddie @ ESR is in the middle of moving his shop. If you need to place an order, the best way is just to do it through his website. But yes if you want to talk to him he can be hard to contact. Maybe shoot him an email and he can call back at his convenience.
Well we'd love to see a build thread on this site. There hasn't been a good one in quite some time. Look forward to seeing your progress!
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The rebuild has kind of gone sideways on me. What was going to be a replace bearings and get it tuned up and running great has turned into a full on build lmao.
Ah! The proverbial opening of a can of worms. Been there done that. Oh honey, just going to spend a few hundred bucks. You'll get the satisfaction, of doing it the right way. Good luck and enjoy.
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Hello, as far as the carb goes, your 35mm will give you more low end power. Which is desirable for trail riding IMO. The induction charge moves faster at lower rpm, as opposed to a 38 mm ,causing the air / fuel to mix better for a better burn, hence more low end. I have a 35 mm air stryker and it has gobbs of low end. I do a lot of trail riding.