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By Tiffany Rowland
I bought an 07 honda trx400ex for my daughter 11th birthday. I've been having alot of fun fixing it up but after reading some of the posts about safety I think I may have gotten a little carried away. I put an exhaust on that added 10hp, a k&n performance filter, new carb, a stage 3 rev box and coil, and I wrapped the exhaust. The top speed started out at 92mph and we're well above that now. My main concern, though, is low end throttle. Is there any way I can do something thate will decrease the rate of acceleration without taking off the modifications I've done? She's super cautious and won't go over 10mph but I'm worried that she may have a hard time controlling it after these last few upgrades.
Thought i would share a fix that I came across. I was working on a 99 scambler 500, The customer complaint was that even with the fuel shut off the tank would slowly drain out onto the ground. First I found the fuel shut off was bad/ leaking/ dripping so I installed a new one thinking that would fix it. Then I ran it and and seen that the overflow was flowing fuel out from the bowl. So I cleaned the needle and seat and changed the float height to lower the fuel level in the bowl. Well... It still overflowed and flooded. So I bench tested the needle and seat with a pop off tester. I found that these newer style needle and seats just utilize an o-ring to install the brass seat into the carb.
The o-ring for the seat had hardened up allowing fuel into the float bowl from under the seat. New o-ring and problems solved.
I made my intro about a QuadRunner I was working on and found a multitude of problems. Most I fixed, but I'm thinking that I'll be making more trips to see the 90' LT-250/4WD. Age and needing regular attention is the reason. The owner, NOT being mechanically inclined, adds into the equation.
So, I deliver it and was offered, as payment, a 95' LT-250/4WD, with paper. It didn't run and had been sitting outside for last 12+ months. It was (basically) all there. This happened Saturday and this "Barn Find" came home to live out it's final years (I suspect).
Today I finally found time to look at her. Not a pretty sight. Rough life, many hrs....... MANY! Only 2399mi, but the speedo is disco'd. I just want to know if this will be worth pursuing. First things first, a really good cleaning. I hate working on dirty vehicles.
The battery actually took and held a charge! The carb was pulled, cleaned and the tank drained. Found a broken orange wire, dangling loose, near the carb. It was hot when the key was on and ended up connecting to a 10A fuse block. Well, I wonder why it didn't run???? Hmmmmmmmmmmmmm!
Carb back on, fresh non-eth fuel, had to remove the air filter for this test (needs replacement), sprayed a little ether..... hit the starter, fired and died. Third time's a charm, she runs. I'll be going thru things as I can and questions will follow, in this thread.
Hey guys, new here, but haven't found ANY answer to my specific problem on a Suzuki dedicated ATV forum, so here's to hoping!
I acquired a 95' Quadrunner 250, 4x4, (LT4WD) for practically nothing with no spark. The PO had tossed in a used stator which didn't fix the problem... so I went all routes (though cheaply) to narrow down the initial problem of no spark.
Plug, coil, CDI (caltric) and stator w/pickup (caltric) were purchased and installed. And it RAN, but bogged horribly and would not rev past 1/4 throttle.
I checked fuel flow, vacuum lines, all the normal stuff, no issues. I decided to check the valves and cam... well, there was one problem. The cam was 1mm under the lowest spec in the manual. So, in-came a new cam, Stage 1 Hotcams... also threw in a new set of shindy valves, lapped them, replaced the valve seals, and the timing chain.
Back together again (w/stock airbox and new oiled filter). Now it idles even better, still boggs at 1/4 throttle, but will rev past it if you hold the throttle open for a second. Ahaha... success!
So I was able to ride it above 1/4 throttle once I had momentum... could shift through the gears, all was good as long as I kept it over 1/2 throttle. Took a long enough ride to break in the cam properly at least so I won't have to worry about that.
Now, I start fiddling with the carb. It's clean as a whistle, stock, with stock jets (new replacement Mikuni jets). Same problem.
I start thinking, maybe this is fuel related and the bike is having an issue transitioning from idle jet to main jet... so I LOWER the needle by raising the clip 1 spot. Now it revvs up in neutral with no bog, but it boggs about the same trying to ride it. So I move the needle down again with the clip on the top slot. Better, but still has a bit of bog at 1/4 throttle.
The last bit of advice I got was to ditch the CV carb... so I sprung for a brand new Mikuni VM30-83 round-slide. Bolted it up, blew into the vacuum tube to fill it with fuel (no vacuum port on this one) and she fired right up... but there is still a bit of bog, it's just masked by the fact that I'm not waiting for the vacuum diaphragm to open.
So I feel like each little step brings me closer, but not perfect. I'm now wondering if this is still in-fact a carb tuning issue (I have some jets I can fiddle with and maybe lean-out the idle jet a little.) OR if the cheap-a** Caltric Stator/Pickup is what's causing these issues.
I have a 95' KingQuad with 400 miles on it... like new.. runs like a top... I've tried both the stock QR and the Caltric CDI boxes on it, and it revvs up and runs like a champ.
The only unknowns between the two systems are the carb, and the stator/pickup. My next step in troubleshooting is to rip apart the King Quad and test it's CDI on the Quadrunner... but considering there is no change to how it runs I doubt it will lead to a solution.
HOWEVER... I tried the stock CDI just recently after running the Caltric this whole time, and the bike runs like garbage. Hardly idles, and won't rev up at all. So, that is my one smoking gun telling me that it's either the pickup coil or the stator itself.
Has anyone had a problem even CLOSE to this? I can't image the carb would be causing this many issues, especially going to 2 different ones, both with stock jetting to OEM, and exhibiting the identical symptoms... the only change is when different CDI's are plugged in, or when the needle valve leans out the mixture.
Also, I checked the piston, rings and bore when I had it apart and they're like-new... no scoring, rings are loose, cylinder is still round and has honing marks still int he bore. Stock piston, stock bore size and it has 160psi compression. Battery is brand new, and I've tried 3 different R/R's, none of which change any symptoms, but slightly vary the charging voltage by .2-.5 of a volt depending on which unit. Also tried a new coil which changed nothing.
ANY help would be appreciated. Too much invested to not get it running right.
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Hello everyone, I have a new to me 86 Bayou 300 that I just bought last night to get around the property. It wouldn't start when I bought it but it did turn over with starting fluid, PO said the carb neeeded cleaned. I cleaned the carb today but need to get the choke wired up as it was not wired up when purchased.
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