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Discussion Starter #1
How far can I go on stroke on my TRX 350 Fourtrax 1986. Or is their an engine that fit my Atv that would be better then mine...but I like the low end and the torque that this engine provide but it beggin to be a lillte old... and I'd like to give it a second life...it's a 23 yold atv and it's gonna be my beast I wanna have your advice on the fuel and engine upgrade I could do on it!

Thanks in advandance and have an happy new year.

Jeepy
 

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With boring the cylinder you could get it close to a 400. I'm not sure about the stroke. You can also upgrade to a more aggressive cam, exhaust, intake. That would be a huge hop up.
 

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With boring the cylinder you could get it close to a 400. I'm not sure about the stroke. You can also upgrade to a more aggressive cam, exhaust, intake. That would be a huge hop up.
I agree^^^^^^
:icon_ deal:
 

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Well for starters boring will gain a few CCs using mine as an example... 250X = 246CCs 74mm stock piston 57.3mm stroke I am bored .050 over with an 80mm piston so to convert all of this to CCs we have to do the math..... bore X bore X stroke X.7854 = CCs so..you have to convert mm to cm so...8.0 X 8.0 X 5.73 X 0.7854 = 288.021888 or 288CCs if I were to add a stroker crank of +12 giving me 70mm of stroke then I would gain a full 102CCs making my 250 a 352. if You step your quad (a 350) up to an 86mm 10:1 CR piston you will be at 393CCs which is a big power difference add a cam larger bore carb, exhaust and filter you will have a pretty quick unit. Hope this helps.
 

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Discussion Starter #7
Woaw...I like those info moose..I'll record that in my computer then check for that kind of part so...thank a lot...but do you think it will still be a trustable machine? I want to keep it an other 5 years at least.
 

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Check www.powroll.com I didn't see any stroker kits but i bet it wouldn't be beyond them to do it. As far a longevity I wouldn't be scared to say that you would get great service out of your quad as long as you keep up on the maintanance.

Woaw...I like those info moose..I'll record that in my computer then check for that kind of part so...thank a lot...but do you think it will still be a trustable machine? I want to keep it an other 5 years at least.
 

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Discussion Starter #12
New problem here on my rig I have a kick starter issue its kiking free...I'm french canadian so in my words its not kicking right some time it works some time it free...so even my electric starter dont go but the relay does its job it click all the way and I detect an electric value with my tester...It an on an off problem I'm waiting to dismount all the kick starter when I figure the problem I will post my fix...if you quys have experience on kicker starting issue I'll more than happy to hear about it.

I need a new decompression cable also so...I keep you aware of my progression if anybody need the same info...if not just to bad! some trick to help me!

Thanks in advance for those who have
 

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IF your decompression able is bad you may be stuck in decompress mode. or it's hanging up
 

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Discussion Starter #15
Wow you guys rock on! I ordered a new decomp cable, electric starter but like a dumb ass I let fall a washer behind the alternator while dismounting the starter spindle don't ask or add comment I know...its a begginner mistake I'll have to drop my oil, recycle it then dismount all the left crank case cover to reach that fugging washer out off there than pu my brand new starter put my decompression cable then I jump on the carburator. I bought a repaire kit it combine needle spring and jet! Let's see what it does to her...! Continue sharing your nice experience!

Honda for ever...for another 23 years at least! lol
 

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Discussion Starter #17
both but its seem like te electrical harness as a problem soe where the relay does is job but still some time the relay just goes "click" then nothing and the battery is good tho....I dont read voltage value on the starter pole when pushin de start button!....theeeeee...so I'll be a fourtrax 1986 pro at the end on this!

Coming up next Honda shop manual from Ebay...very rare from my research!

Any commentaries or Idea...I'm open to it!

Thanks!
 

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Discussion Starter #18
Little update here the Starter was seized, air filter been poorly maintained since the last 15 years...lol! The carb rebuilted with new slow and pilot jets and everything that come with a carb rebuilt kit. Opened the original fuel filter with my dremel it was an miserable mess inside of it. So no wonder why the engine was running squarely ( can I say this in english...?)Anyway that's it...pictures to come!
 

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Concerning the kick starter kicking free, sounds like the one-way clutch bearing is bad. That would make it kick free and sometimes it will catch and kick over. The one-way clutch bearing is also what makes the engine hold the 4-wheeler back when going down hill. If it's bad, it will seem like the 4-wheeler goes in neutral all of a sudden, sometimes, when going down hill. Just bump the throttle when it does this, and it will catch and hold the 4-wheeler back again.
 
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