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Dealers - Honda Trail Bikes |
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This kit includes an 88cc cylinder and piston, super
head, manual clutch kit, and a high volume oil pump.

Wonder if this philly knows how famous she is, kind of like
this lovely lady?

And I wonder what they look like now?
Honda Trail Bike been around
since '95, and have mainly been into restoring old 50's, but a lot of the
parts for those bikes apply to the newer XR/CRF50, so they sent me some
motor mods including an 88cc top end and a large valve head, 20mm carb, high
volume oil pump, and a manual clutch to replace the auto clutch. I would
never have sprung for these on my own, but thanks to these fine folks, I can
do a product review on them and let everyone know how well they work.
Riding impressions are at the bottom of the page.
I compared the
HTB (honda trail bike) 88cc piston to the Takegawa piston and they are
not interchangeable. The HTB piston has a higher
dome on top of the piston while the Takegawa is flat. I can only guess that its
to raise compression and match the "super head". Also, you're not using your
fancy cam with the super head. It is a whole different animal and a cam designed
to fit a stock head ain't even close to this setup.
What's a super head? It's an aluminum replacement head that
has larger valves.
I've put together a few motors now, and its not brain
surgery. Line up the "T" on the flywheel with its mark, and the "O" on the cam
sprocket with its mark, and that covers the cam timing. The rest is just bolting
and unbolting parts. A torque wrench assures the head is tightened evenly and
properly, use the cris-cross pattern, and lining up the piston rings is something to look for. Lube
everything that will move, don't wait for engine oil to get there. I took apart
the manual clutch and it had a teeny bit of oil on the plates, so that might
have been good enough, but for sure spread oil on the piston and cam lobes to
assure no metal to metal contact. Oil film keeps the metal from touching (and
bonding).
As always, you'll need to put the bike up on a stand
because the footpegs and kickstand support are coming off, and remove your skid
plate and rear brake lever. Give yourself plenty of room. Kickstarter and
shifter come off also, and drain all the oil out of the engine. I installed the
whole package here and it's logical as you'll see, parts that come off for
replacement needed to come to gain access for other parts to be installed.
Before taking off the clutch cover, put a bucket under the
engine. All the oil didn't come out yet. Crack off the 8mm hex screws and remove
the cover. A few parts will drop out also, these are the actuator parts for the
clutch that operate off the shifter. When you pulled or pushed on your shifter,
you push in on the clutch and these parts are what did that.
The fun part is getting the clutch off. I had an easier
time this time because I used my trusty impact driver, and I stuck a screwdriver
in the gear between the primary and the clutch gear so it wouldn't budge, and
the four flathead phillips screws popped right out this time. After getting the
cover off, reach in and push the washer tab off the clutch retaining nut, and
turn the nut off. I gave it a few taps with a punch and it turned right off. Now
the clutch will slide off the crank.
  
The manual clutch kit comes with a new shifter arm because
it doesn't need to push on the clutch any more, you're going to do that with a
cable now. The shifter shaft will pull right out after you unbolt two of the
items holding it on up by the shifter cog. Put in the new shaft and replace
those two items and the shifter shaft is complete. No brain surgery yet. Now,
before I put on the new clutch I noticed the oil pump. You wouldn't be able to
access this with the clutch in the way (I think). Maybe you would, but this is
definitely the right time to change that out.
For the high volume oil pump to work properly, you'll need
to drill out the oil hole leading into the cylinder. They instructed me to drill
a 2mm hole, but who has metric drill bits? A 5/64 bit is real close, but to get
at the hole you'll need to pull off the cylinder, the head and one of the
cylinder studs. Once again, another part (or series of parts) needs to come off
to gain access.
Once that hole has been enlarged and you're sure no metal
chips were left behind, put on the new high volume oil pump. Now you can slide
on the new primary gear, clutch gear and its bushing, and the manual clutch.
Before you put on the cover, make sure you have all the seals installed that
they gave you. One is for the kickstarter hole, and the other goes underneath
the clutch actuator arm. You need to disassemble the cover where the actuator
arm pivots and find the hole that needs the seal. Always use grease on the
inside of new seals, rubber wears quickly if unlubed, but when greased it has no
contact with the metal.
You're ready to put on the cover with its new gasket. The
top end that you took off to get at the oil hole can be installed also and your
ready to ride. Remember to give everything a nice break-in period of about 5 or
10 minutes real easy, then about 1/2 hour of riding but not hard abuse. You need
to be sure motor lube is everywhere, and if there was a sharp corner or a high
spot that needed to be worked off, it did, and the metal particles have worked
their way out.
Don't be afraid to get a manual clutch, and for $155 it
ain't a bad buy. As soon as we crack the freezing mark and some of this snow
melts I'll let you know how well it works.
Riding impression of the 88cc kitted bike.
This baby has GREAT torque, and since it has a 20mm carb,
you'd figure it would have great over-rev. It does not disappoint!! I really,
really like this motor. The frame that I have it in holds it back a little, but
this motor is not down on power from a Takegawa kitted 88 at all, and I think it
is probably stronger. The rev's seem to turn just a little slower than a
Takegawa bike, but that could be the pipe or something else. I have the Big Gun
pipe on this kit, and a Fast50s pipe on my Takegawa, and you've heard it before,
I love that Fast50s pipe.
Riding impression of the Manual clutch
This kit works well and makes your fiddy feel like your
bike bike. You can fan it a little, but I wouldn't abuse it. It doesn't look
like it would hold up to a 125cc two stroke screamer rider that fans the heck
out of his clutch. All my buddies that jump on this bike snub it when they don't
pull in the clutch right away. The tendency on a fiddy is put it in gear and go.
Even I do it once in a while. I go faster on an auto clutch believe it or not.
With an auto, I get on the gas when I'm still on the brake in corners and meter
the power out that way. With a clutch it's one more thing to think about, but a
coordinated person would probably have no trouble.
Would I pay money for the manual clutch?
I'm sorry, but if it's a fiddy, it needs the auto clutch.
Yeah, it's nice to be manual, but it's overkill in my opinion. This kit works
fine once you locate a lever assembly, and make sure you keep the cable off the
pipe or it will melt!
I would not pay money for this kit, put in HD springs and
call it a day.

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