Planet Minis

arlindsay1992 · 09-01-2006, 10:27 AM

Well I have found that my ehaust valves is bent. So I am buying a used head with the valves from a PM member. I am also ordering from DrATV:
-HD valve springs
-a top end gaket set
-valve spring compressor tool
-new IRC tire

Today I couldn't progress any further so I decided to organize the TERB. I took the engine out of the frame and tied it down to a workbench so I don't hurt by back from leaning forward so long. It's really secure because I tied it down and then screwed the workbench apart so it pulls the rope tight. All the parts are clean and orgainzed and I can begin work when I order the parts and/or get some spraypaint.

Tied down.

Taken apart

Engine parts.

Various parts.

A few nuts and bolts.

More parts.

And some more.

lowbike1 · 09-01-2006, 10:31 AM

I think you like taking it apart more than you like riding it dont you?

arlindsay1992 · 09-01-2006, 10:33 AM

Not really. It's fun but riding is more fun.

dayj1 · 09-01-2006, 10:38 AM

Any idea on what caused the bent exhaust valve?

/dayj1

arlindsay1992 · 09-01-2006, 10:42 AM

Someone said the valve clearace is 0.003 on CRF50s and I had it on 0.002 because that is the Z50R setting. That would puch the valve down further and make it potentially hit the piston.

arlindsay1992 · 09-01-2006, 10:43 AM

And the valves were probably foating also because I was running the stock springs with the high lift cam.

SprNtrl · 09-01-2006, 11:53 AM

I think it was more along the lines of valve float that caused the bent valve, rather than the valve being ushed 0.02mm more.

35yoldfiddyrider · 09-01-2006, 01:14 PM

Q,You sure have some spunk and energy!

You say your 14 years old? Keep up the good work man!

Good luck on your TERB....

arlindsay1992 · 09-01-2006, 01:53 PM

Yeah. Most people don't believe what I claim to do. They say oh that's cool and then I say I'm 14 and they doubt me. Not on forums but like when I talk in person.

dirtbkr188 · 09-01-2006, 04:09 PM

Quote:

Originally Posted by SprNtrl

I think it was more along the lines of valve float that caused the bent valve, rather than the valve being ushed 0.02mm more.

I'll second that, those stock valvetrain components aren't meant to take a sustained high RPM range, full throttle, for miles at a time. A modified engine with bigger displacement is a different story, they have the ability to be geared tall enough for sustained highway travel (ala fatcaaat or reynolds_brad style).

arlindsay1992 · 09-02-2006, 10:52 AM

I'm in the process of buying a 2005 head with valves so that I can put in the HD valve springs and have nice valves that were broken in with the head. If I got new valves for my current head, I'd have to lap them and the valve set is like $60 from http://www.bikebandit.com/.

arlindsay1992 · 09-02-2006, 10:52 AM

I'm paying $18 shipped for this head.

arlindsay1992 · 09-03-2006, 04:26 PM

This is the current state of my TERB. I'm waiting on my dad to order some parts for me.

FastMC · 09-03-2006, 05:17 PM

So sad!!

You need a backup bike to ride while your "Terbing" that one!!!

arlindsay1992 · 09-03-2006, 05:19 PM

I did but we sold it and I got to keep half the profit. That money is going into this TERB.

arlindsay1992 · 09-09-2006, 02:37 PM

I managed to make my own high compression piston. I took a 1984 Z50R piston and ground down enough with a dremel to make it fit with a CRF50 head and TBQ cam. I know it will not bash inot the valves because I checked it without the base gasket and a used head gasket. If I had used a new head gasket, there would be more room than a torqued down one because it wasn't compressed. So when I put in a base gasket, then there will be even more piston to valve clearance. So I will test it with an old head before I put on a good one. (just in case I'm wrong about it fitting)

09-01-2006, 10:27 AM	#1 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	The top end rebuild (TERB) Well I have found that my ehaust valves is bent. So I am buying a used head with the valves from a PM member. I am also ordering from DrATV: -HD valve springs -a top end gaket set -valve spring compressor tool -new IRC tire Today I couldn't progress any further so I decided to organize the TERB. I took the engine out of the frame and tied it down to a workbench so I don't hurt by back from leaning forward so long. It's really secure because I tied it down and then screwed the workbench apart so it pulls the rope tight. All the parts are clean and orgainzed and I can begin work when I order the parts and/or get some spraypaint. Tied down. Taken apart Engine parts. Various parts. A few nuts and bolts. More parts. And some more.

09-01-2006, 10:31 AM	#2 (permalink)
lowbike1 3rd Gear Member Join Date: Oct 2004 Location: Maple Ridge BC Canada Posts: 2,125	I think you like taking it apart more than you like riding it dont you?

09-01-2006, 10:33 AM	#3 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	Not really. It's fun but riding is more fun.

09-01-2006, 10:38 AM	#4 (permalink)
dayj1 1st Gear Member Join Date: Jun 2006 Location: Athens, Alabama Posts: 183	Any idea on what caused the bent exhaust valve? /dayj1

09-01-2006, 10:42 AM	#5 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	Someone said the valve clearace is 0.003 on CRF50s and I had it on 0.002 because that is the Z50R setting. That would puch the valve down further and make it potentially hit the piston.

09-01-2006, 10:43 AM	#6 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	And the valves were probably foating also because I was running the stock springs with the high lift cam.

09-01-2006, 11:53 AM	#7 (permalink)
SprNtrl 3rd Gear Member Join Date: Jul 2005 Location: Toronto, Canada Posts: 1,183 My Mood:	I think it was more along the lines of valve float that caused the bent valve, rather than the valve being ushed 0.02mm more.

09-01-2006, 01:14 PM	#8 (permalink)
35yoldfiddyrider 1st Gear Member Join Date: Jun 2005 Location: MICHIGAN Posts: 105	Q,You sure have some spunk and energy! You say your 14 years old? Keep up the good work man! Good luck on your TERB....

09-01-2006, 01:53 PM	#9 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	Yeah. Most people don't believe what I claim to do. They say oh that's cool and then I say I'm 14 and they doubt me. Not on forums but like when I talk in person.

09-02-2006, 10:52 AM	#11 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	I'm in the process of buying a 2005 head with valves so that I can put in the HD valve springs and have nice valves that were broken in with the head. If I got new valves for my current head, I'd have to lap them and the valve set is like $60 from http://www.bikebandit.com/.

09-02-2006, 10:52 AM	#12 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	I'm paying $18 shipped for this head.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

09-03-2006, 04:26 PM	#13 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	This is the current state of my TERB. I'm waiting on my dad to order some parts for me.

09-03-2006, 05:17 PM	#14 (permalink)
FastMC Sporting the Merkin Join Date: Mar 2004 Location: boston area Posts: 5,072 My Mood:	So sad!! You need a backup bike to ride while your "Terbing" that one!!!

09-03-2006, 05:19 PM	#15 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	I did but we sold it and I got to keep half the profit. That money is going into this TERB.

09-09-2006, 02:37 PM	#16 (permalink)
arlindsay1992 "High Speed Record Guy" Join Date: Mar 2006 Location: Northern Virginia Posts: 4,369	I managed to make my own high compression piston. I took a 1984 Z50R piston and ground down enough with a dremel to make it fit with a CRF50 head and TBQ cam. I know it will not bash inot the valves because I checked it without the base gasket and a used head gasket. If I had used a new head gasket, there would be more room than a torqued down one because it wasn't compressed. So when I put in a base gasket, then there will be even more piston to valve clearance. So I will test it with an old head before I put on a good one. (just in case I'm wrong about it fitting)