Need some help with my bike

Christ · 03-24-2019, 10:15 AM

OK so i bought myself a rock mt 250cc I got it not running but when I took the top end apart I lost the timing on it and having a little trouble getting the timing back
The bike supposably runs off a crf 230 engine but I can't find anything about timing on the crf 230

Bruces · 03-24-2019, 10:52 AM

What do you mean “lost the timing “ ,do you mean you no longer have spark or that you dropped it on the ground and can’t find it or ?

Its_not_a_honda · 03-24-2019, 11:26 AM

You have timing marks on the flywheel and the cam gear. You have to get all the marks where they need to be with the crankshaft/piston to the correct stroke of the 4 cycle engine.

You can probably use any "old" single cylinder motorcycle manual to figure this out. Google is your friend on honda 125cc manual.

Megadan · 03-25-2019, 04:30 AM

These are pretty easy motors to get the timing marks lined up. The easiest part is to first set the crank at TDC by lining up the Line with the T mark next to it with the notch in the timing mark window hole.

Now on the cylinder head, the cam lobes should be facing down (not pushing on the rocker arms) and the cam gear should have two lines on either side of the cam center . Those lines should sit parallel to the edge of the cylinder head surface (bolts holding the sprocket should line up vertically with the piston).

Christ · 03-25-2019, 10:00 AM

I don't have a T mark on it I'm used too having three lines with their appropriate letters and I only have one with no mark

Pathfinders · 03-25-2019, 02:21 PM

I wish I could help you Christ. I will need all the help I can get getting into heaven. You owing me one would be a plus. Can't wait too tell the GF that Christ rides the same style bike I do.

Roy

Megadan · 03-25-2019, 02:41 PM

It's not unusual for the flywheels to not all be marked properly. Some have two lines, others only 1. Some have the mark letters, others don't. Kind of annoying really, but as long as you know that mark is TDC, then that is all you need. Get the camshaft lined up correctly and the chain in place, put the tensioner on and then slowly spin the motor over by hand to make sure things aren't hitting and everything is happening when it should and you should be fine. These engines are made to be simple, and being a 1 cylinder only helps with the simplicity factor.

Christ · 03-25-2019, 10:32 PM

Ok thanks for the help I was able too put it together and got it running

Christ · 07-23-2019, 07:47 PM

So idk I still haven't gotten the bike too run properly and have been busy but I after more research and asking my bike runs off a 169fmm motor so I wanted too ask what size jets should I have in a pz30 carburetor that it runs off

03-24-2019, 10:15 AM	#1
Christ Join Date: Mar 2019 Posts: 14	Need some help with my bike OK so i bought myself a rock mt 250cc I got it not running but when I took the top end apart I lost the timing on it and having a little trouble getting the timing back The bike supposably runs off a crf 230 engine but I can't find anything about timing on the crf 230
	0

03-24-2019, 11:26 AM	#3
Its_not_a_honda Join Date: Jan 2018 Posts: 410	You have timing marks on the flywheel and the cam gear. You have to get all the marks where they need to be with the crankshaft/piston to the correct stroke of the 4 cycle engine. You can probably use any "old" single cylinder motorcycle manual to figure this out. Google is your friend on honda 125cc manual. __________________ 2020 Kawasaki KLX300R, 2018 Yamaha TW200 If you want more of something, tax it less. If you want less of something, tax it more.
	0

03-25-2019, 04:30 AM	#4
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,147	These are pretty easy motors to get the timing marks lined up. The easiest part is to first set the crank at TDC by lining up the Line with the T mark next to it with the notch in the timing mark window hole. Now on the cylinder head, the cam lobes should be facing down (not pushing on the rocker arms) and the cam gear should have two lines on either side of the cam center . Those lines should sit parallel to the edge of the cylinder head surface (bolts holding the sprocket should line up vertically with the piston). __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	1

03-25-2019, 02:41 PM	#7
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,147	It's not unusual for the flywheels to not all be marked properly. Some have two lines, others only 1. Some have the mark letters, others don't. Kind of annoying really, but as long as you know that mark is TDC, then that is all you need. Get the camshaft lined up correctly and the chain in place, put the tensioner on and then slowly spin the motor over by hand to make sure things aren't hitting and everything is happening when it should and you should be fine. These engines are made to be simple, and being a 1 cylinder only helps with the simplicity factor. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
	0

03-24-2019, 10:52 AM	#2
Bruces Join Date: May 2018 Posts: 1,705	What do you mean “lost the timing “ ,do you mean you no longer have spark or that you dropped it on the ground and can’t find it or ?
	0

03-25-2019, 10:00 AM	#5
Christ Join Date: Mar 2019 Posts: 14	I don't have a T mark on it I'm used too having three lines with their appropriate letters and I only have one with no mark
	0

03-25-2019, 02:21 PM	#6
Pathfinders Join Date: Nov 2017 Location: Upstate SC Posts: 129	I wish I could help you Christ. I will need all the help I can get getting into heaven. You owing me one would be a plus. Can't wait too tell the GF that Christ rides the same style bike I do. Roy
	1

03-25-2019, 10:32 PM	#8
Christ Join Date: Mar 2019 Posts: 14	Ok thanks for the help I was able too put it together and got it running
	1

07-23-2019, 07:47 PM	#9
Christ Join Date: Mar 2019 Posts: 14	So idk I still haven't gotten the bike too run properly and have been busy but I after more research and asking my bike runs off a 169fmm motor so I wanted too ask what size jets should I have in a pz30 carburetor that it runs off
	0