CB350 rebuild at home

[yasirsa]

Don't like it's sound

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[yasirsa]

I drive 80 to 90km speed it's vibrat and 100 it smoth

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[Xulfiqar]

the toyota 4K is very smooth sounding, I think your engine is using a replacement cooling fan which causes a lot of air sound. You can remove it and use an electric fan with thermoswitch or use a clutched fan.

If its mechanical noise then check the valve train, the rockers/shafts do wear out in time and if your engine is running cold all the time (missing thermostat - 99.99% of 4K engines are missing it) the wear gets worse.

For vibration you have driveline or suspension bushings problem not engine problem.

[Xulfiqar]

make sure your machinist uses this tool to measure the crank trueness. I literally wanted to smack the machinists who eyeball it and say "set hai"

//youtu.be/bs1yCpomCKM

I trued the crankshaft of my little RX115 this way, installed it very carefully using a puller tool and it was pure joy once the engine started, almost no vibration at speed. Just smooth power. The fact that I tuned it to exact factory spec helped a lot too.

[yasirsa]

youtube is ban kindly past me link so i can see it

make sure your machinist uses this tool to measure the crank trueness. I literally wanted to smack the machinists who eyeball it and say "set hai"

//youtu.be/bs1yCpomCKM

I trued the crankshaft of my little RX115 this way, installed it very carefully using a puller tool and it was pure joy once the engine started, almost no vibration at speed. Just smooth power. The fact that I tuned it to exact factory spec helped a lot too.

[Xulfiqar]

https://www.youtube.com/watch?v=bs1yCpomCKM

[margallar]

it won't work this way, a proxy software like hotspot shield is required to open youtube

[yasirsa]

it won't work this way, a proxy software like hotspot shield is required to open youtube

thanks margaller. i did it in the same way . saw video usefull information. next is buying a spray machine it is pipline i will need ur advices too;)

[yasirsa]

[yasirsa]

i think camshaft is never been used. but got rusted i hope it may be usefull for me. this engine get half as u can and am going to search best sealing product to seal it

[margallar]

the paint spraying is going to be a great learning experience,i have never experienced it either (though i really wish i had a chance)

[Xulfiqar]

that camshaft is dead, try to get a machinist to clean it up, if the lobes are pitted, you need to find a new one.

btw for sealing the crankcase, threebond 1194 is the only product you should use if you want a guaranteed leak free engine. If you use any other cheap curil, bathroom silicone RTV compound - you will have leaks like a "channi"

[yasirsa]

I hardly found this camshaft. And tomarow am taking whole parts to machinist. And for sealing purpose you said is it available in Pakistan?

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[yasirsa]

that camshaft is dead, try to get a machinist to clean it up, if the lobes are pitted, you need to find a new one.

btw for sealing the crankcase, threebond 1194 is the only product you should use if you want a guaranteed leak free engine. If you use any other cheap curil, bathroom silicone RTV compound - you will have leaks like a "channi"

Three bond

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[Xulfiqar]

yes - very easily available in Karachi marriot road industrial tools/machinery market. Atlas Honda Limited should also have it - its called Hondabond forgot the part no. but its used to join the crankcases of all Honda motorcycle engines, whether its a CD70E or a Superblackbird engine.

[yasirsa]

yes - very easily available in Karachi marriot road industrial tools/machinery market. Atlas Honda Limited should also have it - its called Hondabond forgot the part no. but its used to join the crankcases of all Honda motorcycle engines, whether its a CD70E or a Superblackbird engine.

Ok thanks I'll search for it. Can I wash out engine parts? For a clean assembling

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[Xulfiqar]

Yes cleanliness is a must, you should also have the cases bead or sandblasted for good looks. And please do not use any of the original screws, get proper allen head screws

[yasirsa]

Yes cleanliness is a must, you should also have the cases bead or sandblasted for good looks. And please do not use any of the original screws, get proper allen head screws

Adding sleeves or cylinder what is best?

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[yasirsa]

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[msabbasi]

Adding sleeves or cylinder what is best?

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Adding sleeves or not depends on the clearence between the piston and cylinder. The rule of thumb is 0.002" to 0.003" clearence per inch of diameter. I recall you mentioned that the pistons are 66mm diameter and 025 was stamped on the crown so we can assume that your piston OD is 66.25mm. With that piston size your cylinders should be no larger than than 66.38mm to 66.45mm. DO NOT USE FEELER GAUGES TO MEASURE PISTON/CYLINDER CLEARENCE. The proper tools are a micrometer for the piston and a bore gauge for the cylinder. Read this for more info:

http://www.jepistons.com/PDFs/TechCorner/SCPDrawings/piston_instrc4032.pdf

While taking cylinder readings you will have to take multiple reading down the cylinder at 12, 3, 6 and 9 O'clock to asertain if there is any ovality or tapering of the cylinders as well as formation of ring ridge of cylinder wall. Permissible ovality is 0.005" and pemissible taper is 0.005" also.

Have a read of this online book. Good stuff here:

Automotive Service: Inspection, Maintenance and Repair - Tim Gilles - Google Books