CB350 rebuild at home

Tags: #<Tag:0x007ff8a4a089e0>

yasirsa (yasirsa) 2013-10-28 16:29:10 +0500 #181

Thanks God am not doing it alone and as I said before it's my first time I have ever open engine. When I about to open this engine I was like lets start from 70cc engine.can't type more it's my cell phone. Maybe tomarow
Today when came from Office I started cleaning head and cylinder oh God this is the most difficult job and it's still not clean as I wanted wd40 petrol surf detergent but it's still pending

Any helpful tip
Sent from my LT26i using PW Forums mobile app

yasirsa (yasirsa) 2013-10-28 16:38:56 +0500 #182

Sent from my LT26i using PW Forums mobile app

Xulfiqar (Xulfiqar) 2013-10-28 23:49:16 +0500 #183

get it blasted at a glass workshop - it will look factory new if blasted with glass beads, you might also want to paint this flat black and then use a sandpaper to expose only the fins - it looks very nice on aircooled motorcycle engines

yasirsa (yasirsa) 2013-10-29 03:38:42 +0500 #184

hearing this first time i guess this service is not available i will try to search but i want to know other options as well

msabbasi (msabbasi) 2013-10-29 09:36:53 +0500 #185

Dear Yaser Sb.,

What Zulfiqar has said is the right approach but since you do not have access to sand/grit/bead blasting service. May I suggest the following?

I normally do not give suggestions on this web site if I have not personally tried or seen it. This is the first time I am going to hang on a limb and say the following based on just logic. Please understand that I have not tried it myself.

From the pictures of the cylinder block, what you have is dried/burnt oil plus dried/hardened dirt. Both these are attacked by strong caustic. Strong caustic is commonly found in paint remover and oven cleaner. Paint remover will be available from your normal paint shop and oven cleaner from a good Super Store. Please be warned that if you do not wear rubber gloves you will most certainly BURN your fingers/hands. Oh and you MUST wear goggles. If you don't have that, just wear normal glasses. Both Paint remover and oven cleaner are very strong caustic. You must have a bucket of water nearby. If you get any of the stuff on your hands or eyes, wash liberally with water.

I don't know which of the two will give a better result. You also will need a stiff brush that will go in between the fins to work the chemical in the fins. I winder if a tooth brush will fit :o

Spring Cleaning: The Oven with Easy-Off #EOSpringCleaning - Lilac City Momma

Apply the chemical, allow for a few minutes for it to begin its work and then use the brush to further scrub the area. Finally wash the head in water and allow drying. Minor surface rust may appear on the cylinder bores. This must be cleaned right away and coated with a thin layer of oil and kept ready for assembly.

Hope this works

Xulfiqar (Xulfiqar) 2013-10-29 14:55:12 +0500 #186

the problem with caustic cleaners like oven cleaner is that if they are too strong the metal oxidises too fast and will result in a blackened finish which we dont want. WD40 is a nice cleaner but slow and expensive.

Media blasting will be available if you have seen some markets where they sell "etched design glass" - they use blasting to create those designs.

msabbasi (msabbasi) 2013-10-30 00:41:09 +0500 #187

Zulfiqar,

You are right about Caustic attacking aluminium. Something I overlooked while guiding Yaser in an alternate method for cleaning. This morning I went to my lab (the kitchen) and did a test of oven cleaner on aluminium. The cleaner did not attack the metal. However I did not have paint remover on hand to test it.

Perhaps Yaser could test an inconspicuous area of the block before proceeding. Glass etching is most probably not done in Peshawar. To my knowledge the nearest such service is in Lahore. Even Pindi people get this done from Lahore.

yasirsa (yasirsa) 2013-10-30 04:01:47 +0500 #188

dear xulfiqar and abassi sab

                i bought carb cleaner for this job it was working fine but i think i need smallest steel or iron made brush becuz nokia screw driver with cloth wasnt reaching these end corners when  carb cleaner was making full pressure burst all it needed to wipe out but i thought pushing cloth with Nokia screw driver will make this job done but it wasn't reaching there i did tried wd40 kerocin oil before but carb cleaner is good

and sorry no media blasting. we are the peoples only juggar makers and feel proud when this juggar is done in not recommended machine and we lough and tell the story while we are free

Xulfiqar (Xulfiqar) 2013-10-30 04:31:23 +0500 #189

dont use a steel brush on alumnium fins - use a copper pipe (hammered to sharp edges) - it wont scratch the aluminium (thats how i cleaned pistons and other alu parts)

msabbasi (msabbasi) 2013-11-03 11:42:15 +0500 #190

Yaser Sb.,

Very quiet from your side. I hope you have not decided to abandon your project.

yasirsa (yasirsa) 2013-11-03 13:45:25 +0500 #191

No abassi Sab am waiting for proper day

Sent from my LT26i using PW Forums mobile app

msabbasi (msabbasi) 2013-11-03 14:37:41 +0500 #192

OK Good

msabbasi (msabbasi) 2013-11-06 04:59:41 +0500 #193

Yaser Sb.,

It has been very quiet from your side so I have been looking at other CB350s on the net. I have been comparing your bike pictures to other similar bikes. I have to say that your bike is in very original condition. It has not been ruined at all. I took the liberty to compare your bike to another from the internet. Here is what I found:

I think what you have there is a pretty good looking machine. It just needs a little more work to be a classic. Please don't loose interest.

Regards

yasirsa (yasirsa) 2013-11-06 05:33:13 +0500 #194

yes abbasi sab its pretty in good shap with no rust . actully my parents are comming after performing hujj Alhamdu lillah and am the only 1 who is managing everything at home . plus rainy days plus shadi season i have to go every wehre and i dont wanna go so quick .

yasirsa (yasirsa) 2013-11-07 13:55:25 +0500 #195

Sent from my LT26i using PW Forums mobile app

dr3vil (Maalik ) 2013-11-07 14:59:34 +0500 #196

kia baat hai balenos se ab direct jump
i regularly visit ur thread but got no experience of bikes so i just read and log out
good luck
and to hell with rainy season i kinda hate it

yasirsa (yasirsa) 2013-11-07 15:15:09 +0500 #197

Next is Ke70

Sent from my LT26i using PW Forums mobile app

yasirsa (yasirsa) 2013-11-07 15:16:31 +0500 #198

And thanks for visiting boss will meet Shuba in someday

Sent from my LT26i using PW Forums mobile app

yasirsa (yasirsa) 2013-11-07 15:26:13 +0500 #199

Ok drum with shifter installed, clean and lube the bearings. Transmission installed took 4 hours I almost forgot resembling:rolleyes:
Ok installed bearing lockers and timing chain with crank but crank seems not ok in the mid you can see 2 bearings when I give it round with my hand force it get hard some times and some time it's smoth I think I must take it to my machinist.

Sent from my LT26i using PW Forums mobile app

msabbasi (msabbasi) 2013-11-08 00:50:05 +0500 #200

Salam Yaser Sb.,

Nice to see you are back on the project. you are right, you need to go to your machinist. Take the entire assembly to him so he can see what is going on. Without seeing the engine, I am thinking that when you turn the engine, the chain is turning the cam also. I would suggest to remove the chain and turn the cam by hand separate to the crank and then turn crank separate from the cam. You will find out which is the one with the problem. My obvious guess is that the line of one of the two is not straight or you have ovality on the bearings.

You machinist will be able to figure it out. I may be wrong but my mind goes to the cam bushes that were not line bored. I noticed that your machinist did not have a dial gauge. To get a proper idea of what is going on you may need to check your engine with a setup similar to this.

If your mashinist uses a wire and feeler gauge to check the trueness and then I would strongly suggest to find another machinist.

If your problem is the crank shaft, just off the cuff, usually crank issues are one of the following:

1 - Crank is not straight
2 - Crank main pins are oval
3 - Crank case line is not straight.
4 - Main bearing clearances not correct

We used to take measurement of crank web deflections to figure out what was going on. But in your case the crank is too small to fit a dial gauge in the web of the crank.