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Ii have a 1970 honda ct 90 i bored half mil new piston and rings hand lapped valves new timing chain and tentioner and it smokes bad it has 150 lb compression on 5th kick what causes this

Posted by Terry Smith on

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Arnie Burke

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  • Honda Master
  • 7,336 Answers

Poor spark from bad batt. Or oil too thin like 20wt.Carb float level is off..get a clymer manual or library sec 629

Posted on Oct 21, 2019

5 Related Answers


  • 736 Answers

SOURCE: What causes premature wear in the rings and bore of BMW K75s?

the K75 has very reliable engine .. its unusual for it to fail in this way .. the frozen rings would suggest overheating and thats possible if the radiator fan fails (that happens often before your 80,000) .. many of the pre 1990 k75s would smoke after storing for awhile .. that was a ring gap positioning problem .. that was corrected in newer models .. the smoke however would not have damaged the cylinders .. maybe in the extreme could foul a plug .. is it possible that someone put something in your gas tank ??.. or could it have been run without oil/water or perhaps the wrong type oil (like transmission fluid) ... that engine should have lasted longer than most cars .. nice smooth bike ..

Posted on Jul 25, 2009


  • 269 Answers


This could be a number of things, none of which will be solved without revisiting the motor again. Give some thought to the following:
Check cam and gear timing. Did you repace the cylinder and or hone it, bore it? Did you gap and offset your rings correctly? Have you checked the valve train to see if you have a valve not closing?
You see there are a number of possible causes for will have to go through one at a time and eliminate them.

Posted on Oct 05, 2009


  • 248 Answers

SOURCE: I broke the timing chain

you probably have time 180 degrees out....4 steps....(1)piston top dead center...(2) camshaft aligned with marks...(3) dist set for #1 cyl to fire ...and (4) timing marks on damper pulley aligned with marker on the cover or eng block...good luck

Posted on Mar 13, 2010


  • 3567 Answers

SOURCE: Hi I am doing a simpile head & cylinder inspection

The diagram below should work for you. Put the piston on TDC. the OHC cam gear will have a single mark or may have two marks, see below. Be certain the front side of the chain is taut when mounting the gear. The cam chain tensioner keeps the back side taut.


Posted on May 25, 2010


  • 32 Answers

SOURCE: pistons filling up with oil

These definately means that the rings are bad or the valve lines. if the smoke is white then those are the two suspects and you need a technician to look at it.

Posted on Mar 10, 2011

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New valves, valve guides, valve guide seals; all fine but probably not needed. When the piston was changed, did you run a cylinder hone in the bore to check for distorted cylinder walls? Was the old piston seized up at any time? Were there scratches or grooves cut into the cylinder wall from being seized? Did the new piston get new rings? Chances are you will need to have the cylinder bored then install a new 1st oversize piston and rings. Please rate my answer.

I own a black pulsar 220 dts-i and it has run over 11000 kilometers.last month my gear was malfunctioning so i took it to the service station and then they opened the whole engine for it.after it got...

Blue smoke is usually a cracked piston ring or worn out oil ring.
The only time the valves should be suspect is if the valves were recently lapped or replaced.
It's possible in those cases that the valve seals might leak oil into the cylinder.
Most often though, you will be looking at the piston rings, and the cylinder itself might need to be honed or bored.
If the cylinders need to be bored because of gouging due to scraping of the cracked or shattered rings, then you will need an oversize piston and rings to fit the new bore.

Looking for a 2.2 ecotec timing chain diagram with pictures

Getting the timing chain back on these engines can be tricky and requires more than just a diagram to get right. Here is how the timing chain should be reinstalled. Keep in mind that this engine can cause damage to the valves if the timing chain has any problems while the engine is running so it may not be a bad idea to setup the timing system as follows and do a compression test to make sure that everything is in order there.
Install the crankshaft sprocket with timing mark at the 5 o'clock position. Lower the timing chain through the opening in the top of the cylinder head. Carefully ensure that the chain goes around both sides of the cylinder block bosses (See 1 & 2 in picture):

Install the intake camshaft sprocket with the INT diamond at the 2 o'clock position. Hand tighten a NEW intake camshaft sprocket bolt. Route the timing chain around the crankshaft sprocket with the matching colored link aligning with the timing mark. Route the timing chain around the intake camshaft sprocket with the uniquely colored link (1) aligning with the INT diamond:

Install the timing chain tensioner guide through the opening in the top of the cylinder head. Tighten the timing chain tensioner guide bolt to 10 N·m (89 lb in):

Install the exhaust camshaft sprocket with the timing chain matching colored link (3) at EXH triangle aligned at the 10 o'clock position:

Ensure the timing marks and the colored links (1,2,3) are correctly aligned:

Use a 24 mm wrench to rotate the camshaft slightly, until exhaust sprocket aligns with the camshaft. Hand tighten the NEW exhaust camshaft sprocket bolt:

Install the fixed timing chain guide. Tighten the fixed timing chain bolts to 10 N·m (89 lb in):

Apply sealant, GM P/N 12378521 (Canadian P/N 88901148) compound to thread and install the timing chain guide bolt access hole plug. Tighten the chain guide plug to 90 N·m (66 lb ft):

Install the timing chain upper guide. Tighten the timing chain upper guide bolts to 10 N·m (89 lb in):

Inspect the timing chain tensioner. If the timing chain tensioner, O-ring seal, or washer is damaged, replace the timing chain tensioner. Measure the timing chain tensioner assembly from end to end. A new tensioner should be supplied in the fully compressed non-active state. A tensioner in the compressed state will measure 72 mm (2.83 in) (a) from end to end. A tensioner in the active state will measure 85 mm (3.35 in) (a) from end to end.

****If the timing chain tensioner is not in the compressed state, perform the following steps. Remove the piston assembly from the body of the timing chain tensioner by pulling it out. Set the J 45027-2 (2) into a vise. Install the notch end of the piston assembly into the J 45027-2 (2). Using the J 45027-1 (1), turn the ratchet cylinder into the piston:

Inspect the bore of the tensioner body for dirt, debris, and damage. If any damage appears, replace the tensioner. Clean dirt or debris out with a lint free cloth. Install the compressed piston assembly back into the timing chain tensioner body until it stops at the bottom of the bore. Do not compress the piston assembly against the bottom of the bore. If the piston assembly is compressed against the bottom of the bore, it will activate the tensioner, which will then need to be reset again. At this point the tensioner should measure approximately 72 mm (2.83 in) (a) from end to end. If the tensioner does not read 72 mm (2.83 in) (a) from end to end repeat the steps required to return it to it's compressed state above.

Install the timing chain tensioner. Tighten the timing chain tensioner to 75 N·m (55 lb ft). Use a suitable tool with a rubber tip on the end. Feed the tool down through the camshaft drive chant to rest on the timing chain. Then give a sharp jolt diagonally downwards to release the tensioner:

Use a 24 mm wrench to hold the camshaft. Tighten the NEW camshaft bolts to 85 N·m (63 lb ft) plus 30 degrees:

01 ttr 225 smokes alot when start up

Sounds like time for a top end job. New valve guides, ( lap the valves ), new piston and rings and possibly a new bore. Some bikes have nickle coated sleeves and cannot be bored, You can get a new nickle sleeve to replace the old one. Your dealer will be the best person to say if you need a new sleeve or not. Parts are around $275 with a new sleeve.

Your best buddy didn't put a shot of oil in the gas tank did he? Drain the tank and put the gas in your lawn mower. Sorry to be the one with the bad news. At least now ya know what ya gotta do.

Please rate this answer. Thanks gunman_54321 < cool name

When motorcycle warms up it starts smoking

id say its time for a new set of piston rings sounds like youv got a busted oil ring
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