Hi,
After the circlip coming loose and destroying my malossi MHR cylinder I bought a metra kit 70cc kit. whenever i turn it over with the sparkplug in the piston hits the spark plug. I am using Br10es and also have a Br8es. any ideas? if i unscrew the spark plug untill it dosen't hit the cylinder it is really loose and hardly screwed in.
Thanks
Nathan
Put another gasket ander the cillinder,
use a shorter plug!!! the 'es' plugs have a long thread body, there is a shorter plug, 'eg'?? to may braincells ago....lol
rulz, we donn neeeed no steeenkin rulz....
inside rulz!!
Originally Posted by weasel221
Not a good idea unless the manual/boolet of the Metrakit cilinder says he needs a shorter plug (HS instead of ES) but thats unlikly.
I am guessing he installed the gaskets incorrectly, fitted only the thinnest set maybe?
Are you sure you got the electrode gap set correctly? 0,6mm???
the gap needed is too much for gaskets to space out, I installed everything supplied in the kit and even checked again just now when I checked the piston for any scratches or chips.
going to order a HS plug, not sure about the electrode gap? it's a cm or two that's needed though. quick question, do I need a BR9 or 10? I was thinking 10 because it will almost always be used on fast roads to and from college.
2cm??? wtf? thats imposible mate if its so much (more than 5mm) than you got the wrong cilinderkit, wrong piston, (maybe someone mixed stuff up in the shop?) or you got a long stroke crank in there mate.
If you fit a HS plug in a head that needs a ES its not gonna last, the edge of the hole and the threading in the hole will burn away and melted particles from that can seriously knacker your piston and barrel.
btw, how do you know the plug is touching the piston?
I can hear it, and also when the plug is only slightly done up I can see it get knocked.
The old kit was 80cc although I can not find anything to do with a crankshaft in the paperwork I have for it. I have a bill for a 80cc and it being fitted even a letter saying the brakes are adequate from the mechanic but no mention of a crank.
It's just under 1cm sorry not 2.
I looked over everything supplied with the kit and found nothing definitive relating to spark plug size, In the Metra Kit information it did say to use a "BR9" plug but did not go into any more detail.
may of been a 80cc kit that needed a longer crank? :S there is some...
If you dont tighten the sparkplug up fully and turn the engine the plug always moves a little from the presure behind it...
What happened to your other kit? maybe the krank is knackered and its that wich your hearing?
Use a caliper gauge to mesure how much room there is from the top of the cilinder to the piston wen its fully up.
I really think its highly unlikely that your sparkplug would be hitting the top of the piston mate, because if that was the case it probably would be hitting the outer edge of the cilinder head also.
Only way to find out whats goung on is to pull the head of the cilinderkit and look at the head with the plug in there and the piston, you can put a bit of paint on the electrode and turn the engine round and take the head off to see if theres any paint pressed on the piston.
I really dont think the plug is hitting the piston, unless the electrode gap is way to big or the crank is really messed up.
@Glen1990, if it was a Longer Stroke cilinder the piston wouldnt even get near the top mate with a stock crank, but if he has a normal stroke kit, and a longer stroke crank than hese got a problem, but like i said above i dont think anything is really hitting the piston at all (unless the crank is knackered really bad)
The circlip came out and lodged itself between the rings and the cylinder wall, was basically a new kit. will take off the cylinder head and put a photo up of what it looks like with the spark plug fully screwed in as soon as I get a chance. can't believe I didn't think of doing that before I put it all back together!
Now i remember yeah, well if anything of that debris or circlip it self got into the cranks big end bearing that would seriously mess it up, oh, and btw, are you sure you got the right needlebearing installed for the pistonpin???
is the needle bearing the same as a small end bearing? the one at the end of the crank? if so then I'm not sure, I used the one that was already in there as it seemed to fit fine and looked in great condition.
Which cillinder head are you using?
I bought it as one kit, http://www.adrenalin-pedstop.co.uk/p...ines-5034.aspx
A new cylinder head is included with all the necessary gaskets and fittings and a technical data sheet that tells you things like squish clearance and torque settings.
chn you scan the sheet or take picture
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