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 Post subject: Hammerhead twister 90psi compression
PostPosted: Thu May 14, 2020 3:43 pm 
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Hello all, thanks for any help I may receive.

I have a hammerhead twister 150cc that wouldnt start, I checked the compression and found it to be at about 80, dropped some oil in the plug hole and it went up to 120, which pointed to the piston rings. I then order a whole new set of rings, piston, gasket and housing. Replaced everything, adjusted the valves to 004 intake and 005 exhaust. now My compression reads at 90psi at WOT. any help would be greatly appreciated.

Once again Thanks


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Thu May 14, 2020 5:28 pm 
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Did you set cam timing correctly?
Did you adjust the cam chain tension?
Did you gap the rings to the piston?
Did you offset the gaps when installing the rings?

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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Thu May 14, 2020 8:41 pm 
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cam is good
adjusted the tension
rings are gapped and offset


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 8:07 am 
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redid the whole thing with second piston and ring set and now up to about 95psi. it tries to start and i notice smoke coming out in between the cylinder and valve housing. new gasket there so i am still pretty lost. another thing i noticed is that I added about an ounce of oil in the spark plug socket and compression went up to 130psi again.


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 10:16 am 
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Location: Elburn Il.
Did you hone the cylinder so the rings could seat?

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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 10:20 am 
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Location: Elburn Il.
Also ,I dont use synthetic oil for the break in.

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Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS (went to good home)
Red and black Redline Riots


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 11:11 am 
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No I didnt, The cylinder is new and came with the piston, didnt think i needed to on a new cylinder/piston kit.


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 11:36 am 
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No you shouldn't. Torqued to spec? Do have acorn style head nuts? Sometimes they bottom out. Cracked head

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Karl



Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS (went to good home)
Red and black Redline Riots


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 11:37 am 
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Upside down rings

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Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS (went to good home)
Red and black Redline Riots


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 11:51 am 
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what do you mean upside down rings? i have the dark one in the middle and the lighter one on top.


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 11:53 am 
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No acorn style head nuts, tried 2 different heads same problem.


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 12:09 pm 
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On the rings they dots or numbers , they are facing up?

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Karl



Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS (went to good home)
Red and black Redline Riots


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 2:04 pm 
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damn didnt check that, guess its time to reopen her up


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 2:05 pm 
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should they be facing up?


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 3:15 pm 
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update: fixed one ring (the top one) which was facing down and now im up to about 110psi, but still wont start. it tries and backfires like crazy but wont completely turn over.


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 3:19 pm 
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Location: Elburn Il.
Does the slide in carb move freely up and down?

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Karl



Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS (went to good home)
Red and black Redline Riots


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 3:44 pm 
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yes, brand new carb, i got 3 of them here


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Fri May 15, 2020 4:10 pm 
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You might be a tooth off on your cam. Or maybe a sheared key on your fly wheel

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Karl



Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS (went to good home)
Red and black Redline Riots


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Sat May 16, 2020 8:41 am 
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update: replaced the new cdi and spark with old one and it turned right on. thanks for your help funnyman and PGH, much appreciated.


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 Post subject: Re: Hammerhead twister 90psi compression
PostPosted: Sat May 16, 2020 10:58 am 
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Glad you got it started but you should still have higher compression

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Karl



Blade DX 150*
* on the juice for sale
HH 250ss
Quiksilver sr 440(went to a good home)
Joyner 650 SS (went to good home)
Red and black Redline Riots


Top
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