Blaster has low compression but runs

BlasterAdam

BlasterAdam

Member
Apr 13, 2021
11
0
32
26
Hey guys so I’m new in the forum but I have used a lot of information from them to fix my blaster. So I just got it back from a shop with a new clutch case and gaskets and seals. I also had a new clutch installed. But, the guy said that it had lower compression than normal- about 100 psi when it should be 120. The bike runs and rides and has pretty good power. Do u think I need new rings and piston? Or should I just ride in hopes of the best. I dropped a video below of it running, see if you notice any issues- it has a bit of knocking but I did some research and saw that all of these have some.

edit- I do not know how to put videos on this lol
 
It will be time for a topend rebuild soon.
100 is low. You will have lower power with lower compression.
Refreshing the topend on 2 strokes is part of maintenance.
 
Slydog said:
It will be time for a topend rebuild soon.
100 is low. You will have lower power with lower compression.
Refreshing the topend on 2 strokes is part of maintenance.
Click to expand...

alright, and what are you thinking? piston, rings? and do you think I'll be fine to ride it for the time being?
 
Start. With fresh bore and piston. That way all clearancing is correct.

As for riding? You may be ok? Or not?. But if you do have. Noticeable piston slap and a cast piston then be careful . the piston skirt does break off and can cause some serious damage. Forged pistons are definitely stronger. But cast is fine for some also as long as maintenance is done on time.
 
Slydog said:
Start. With fresh bore and piston. That way all clearancing is correct.

As for riding? You may be ok? Or not?. But if you do have. Noticeable piston slap and a cast piston then be careful . the piston skirt does break off and can cause some serious damage. Forged pistons are definitely stronger. But cast is fine for some also as long as maintenance is done on time.
Click to expand...

alright. you know any good kits on ebay? I know wiseco is good. Also, you think I could rebuild it? I've never really built one of these engines before, only little 80cc bikes lol. I don't have a bunch of moeny either, maybe $175?
 
I'm going to get a wiseco top end kit with piston and cylinder. Ill lyk if I have any issues.
 
Those cheap kits on egay are junk. And blow up more often than not.
Your best choice is ussualy boring your original oem cylinder.its a high quality piece.ask your local machine shop . they can measure what you have now as far as cylinder and piston clearance and go from there.

I know the cheap egay kits are tempting
but not worth the money
 
Slydog said:
Those cheap kits on egay are junk. And blow up more often than not.
Your best choice is ussualy boring your original oem cylinder.its a high quality piece.ask your local machine shop . they can measure what you have now as far as cylinder and piston clearance and go from there.

I know the cheap egay kits are tempting
but not worth the money
Click to expand...

the wiseco kits are supposed to be very good and the head is oem. It’s $250.
 
Good luck. Do acouple heat cycles. And retouqe head and cylinder before riding.good idea to do a leakdown test. After assembly to verify yoy have ni air leaks.check jetting with plug chops

Let r rip
 
Slydog said:
Good luck. Do acouple heat cycles. And retouqe head and cylinder before riding.good idea to do a leakdown test. After assembly to verify yoy have ni air leaks.check jetting with plug chops

Let r rip
Click to expand...
How do u do a leak down test?
 
You must log in or register to reply here.

Similar threads

Carter Prater
Compression
Replies
0
Views
70
Engine
Carter Prater
Carter Prater
D
I have spark, but blaster wont start
Replies
3
Views
203
Carburetor
RIDE-RED350r
RIDE-RED350r
blaster_4_ever
Grooved clutch basket?
Replies
1
Views
121
Engine
Tooloose
Tooloose
D
2003 blaster 200 Shifter Wont Spring Back
Replies
2
Views
547
Engine
Larry's Shee
L
Nathon
2005 blaster boggs and smokes
Replies
0
Views
86
Engine
Nathon
Nathon
Top Bottom
Back