Pocket Bike Engine Project
- Thread starter lowracer
- Start date
gera229,
I run v-belts (not chains) on both my pocketbike MB's so no teeth.
I have a 1.5" drive pulley & a 22.5" rim pulley with a 25" tire giving me a 15.6:1 final drive ratio (did rollout test to confirm this).
-Lowracer-
I run v-belts (not chains) on both my pocketbike MB's so no teeth.
I have a 1.5" drive pulley & a 22.5" rim pulley with a 25" tire giving me a 15.6:1 final drive ratio (did rollout test to confirm this).
-Lowracer-
The longer headbolts from McMaster Carr are part# 91303A168 (1 Pack Metric Blue Coated Socket Head Cap Screw, M6 Thread, 90mm Length, 1.00mm Pitch)...For those looking to get the longer bolts...I used a few lockwashers to take up some extra length since these are just a bit too long. Dont forget to use some red loctite on the threads...
-Lowracer-
-Lowracer-
What's the difference between a lockwasher and a normal washer?
Hey how do I order from McMaster? I tried to place an order, but it did not seem to lead me to a page to pay for my order. How much do they charge for shipping?
Low racing, zero on ebay does not ship out performance clutches with the cuts due to a lot of problems with them. Do you have the performance clutch? have you had any problems with it? Did your springs ever blow?
Hey how do I order from McMaster? I tried to place an order, but it did not seem to lead me to a page to pay for my order. How much do they charge for shipping?
Low racing, zero on ebay does not ship out performance clutches with the cuts due to a lot of problems with them. Do you have the performance clutch? have you had any problems with it? Did your springs ever blow?
gera
Most of my orders are $5. sh and sometimes less. One time part of the shipment came from another warehouse and was around $8. for that part of order. Told Them I was not a happy camper!! lol.
I`m in Pensacola Fl and most orders come from Atlanta Georga in 1-2 days. Many of my orders have been fairly heavy for bolts and nuts = 3-4 box`s.
Ron
Most of my orders are $5. sh and sometimes less. One time part of the shipment came from another warehouse and was around $8. for that part of order. Told Them I was not a happy camper!! lol.
I`m in Pensacola Fl and most orders come from Atlanta Georga in 1-2 days. Many of my orders have been fairly heavy for bolts and nuts = 3-4 box`s.
Ron
Gera,
The Stage 2 kit comes with the performance clutch.
I have 2 of those engines & neither has given me any troubles...
-Lowracer-
The Stage 2 kit comes with the performance clutch.
I have 2 of those engines & neither has given me any troubles...
-Lowracer-
I believe the piston is the same 44mm for all these cag stage engines.
Compared to stock, the compression is higher, better piston & crank & connecting rod & the performance carb really works well.
The performance clutch works well too.
For the extra $50...its all worth it
-Lowracer-
Compared to stock, the compression is higher, better piston & crank & connecting rod & the performance carb really works well.
The performance clutch works well too.
For the extra $50...its all worth it
-Lowracer-
Gera,
Yeah, its not the cc's.
MB's in most States where MB's are legal need to be at or under 50cc's.
These pocket bike engines are so tiny they look low cc's but run out strong.
I run 32:1 Yamalube 2R mixed with 91 octane no-ethanol premium unleaded.
-Lowracer-
Yeah, its not the cc's.
MB's in most States where MB's are legal need to be at or under 50cc's.
These pocket bike engines are so tiny they look low cc's but run out strong.
I run 32:1 Yamalube 2R mixed with 91 octane no-ethanol premium unleaded.
-Lowracer-
Ok,
If you put a stage 2 on a 49cc it will be 51cc, if you put it on a 47cc will it also be 51cc?
So engine is all the same everything is the same, but the cylinder is the only thing that makes the difference right?
I will order my engine today and buy longer head studs, no other bolts are needed right?
I asked dax about his GT50R and he says he uses 95mm head studs, I have no clue how, but as you said they will not fit so I won't get them. It's weird, is Dax's motor different or something? I said stage 2, maybe he mistakened for the stage 3 kit which I believe probably needs even longer head studs.
Thanks.
If you put a stage 2 on a 49cc it will be 51cc, if you put it on a 47cc will it also be 51cc?
So engine is all the same everything is the same, but the cylinder is the only thing that makes the difference right?
I will order my engine today and buy longer head studs, no other bolts are needed right?
I asked dax about his GT50R and he says he uses 95mm head studs, I have no clue how, but as you said they will not fit so I won't get them. It's weird, is Dax's motor different or something? I said stage 2, maybe he mistakened for the stage 3 kit which I believe probably needs even longer head studs.
Thanks.
Gera229,
The stock bolts are 80mm & I couldnt find 85mm, so I bought the 90mm & use a few split lock washers under each socket cap to eat up the few millimeters that make the 90mm's too long. 95's would be way too long (I'll bet Dax just made an error saying 95mm's).
Best thing for you to do is to get an engine & then do your own measuring. Then research the suppliers who sell hardware & pocket bike parts. That way you'll know that the info you receive is correct...
-Lowracer-
The stock bolts are 80mm & I couldnt find 85mm, so I bought the 90mm & use a few split lock washers under each socket cap to eat up the few millimeters that make the 90mm's too long. 95's would be way too long (I'll bet Dax just made an error saying 95mm's).
Best thing for you to do is to get an engine & then do your own measuring. Then research the suppliers who sell hardware & pocket bike parts. That way you'll know that the info you receive is correct...
-Lowracer-
Gera,
See post #95 in this thread.
Its kinda a earthy tone reddish color (definitely not gray)
-Lowracer-
See post #95 in this thread.
Its kinda a earthy tone reddish color (definitely not gray)
-Lowracer-
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Hey what's the dome size on these? Is it 13:1 (91 premium unleaded fuel)? Or is it 15:1 (105 unleaded fuel)? Where can I get 105 fuel? What fuel do you use?
Is there any way to change the dome? Will I have to change the entire head?
Also to test your max speed did you use a GPS (very accurate)? 50mph is fast.
Is there any way to change the dome? Will I have to change the entire head?
Also to test your max speed did you use a GPS (very accurate)? 50mph is fast.
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Its not 105 octane.
I use 91 octane no-ethanol premium unleaded mixed @ 32:1 w/Yamalube 2R
Wife clocked me in her car, but then I bought an RPM meter to verify the speed doing the math. It is fast, but feels less fast on the DH full suspension MTB than it does on the no-suspension bike that I have the same engine on (on that bike it feels like 100...lol) These little engines are surprisingly powerful especially for a bicycle application.
-Lowracer-
I use 91 octane no-ethanol premium unleaded mixed @ 32:1 w/Yamalube 2R
Wife clocked me in her car, but then I bought an RPM meter to verify the speed doing the math. It is fast, but feels less fast on the DH full suspension MTB than it does on the no-suspension bike that I have the same engine on (on that bike it feels like 100...lol) These little engines are surprisingly powerful especially for a bicycle application.
-Lowracer-
I use 91 octane gas & it runs great.
(In other words, I have no idea about the dome size...)
-Lowracer-
(In other words, I have no idea about the dome size...)
-Lowracer-
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